Read-Only devices, multipath and more

Hi,

I'll try to summarize the facts about how linux kernel (scsi and device-mapper) and userspace (multipath-tools) handles devices RO->RW->RO changes.

The sample setup is 2 x EMC Symmetrix systems, with a pair of logical unit configured for synchronous inter-system replication (SRDF). In a normal situation, the LU receiving the data updates (the R2) is RO, while the LU emitting the data updates (the R1) is RW. Let's take this state as a starting point.

Server S1 sees R1. Server S2 sees R2

---

t0)
storage state: R1 (RW) <- sync -> R2 (RO)
action: Linux system on S2 freshly rebooted.
fact: scsi paths to R2 are reported read-only by "hdparm -r"
fact: device-mapper refuse to load a RW multipath table on these paths (ie without libdevmapper:set_task_set_ro())

question: should change this behaviour to allow to load a RW multipath table on these paths and let the IO be failed by the storage hardware ?

t1)
storage state: R1 (RW) <- split -> R2 (RW)
action: none
fact: scsi paths to R2 are still reported read-only by "hdparm -r"
fact: device-mapper still refuse to load a RW multipath table on these paths
fact: if a RO multipath table was loaded at t0, it is still RO at t1

question: shouldn't the write protection change be detected by the scsi kernel subsystem, or should we implement a userspace device polling ?
question: how do we detect from userspace the device write protection change ? (trying to load a multipath devmap is not a good test). sg-utils maybe ? in multipathd or in a separe daemon, as the issue extends beyond multipathing ?

action: echo 1>/sys/block/sd{a,b}/device/rescan
fact: the write protection flags are updated to the correct RW state and multipath then works as expected

question: is there a softer way to update the write proctection flags ?

t2)
storage state: R1 (RW) <- resync -> R2 (RO)
action: none
fact: the RW multipath devmap is still loaded

question: so why not permit to load it in the first place ?

---

This scenario shows there is an annoying lack of consistency and symmetry in the Linux behaviour. I'm willing to implement whatever is expected from the multipath-tools. But can we define what is expected ?

Alasdair proposed to add more explicit table loading ioctl return code when the failure is due to this ready-only paths issue (E_ROFS for example). Which comes short of solving the RO->RW devmap promotion

Please advise.
Christophe Varoqui (keep me on cc:)

My RedHat 5.1 ES server (actually it is that but rebranded as Oracles latest Linux) is logging this in /var/log/message all the time.

It is attached to a Hitachi SAN device.

All seems to be working OK, but these errors go on and on.

Don't get what they mean?

May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 65:0
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 65:16
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 65:32
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 65:48
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 65:64
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 65:80
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 8:0
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 8:16
May 16 19:48:01 wpe01 multipathd: error calling out
mpath_prio_hds_modular 8:32
May 16 19:48:01 wpe01 multipathd: error calling out

mpath_prio_hds_modular 8:48

Craig

The multipathd tried calling mpath_prio_hds_modular program but it could not find it! There is a bug in some version of RHEL where multipath has "mpath_prio_hds_modular" instead of "/sbin/mpath_prio_hds_modular". Update your multipath tools package or fix it in your /etc/multipath.conf (this requires some careful modifications!)

--Malahal.
PS: since execv looks for your executable file in the 'cwd', you can probably make it work by just copying /sbin/mpath_prio_hds_modular to /mpath_prio_hds_modular (I am assuming that multipathd daemon makes "/" as it ***home*** before calling this.)

I put a symlink in /
ln -s /sbin/mpath_prio_hds_modular mpath_prio_hds_modular

But it still has the error.

Where would I edit my /etc/multipath.conf to set this?

Thanks!
Craig

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Friday, May 16, 2008 2:02 PM
To: [email protected]
Subject: Re: [dm-devel] multipathd: error calling out mpath_prio_hds_modular

The multipathd tried calling mpath_prio_hds_modular program but it could not find it! There is a bug in some version of RHEL where multipath has "mpath_prio_hds_modular" instead of "/sbin/mpath_prio_hds_modular". Update your multipath tools package or fix it in your /etc/multipath.conf (this requires some careful modifications!)

--Malahal.
PS: since execv looks for your executable file in the 'cwd', you can probably make it work by just copying /sbin/mpath_prio_hds_modular to /mpath_prio_hds_modular (I am assuming that multipathd daemon makes "/" as it ***home*** before calling this.)

--
dm-devel mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/dm-devel

The symlink didn't work, but coping the file to / worked.

YES!!!

Thank You!
Craig

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Craig Simpson
Sent: Friday, May 16, 2008 4:19 PM
To: device-mapper development
Subject: RE: [dm-devel] multipathd: error calling out mpath_prio_hds_modular

I put a symlink in /
ln -s /sbin/mpath_prio_hds_modular mpath_prio_hds_modular

But it still has the error.

