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removing a single device?

DISCUSSION Douglas Gilbert 3 participants 4 messages May 9, 2003 – Jul 2, 2003

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Douglas Gilbert

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Quoted 9 lines · Robert L. Harris

A long time ago I used to be able to do:

echo "scsi add-single-device 0 0 11 0" > /proc/scsi/scsi echo "scsi remove-single-device 0 0 11 0" > /proc/scsi/scsi

When I wanted to unplug a SCA scsi drive for replacement. I tried this recently on my 2.4.20 kernel and nothing happened. No errors, no change to /proc/scsi/scsi, no entry in dmsg, it just ignored it. Has this been deprecated for a new way of removing hotswap drives?

Robert,
It is not deprecated (and is still present in the lk 2.5 development series since we still have no other way of doing this from the user space).

The parsing of that expression is very rigid: no tabs or redundant spaces.

Doug Gilbert

#1 lore raw

Does it work on scsi-emulation devices such as 3Ware raid controllers?

I'm trying to swap out a failed IDE drive on a 3Ware card. I went into tw_cli and executed "maint remove c1 p1" and it shows the drive offline. The disk is in what appears to be a hot-swap connection similar to SCA. Do I need to do the line below to remove it since the 3ware card registers the drive offline?

[email protected]:~# tw_cli info c1 p1
Controller 1, Port  1
----------------------
Status:    OFFLINE JBOD
Model:     Maxtor 4G160J8
Size:      163.92 GB (320173056 blocks)
Serial #:  G805DE1E
FW:        GAK819K0
Unit:       1

/proc/scsi/scsi does still show the device:

Host: scsi1 Channel: 00 Id: 01 Lun: 00
Vendor: 3ware Model: 3w-xxxx Rev: 1.0
Type: Direct-Access ANSI SCSI revision: ffffffff

and the echo, remove below doesn't remove it. It does happily though work on some other systems with SCA interfaces.

Thanks,
Robert

Thus spake Douglas Gilbert ([email protected]):

Quoted 20 lines
Quoted 9 lines · Robert L. Harris

A long time ago I used to be able to do:

echo "scsi add-single-device 0 0 11 0" > /proc/scsi/scsi echo "scsi remove-single-device 0 0 11 0" > /proc/scsi/scsi

When I wanted to unplug a SCA scsi drive for replacement. I tried this recently on my 2.4.20 kernel and nothing happened. No errors, no change to /proc/scsi/scsi, no entry in dmsg, it just ignored it. Has this been deprecated for a new way of removing hotswap drives?

Robert,
It is not deprecated (and is still present in the lk 2.5 development series since we still have no other way of doing this from the user space).

The parsing of that expression is very rigid: no tabs or redundant spaces.

Doug Gilbert

#2 lore raw

Robert -

Quoted 11 lines · Robert L. Harris

/proc/scsi/scsi does still show the device:

Host: scsi1 Channel: 00 Id: 01 Lun: 00
Vendor: 3ware Model: 3w-xxxx Rev: 1.0
Type: Direct-Access ANSI SCSI revision: ffffffff

and the echo, remove below doesn't remove it. It does happily though work on some other systems with SCA interfaces.

Quoted 2 lines
Quoted 2 lines

echo "scsi add-single-device 0 0 11 0" > /proc/scsi/scsi echo "scsi remove-single-device 0 0 11 0" > /proc/scsi/scsi

If this is for the host/channel/id/lun as per your cat /proc/scsi/scsi, you are specifying id (target) 11, where you should have used 1.

You can also check the result of the write to see if it worked, not sure if it does anything on 2.4 when the device does not exist, on 2.5 trying to remove a non-existent device gives me:

[root@elm3b79 root]# echo "scsi remove-single-device 1 2 3 4" > /proc/scsi/scsi [root@elm3b79 root]# echo $?
1

-- Patrick Mansfield

#3 lore raw
In reply to Douglas Gilbert

Just had it hit me again.

# cat /proc/scsi/scsi 
Attached devices: 
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 03 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03
# echo "scsi remove-single-device 0 0 2 0" > /proc/scsi/scsi
# cat /proc/scsi/scsi 
Attached devices: 
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 03 Lun: 00
  Vendor: SEAGATE  Model: ST318404LC       Rev: 0006
  Type:   Direct-Access                    ANSI SCSI revision: 03

Kernel is 2.4.16. Unfortunately I didn't build the kernel so I don't
know what options it was compiled with. Is it possible the previous admin left out a piece needed to enable this?

Thus spake Douglas Gilbert ([email protected]):

Quoted 20 lines
Quoted 9 lines · Robert L. Harris

A long time ago I used to be able to do:

echo "scsi add-single-device 0 0 11 0" > /proc/scsi/scsi echo "scsi remove-single-device 0 0 11 0" > /proc/scsi/scsi

When I wanted to unplug a SCA scsi drive for replacement. I tried this recently on my 2.4.20 kernel and nothing happened. No errors, no change to /proc/scsi/scsi, no entry in dmsg, it just ignored it. Has this been deprecated for a new way of removing hotswap drives?

Robert,
It is not deprecated (and is still present in the lk 2.5 development series since we still have no other way of doing this from the user space).

The parsing of that expression is very rigid: no tabs or redundant spaces.

Doug Gilbert