Where would I edit my /etc/multipath.conf to set this?

Thanks!
Craig

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Friday, May 16, 2008 2:02 PM
To: [email protected]
Subject: Re: [dm-devel] multipathd: error calling out mpath_prio_hds_modular

The multipathd tried calling mpath_prio_hds_modular program but it could not find it! There is a bug in some version of RHEL where multipath has "mpath_prio_hds_modular" instead of "/sbin/mpath_prio_hds_modular". Update your multipath tools package or fix it in your /etc/multipath.conf (this requires some careful modifications!)

--Malahal.
PS: since execv looks for your executable file in the 'cwd', you can probably make it work by just copying /sbin/mpath_prio_hds_modular to /mpath_prio_hds_modular (I am assuming that multipathd daemon makes "/" as it ***home*** before calling this.)

--
dm-devel mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/dm-devel

--
dm-devel mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/dm-devel

That is very odd! symlink or hardlink or a real copy of the program should not make any difference as far as the execv() goes.

My multipathing seems to be working. As seen below.

multipathd -k
multipathd> show multipaths status

name    failback  queueing paths dm-st
mpath0  immediate off      4     active
asm01   immediate off      4     active
asm02   immediate off      4     active
asm03   immediate off      4     active
asm04   immediate off      4     active
asm05   immediate off      4     active
asm06   immediate off      4     active
asm07   immediate off      4     active
asm08   immediate off      4     active
asm09   immediate off      4     active
asm10   immediate off      4     active
mpath11 immediate off      4     active
mpath12 immediate off      4     active
mpath13 immediate off      4     active
mpath14 immediate off      4     active
mpath15 immediate off      4     active
mpath16 immediate off      4     active
mpath17 immediate off      4     active
mpath18 immediate off      4     active
mpath19 immediate off      4     active
mpath20 immediate off      4     active
ocr1    immediate off      4     active
ocr2    immediate off      4     active
vote1   immediate off      4     active
vote2   immediate off      4     active
vote3   immediate off      4     active
mpath26 immediate off      4     active

BUT I am getting this error:

I don't get the "[undef] [ready] [orphan]" part. It seems that I have 4 paths and all is good.

multipathd> show paths

hcil     dev  dev_t   pri dm_st   chk_st  next_check
0:0:0:26 sdaa 65:160  0   [active][ready] XXXXXXXXX. 38/40
0:0:0:27 sdab 65:176  1   [undef] [ready] [orphan]
0:0:0:28 sdac 65:192  0   [undef] [ready] [orphan]
0:0:0:29 sdad 65:208  1   [undef] [ready] [orphan]
0:0:0:30 sdae 65:224  0   [undef] [ready] [orphan]
0:0:0:31 sdaf 65:240  1   [undef] [ready] [orphan]
0:0:0:32 sdag 66:0    0   [undef] [ready] [orphan]
0:0:0:33 sdah 66:16   1   [undef] [ready] [orphan]
0:0:0:34 sdai 66:32   0   [undef] [ready] [orphan]
0:0:0:35 sdaj 66:48   1   [undef] [ready] [orphan]
0:0:0:36 sdak 66:64   0   [undef] [ready] [orphan]
0:0:0:37 sdal 66:80   1   [undef] [ready] [orphan]
0:0:0:38 sdam 66:96   0   [undef] [ready] [orphan]
0:0:0:39 sdan 66:112  1   [undef] [ready] [orphan]
0:0:1:0  sdao 66:128  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:1  sdap 66:144  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:2  sdaq 66:160  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:3  sdar 66:176  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:4  sdas 66:192  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:5  sdat 66:208  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:6  sdau 66:224  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:7  sdav 66:240  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:8  sdaw 67:0    1   [active][ready] XXXXXXXXX. 38/40
0:0:1:9  sdax 67:16   0   [active][ready] XXXXXXXXX. 38/40
0:0:1:10 sday 67:32   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:11 sdaz 67:48   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:0  sda  8:0     0   [active][ready] XXXXXXXXX. 38/40
0:0:1:12 sdba 67:64   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:13 sdbb 67:80   0   [active][ready] XXXXXXXXX. 38/40
0:0:1:14 sdbc 67:96   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:15 sdbd 67:112  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:16 sdbe 67:128  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:17 sdbf 67:144  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:18 sdbg 67:160  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:19 sdbh 67:176  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:20 sdbi 67:192  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:21 sdbj 67:208  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:22 sdbk 67:224  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:23 sdbl 67:240  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:24 sdbm 68:0    1   [active][ready] XXXXXXXXX. 38/40
0:0:1:25 sdbn 68:16   0   [active][ready] XXXXXXXXX. 38/40
0:0:1:26 sdbo 68:32   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:27 sdbp 68:48   0   [undef] [ready] [orphan]
0:0:1:28 sdbq 68:64   1   [undef] [ready] [orphan]
0:0:1:29 sdbr 68:80   0   [undef] [ready] [orphan]
0:0:1:30 sdbs 68:96   1   [undef] [ready] [orphan]
0:0:1:31 sdbt 68:112  0   [undef] [ready] [orphan]
0:0:1:32 sdbu 68:128  1   [undef] [ready] [orphan]
0:0:1:33 sdbv 68:144  0   [undef] [ready] [orphan]
0:0:1:34 sdbw 68:160  1   [undef] [ready] [orphan]
0:0:1:35 sdbx 68:176  0   [undef] [ready] [orphan]
0:0:1:36 sdby 68:192  1   [undef] [ready] [orphan]
0:0:1:37 sdbz 68:208  0   [undef] [ready] [orphan]
0:0:0:1  sdb  8:16    1   [active][ready] XXXXXXXXX. 38/40
0:0:1:38 sdca 68:224  1   [undef] [ready] [orphan]
0:0:1:39 sdcb 68:240  0   [undef] [ready] [orphan]
1:0:0:0  sdch 69:80   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:1  sdci 69:96   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:2  sdcj 69:112  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:3  sdck 69:128  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:4  sdcl 69:144  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:5  sdcm 69:160  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:6  sdcn 69:176  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:7  sdco 69:192  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:8  sdcp 69:208  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:9  sdcq 69:224  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:10 sdcr 69:240  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:11 sdcs 70:0    1   [active][ready] XXXXXXXXX. 38/40
1:0:0:12 sdct 70:16   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:13 sdcu 70:32   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:14 sdcv 70:48   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:15 sdcw 70:64   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:16 sdcx 70:80   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:17 sdcy 70:96   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:18 sdcz 70:112  0   [active][ready] XXXXXXXXX. 38/40
0:0:0:2  sdc  8:32    0   [active][ready] XXXXXXXXX. 38/40
1:0:0:19 sdda 70:128  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:20 sddb 70:144  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:21 sddc 70:160  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:22 sddd 70:176  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:23 sdde 70:192  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:24 sddf 70:208  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:25 sddg 70:224  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:26 sddh 70:240  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:27 sddi 71:0    1   [undef] [ready] [orphan]
1:0:0:28 sddj 71:16   0   [undef] [ready] [orphan]
1:0:0:29 sddk 71:32   1   [undef] [ready] [orphan]
1:0:0:30 sddl 71:48   0   [undef] [ready] [orphan]
1:0:0:31 sddm 71:64   1   [undef] [ready] [orphan]
1:0:0:32 sddn 71:80   0   [undef] [ready] [orphan]
1:0:0:33 sddo 71:96   1   [undef] [ready] [orphan]
1:0:0:34 sddp 71:112  0   [undef] [ready] [orphan]
1:0:0:35 sddq 71:128  1   [undef] [ready] [orphan]
1:0:0:36 sddr 71:144  0   [undef] [ready] [orphan]
1:0:0:37 sdds 71:160  1   [undef] [ready] [orphan]
1:0:0:38 sddt 71:176  0   [undef] [ready] [orphan]
1:0:0:39 sddu 71:192  1   [undef] [ready] [orphan]
1:0:1:0  sddv 71:208  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:1  sddw 71:224  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:2  sddx 71:240  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:3  sddy 128:0   0   [active][ready] XXXXXXXXX. 38/40
1:0:1:4  sddz 128:16  1   [active][ready] XXXXXXXXX. 38/40
0:0:0:3  sdd  8:48    1   [active][ready] XXXXXXXXX. 38/40
1:0:1:5  sdea 128:32  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:6  sdeb 128:48  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:7  sdec 128:64  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:8  sded 128:80  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:9  sdee 128:96  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:10 sdef 128:112 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:11 sdeg 128:128 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:12 sdeh 128:144 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:13 sdei 128:160 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:14 sdej 128:176 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:15 sdek 128:192 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:16 sdel 128:208 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:17 sdem 128:224 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:18 sden 128:240 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:19 sdeo 129:0   0   [active][ready] XXXXXXXXX. 38/40
1:0:1:20 sdep 129:16  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:21 sdeq 129:32  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:22 sder 129:48  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:23 sdes 129:64  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:24 sdet 129:80  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:25 sdeu 129:96  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:26 sdev 129:112 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:27 sdew 129:128 0   [undef] [ready] [orphan]
1:0:1:28 sdex 129:144 1   [undef] [ready] [orphan]
1:0:1:29 sdey 129:160 0   [undef] [ready] [orphan]
1:0:1:30 sdez 129:176 1   [undef] [ready] [orphan]
0:0:0:4  sde  8:64    0   [active][ready] XXXXXXXXX. 38/40
1:0:1:31 sdfa 129:192 0   [undef] [ready] [orphan]
1:0:1:32 sdfb 129:208 1   [undef] [ready] [orphan]
1:0:1:33 sdfc 129:224 0   [undef] [ready] [orphan]
1:0:1:34 sdfd 129:240 1   [undef] [ready] [orphan]
1:0:1:35 sdfe 130:0   0   [undef] [ready] [orphan]
1:0:1:36 sdff 130:16  1   [undef] [ready] [orphan]
1:0:1:37 sdfg 130:32  0   [undef] [ready] [orphan]
1:0:1:38 sdfh 130:48  1   [undef] [ready] [orphan]
1:0:1:39 sdfi 130:64  0   [undef] [ready] [orphan]
0:0:0:5  sdf  8:80    1   [active][ready] XXXXXXXXX. 38/40
0:0:0:6  sdg  8:96    0   [active][ready] XXXXXXXXX. 38/40
0:0:0:7  sdh  8:112   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:8  sdi  8:128   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:9  sdj  8:144   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:10 sdk  8:160   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:11 sdl  8:176   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:12 sdm  8:192   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:13 sdn  8:208   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:14 sdo  8:224   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:15 sdp  8:240   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:16 sdq  65:0    0   [active][ready] XXXXXXXXX. 38/40
0:0:0:17 sdr  65:16   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:18 sds  65:32   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:19 sdt  65:48   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:20 sdu  65:64   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:21 sdv  65:80   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:22 sdw  65:96   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:23 sdx  65:112  1   [active][ready] XXXXXXXXX. 38/40
0:0:0:24 sdy  65:128  0   [active][ready] XXXXXXXXX. 38/40
0:0:0:25 sdz  65:144  1   [active][ready] XXXXXXXXX. 38/40

--

Craig Simpson

"In the circle the beginning and the end are common"
~ Heraclitis (540-480BC)

Also if I do a multipath -l all looks good?

[root@oralnx01 sbin]# multipath -l
asm09 (1HITACHI_730600240008) dm-15 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:8  sdaw 67:0    [active][undef]
 \_ 1:0:0:8  sdcp 69:208  [active][undef]
 \_ 1:0:1:8  sded 128:80  [active][undef]
 \_ 0:0:0:8  sdi  8:128   [active][undef]

mpath19 (1HITACHI_730600240018) dm-34 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 0:0:1:18 sdbg 67:160 [active][undef]
\_ 1:0:1:18 sden 128:240 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:18 sdcz 70:112 [active][undef]
\_ 0:0:0:18 sds 65:32 [active][undef]
mpath0 (1HITACHI_730600240026) dm-6 HITACHI,DF600F [size=15G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 0:0:1:26 sdbo 68:32 [active][undef]
\_ 1:0:1:26 sdev 129:112 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:0:26 sdaa 65:160 [active][undef]
\_ 1:0:0:26 sddh 70:240 [active][undef]
vote3 (1HITACHI_730600240024) dm-43 HITACHI,DF600F [size=1.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:24 sdbm 68:0    [active][undef]
 \_ 1:0:0:24 sddf 70:208  [active][undef]
 \_ 1:0:1:24 sdet 129:80  [active][undef]
 \_ 0:0:0:24 sdy  65:128  [active][undef]
asm08 (1HITACHI_730600240007) dm-14 HITACHI,DF600F
[size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:1:7  sdav 66:240  [active][undef]
 \_ 1:0:0:7  sdco 69:192  [active][undef]
 \_ 1:0:1:7  sdec 128:64  [active][undef]
 \_ 0:0:0:7  sdh  8:112   [active][undef]
asm10 (1HITACHI_730600240009) dm-23 HITACHI,DF600F
[size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:1:9  sdax 67:16   [active][undef]
 \_ 1:0:0:9  sdcq 69:224  [active][undef]
 \_ 1:0:1:9  sdee 128:96  [active][undef]
 \_ 0:0:0:9  sdj  8:144   [active][undef]

mpath18 (1HITACHI_730600240017) dm-33 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 1:0:0:17 sdcy 70:96 [active][undef]
\_ 0:0:0:17 sdr 65:16 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:1:17 sdbf 67:144 [active][undef]
\_ 1:0:1:17 sdem 128:224 [active][undef]
vote2 (1HITACHI_730600240023) dm-42 HITACHI,DF600F [size=1.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:23 sdbl 67:240  [active][undef]
 \_ 1:0:0:23 sdde 70:192  [active][undef]
 \_ 1:0:1:23 sdes 129:64  [active][undef]
 \_ 0:0:0:23 sdx  65:112  [active][undef]
ocr2 (1HITACHI_730600240021) dm-37 HITACHI,DF600F
[size=1.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:1:21 sdbj 67:208  [active][undef]
 \_ 1:0:0:21 sddc 70:160  [active][undef]
 \_ 1:0:1:21 sdeq 129:32  [active][undef]
 \_ 0:0:0:21 sdv  65:80   [active][undef]

mpath20 (1HITACHI_730600240019) dm-35 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 1:0:0:19 sdda 70:128 [active][undef]
\_ 0:0:0:19 sdt 65:48 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:1:19 sdbh 67:176 [active][undef]
\_ 1:0:1:19 sdeo 129:0 [active][undef]
asm07 (1HITACHI_730600240006) dm-13 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:6  sdau 66:224  [active][undef]
 \_ 1:0:0:6  sdcn 69:176  [active][undef]
 \_ 1:0:1:6  sdeb 128:48  [active][undef]
 \_ 0:0:0:6  sdg  8:96    [active][undef]

mpath17 (1HITACHI_730600240016) dm-32 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 0:0:1:16 sdbe 67:128 [active][undef]
\_ 1:0:1:16 sdel 128:208 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:16 sdcx 70:80 [active][undef]
\_ 0:0:0:16 sdq 65:0 [active][undef]
vote1 (1HITACHI_730600240022) dm-39 HITACHI,DF600F [size=1.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:22 sdbk 67:224  [active][undef]
 \_ 1:0:0:22 sddd 70:176  [active][undef]
 \_ 1:0:1:22 sder 129:48  [active][undef]
 \_ 0:0:0:22 sdw  65:96   [active][undef]
ocr1 (1HITACHI_730600240020) dm-36 HITACHI,DF600F
[size=1.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:1:20 sdbi 67:192  [active][undef]
 \_ 1:0:0:20 sddb 70:144  [active][undef]
 \_ 1:0:1:20 sdep 129:16  [active][undef]
 \_ 0:0:0:20 sdu  65:64   [active][undef]
asm06 (1HITACHI_730600240005) dm-12 HITACHI,DF600F
[size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
 \_ 0:0:1:5  sdat 66:208  [active][undef]
 \_ 1:0:0:5  sdcm 69:160  [active][undef]
 \_ 1:0:1:5  sdea 128:32  [active][undef]
 \_ 0:0:0:5  sdf  8:80    [active][undef]

mpath16 (1HITACHI_730600240015) dm-31 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 1:0:0:15 sdcw 70:64 [active][undef]
\_ 0:0:0:15 sdp 8:240 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:1:15 sdbd 67:112 [active][undef]
\_ 1:0:1:15 sdek 128:192 [active][undef]
asm05 (1HITACHI_730600240004) dm-11 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:4  sdas 66:192  [active][undef]
 \_ 1:0:0:4  sdcl 69:144  [active][undef]
 \_ 1:0:1:4  sddz 128:16  [active][undef]
 \_ 0:0:0:4  sde  8:64    [active][undef]

mpath15 (1HITACHI_730600240014) dm-30 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 0:0:1:14 sdbc 67:96 [active][undef]
\_ 1:0:1:14 sdej 128:176 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:14 sdcv 70:48 [active][undef]
\_ 0:0:0:14 sdo 8:224 [active][undef]
asm04 (1HITACHI_730600240003) dm-10 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:3  sdar 66:176  [active][undef]
 \_ 1:0:0:3  sdck 69:128  [active][undef]
 \_ 1:0:1:3  sddy 128:0   [active][undef]
 \_ 0:0:0:3  sdd  8:48    [active][undef]

mpath14 (1HITACHI_730600240013) dm-29 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 1:0:0:13 sdcu 70:32 [active][undef]
\_ 0:0:0:13 sdn 8:208 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:1:13 sdbb 67:80 [active][undef]
\_ 1:0:1:13 sdei 128:160 [active][undef]
asm03 (1HITACHI_730600240002) dm-9 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:2  sdaq 66:160  [active][undef]
 \_ 1:0:0:2  sdcj 69:112  [active][undef]
 \_ 0:0:0:2  sdc  8:32    [active][undef]
 \_ 1:0:1:2  sddx 71:240  [active][undef]

mpath13 (1HITACHI_730600240012) dm-28 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 0:0:1:12 sdba 67:64 [active][undef]
\_ 1:0:1:12 sdeh 128:144 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:12 sdct 70:16 [active][undef]
\_ 0:0:0:12 sdm 8:192 [active][undef]
asm02 (1HITACHI_730600240001) dm-8 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:1  sdap 66:144  [active][undef]
 \_ 0:0:0:1  sdb  8:16    [active][undef]
 \_ 1:0:0:1  sdci 69:96   [active][undef]
 \_ 1:0:1:1  sddw 71:224  [active][undef]

mpath12 (1HITACHI_730600240011) dm-27 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 1:0:0:11 sdcs 70:0 [active][undef]
\_ 0:0:0:11 sdl 8:176 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:1:11 sdaz 67:48 [active][undef]
\_ 1:0:1:11 sdeg 128:128 [active][undef]
asm01 (1HITACHI_730600240000) dm-7 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]

 \_ 0:0:1:0  sdao 66:128  [active][undef]
 \_ 0:0:0:0  sda  8:0     [active][undef]
 \_ 1:0:0:0  sdch 69:80   [active][undef]
 \_ 1:0:1:0  sddv 71:208  [active][undef]

mpath26 (1HITACHI_730600240025) dm-45 HITACHI,DF600F [size=15G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 1:0:0:25 sddg 70:224 [active][undef]
\_ 0:0:0:25 sdz 65:144 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:1:25 sdbn 68:16 [active][undef]
\_ 1:0:1:25 sdeu 129:96 [active][undef]
mpath11 (1HITACHI_730600240010) dm-25 HITACHI,DF600F [size=64G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
\_ 0:0:1:10 sday 67:32 [active][undef]
\_ 1:0:1:10 sdef 128:112 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:10 sdcr 69:240 [active][undef]
\_ 0:0:0:10 sdk 8:160 [active][undef]

--

Craig Simpson

"In the circle the beginning and the end are common"
~ Heraclitis (540-480BC)

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Craig Simpson
Sent: Monday, May 19, 2008 3:02 PM
To: device-mapper development
Subject: [dm-devel] "[undef] [ready] [orphan]" ?

My multipathing seems to be working. As seen below.

multipathd -k
multipathd> show multipaths status

name    failback  queueing paths dm-st
mpath0  immediate off      4     active
asm01   immediate off      4     active
asm02   immediate off      4     active
asm03   immediate off      4     active
asm04   immediate off      4     active
asm05   immediate off      4     active
asm06   immediate off      4     active
asm07   immediate off      4     active
asm08   immediate off      4     active
asm09   immediate off      4     active
asm10   immediate off      4     active
mpath11 immediate off      4     active
mpath12 immediate off      4     active
mpath13 immediate off      4     active
mpath14 immediate off      4     active
mpath15 immediate off      4     active
mpath16 immediate off      4     active
mpath17 immediate off      4     active
mpath18 immediate off      4     active
mpath19 immediate off      4     active
mpath20 immediate off      4     active
ocr1    immediate off      4     active
ocr2    immediate off      4     active
vote1   immediate off      4     active
vote2   immediate off      4     active
vote3   immediate off      4     active
mpath26 immediate off      4     active

BUT I am getting this error:

I don't get the "[undef] [ready] [orphan]" part. It seems that I have 4 paths and all is good.

multipathd> show paths

hcil     dev  dev_t   pri dm_st   chk_st  next_check
0:0:0:26 sdaa 65:160  0   [active][ready] XXXXXXXXX. 38/40
0:0:0:27 sdab 65:176  1   [undef] [ready] [orphan]
0:0:0:28 sdac 65:192  0   [undef] [ready] [orphan]
0:0:0:29 sdad 65:208  1   [undef] [ready] [orphan]
0:0:0:30 sdae 65:224  0   [undef] [ready] [orphan]
0:0:0:31 sdaf 65:240  1   [undef] [ready] [orphan]
0:0:0:32 sdag 66:0    0   [undef] [ready] [orphan]
0:0:0:33 sdah 66:16   1   [undef] [ready] [orphan]
0:0:0:34 sdai 66:32   0   [undef] [ready] [orphan]
0:0:0:35 sdaj 66:48   1   [undef] [ready] [orphan]
0:0:0:36 sdak 66:64   0   [undef] [ready] [orphan]
0:0:0:37 sdal 66:80   1   [undef] [ready] [orphan]
0:0:0:38 sdam 66:96   0   [undef] [ready] [orphan]
0:0:0:39 sdan 66:112  1   [undef] [ready] [orphan]
0:0:1:0  sdao 66:128  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:1  sdap 66:144  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:2  sdaq 66:160  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:3  sdar 66:176  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:4  sdas 66:192  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:5  sdat 66:208  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:6  sdau 66:224  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:7  sdav 66:240  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:8  sdaw 67:0    1   [active][ready] XXXXXXXXX. 38/40
0:0:1:9  sdax 67:16   0   [active][ready] XXXXXXXXX. 38/40
0:0:1:10 sday 67:32   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:11 sdaz 67:48   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:0  sda  8:0     0   [active][ready] XXXXXXXXX. 38/40
0:0:1:12 sdba 67:64   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:13 sdbb 67:80   0   [active][ready] XXXXXXXXX. 38/40
0:0:1:14 sdbc 67:96   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:15 sdbd 67:112  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:16 sdbe 67:128  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:17 sdbf 67:144  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:18 sdbg 67:160  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:19 sdbh 67:176  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:20 sdbi 67:192  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:21 sdbj 67:208  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:22 sdbk 67:224  1   [active][ready] XXXXXXXXX. 38/40
0:0:1:23 sdbl 67:240  0   [active][ready] XXXXXXXXX. 38/40
0:0:1:24 sdbm 68:0    1   [active][ready] XXXXXXXXX. 38/40
0:0:1:25 sdbn 68:16   0   [active][ready] XXXXXXXXX. 38/40
0:0:1:26 sdbo 68:32   1   [active][ready] XXXXXXXXX. 38/40
0:0:1:27 sdbp 68:48   0   [undef] [ready] [orphan]
0:0:1:28 sdbq 68:64   1   [undef] [ready] [orphan]
0:0:1:29 sdbr 68:80   0   [undef] [ready] [orphan]
0:0:1:30 sdbs 68:96   1   [undef] [ready] [orphan]
0:0:1:31 sdbt 68:112  0   [undef] [ready] [orphan]
0:0:1:32 sdbu 68:128  1   [undef] [ready] [orphan]
0:0:1:33 sdbv 68:144  0   [undef] [ready] [orphan]
0:0:1:34 sdbw 68:160  1   [undef] [ready] [orphan]
0:0:1:35 sdbx 68:176  0   [undef] [ready] [orphan]
0:0:1:36 sdby 68:192  1   [undef] [ready] [orphan]
0:0:1:37 sdbz 68:208  0   [undef] [ready] [orphan]
0:0:0:1  sdb  8:16    1   [active][ready] XXXXXXXXX. 38/40
0:0:1:38 sdca 68:224  1   [undef] [ready] [orphan]
0:0:1:39 sdcb 68:240  0   [undef] [ready] [orphan]
1:0:0:0  sdch 69:80   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:1  sdci 69:96   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:2  sdcj 69:112  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:3  sdck 69:128  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:4  sdcl 69:144  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:5  sdcm 69:160  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:6  sdcn 69:176  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:7  sdco 69:192  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:8  sdcp 69:208  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:9  sdcq 69:224  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:10 sdcr 69:240  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:11 sdcs 70:0    1   [active][ready] XXXXXXXXX. 38/40
1:0:0:12 sdct 70:16   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:13 sdcu 70:32   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:14 sdcv 70:48   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:15 sdcw 70:64   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:16 sdcx 70:80   0   [active][ready] XXXXXXXXX. 38/40
1:0:0:17 sdcy 70:96   1   [active][ready] XXXXXXXXX. 38/40
1:0:0:18 sdcz 70:112  0   [active][ready] XXXXXXXXX. 38/40
0:0:0:2  sdc  8:32    0   [active][ready] XXXXXXXXX. 38/40
1:0:0:19 sdda 70:128  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:20 sddb 70:144  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:21 sddc 70:160  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:22 sddd 70:176  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:23 sdde 70:192  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:24 sddf 70:208  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:25 sddg 70:224  1   [active][ready] XXXXXXXXX. 38/40
1:0:0:26 sddh 70:240  0   [active][ready] XXXXXXXXX. 38/40
1:0:0:27 sddi 71:0    1   [undef] [ready] [orphan]
1:0:0:28 sddj 71:16   0   [undef] [ready] [orphan]
1:0:0:29 sddk 71:32   1   [undef] [ready] [orphan]
1:0:0:30 sddl 71:48   0   [undef] [ready] [orphan]
1:0:0:31 sddm 71:64   1   [undef] [ready] [orphan]
1:0:0:32 sddn 71:80   0   [undef] [ready] [orphan]
1:0:0:33 sddo 71:96   1   [undef] [ready] [orphan]
1:0:0:34 sddp 71:112  0   [undef] [ready] [orphan]
1:0:0:35 sddq 71:128  1   [undef] [ready] [orphan]
1:0:0:36 sddr 71:144  0   [undef] [ready] [orphan]
1:0:0:37 sdds 71:160  1   [undef] [ready] [orphan]
1:0:0:38 sddt 71:176  0   [undef] [ready] [orphan]
1:0:0:39 sddu 71:192  1   [undef] [ready] [orphan]
1:0:1:0  sddv 71:208  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:1  sddw 71:224  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:2  sddx 71:240  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:3  sddy 128:0   0   [active][ready] XXXXXXXXX. 38/40
1:0:1:4  sddz 128:16  1   [active][ready] XXXXXXXXX. 38/40
0:0:0:3  sdd  8:48    1   [active][ready] XXXXXXXXX. 38/40
1:0:1:5  sdea 128:32  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:6  sdeb 128:48  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:7  sdec 128:64  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:8  sded 128:80  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:9  sdee 128:96  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:10 sdef 128:112 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:11 sdeg 128:128 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:12 sdeh 128:144 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:13 sdei 128:160 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:14 sdej 128:176 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:15 sdek 128:192 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:16 sdel 128:208 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:17 sdem 128:224 0   [active][ready] XXXXXXXXX. 38/40
1:0:1:18 sden 128:240 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:19 sdeo 129:0   0   [active][ready] XXXXXXXXX. 38/40
1:0:1:20 sdep 129:16  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:21 sdeq 129:32  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:22 sder 129:48  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:23 sdes 129:64  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:24 sdet 129:80  1   [active][ready] XXXXXXXXX. 38/40
1:0:1:25 sdeu 129:96  0   [active][ready] XXXXXXXXX. 38/40
1:0:1:26 sdev 129:112 1   [active][ready] XXXXXXXXX. 38/40
1:0:1:27 sdew 129:128 0   [undef] [ready] [orphan]
1:0:1:28 sdex 129:144 1   [undef] [ready] [orphan]
1:0:1:29 sdey 129:160 0   [undef] [ready] [orphan]
1:0:1:30 sdez 129:176 1   [undef] [ready] [orphan]
0:0:0:4  sde  8:64    0   [active][ready] XXXXXXXXX. 38/40
1:0:1:31 sdfa 129:192 0   [undef] [ready] [orphan]
1:0:1:32 sdfb 129:208 1   [undef] [ready] [orphan]
1:0:1:33 sdfc 129:224 0   [undef] [ready] [orphan]
1:0:1:34 sdfd 129:240 1   [undef] [ready] [orphan]
1:0:1:35 sdfe 130:0   0   [undef] [ready] [orphan]
1:0:1:36 sdff 130:16  1   [undef] [ready] [orphan]
1:0:1:37 sdfg 130:32  0   [undef] [ready] [orphan]
1:0:1:38 sdfh 130:48  1   [undef] [ready] [orphan]
1:0:1:39 sdfi 130:64  0   [undef] [ready] [orphan]
0:0:0:5  sdf  8:80    1   [active][ready] XXXXXXXXX. 38/40
0:0:0:6  sdg  8:96    0   [active][ready] XXXXXXXXX. 38/40
0:0:0:7  sdh  8:112   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:8  sdi  8:128   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:9  sdj  8:144   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:10 sdk  8:160   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:11 sdl  8:176   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:12 sdm  8:192   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:13 sdn  8:208   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:14 sdo  8:224   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:15 sdp  8:240   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:16 sdq  65:0    0   [active][ready] XXXXXXXXX. 38/40
0:0:0:17 sdr  65:16   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:18 sds  65:32   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:19 sdt  65:48   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:20 sdu  65:64   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:21 sdv  65:80   1   [active][ready] XXXXXXXXX. 38/40
0:0:0:22 sdw  65:96   0   [active][ready] XXXXXXXXX. 38/40
0:0:0:23 sdx  65:112  1   [active][ready] XXXXXXXXX. 38/40
0:0:0:24 sdy  65:128  0   [active][ready] XXXXXXXXX. 38/40
0:0:0:25 sdz  65:144  1   [active][ready] XXXXXXXXX. 38/40

--

Craig Simpson

"In the circle the beginning and the end are common"
~ Heraclitis (540-480BC)

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Yes. But relax this *only* for multipath targets, where the whole idea is to "hide" path problems from the layer above. It would not make sense in my view to do this for other DM targets.

I think this should be done too (for non-multipath and other errors).

Alasdair

[email protected]


Fair enough.

During my testing I remember seeing a RW linear map loaded over a RO multipath map (through a genuine vgchange -ay, the PV being the multipath).

Right, I'm about the publish a changeset for supporting the whole RO notion in the multipath-tools :
1/ printing the RO/RW information
2/ fallbacking to RO when RW loading fails
3/ new flag to force map reloading, which takes care of the RO->RW promotion and RW->RO demotion scenarii

I'll adapt 2/ to your new return codes when available.

Thanks for caring,
cvaroqui

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