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Name change: '/dev/dm-0' -> '/dev/lvm/home'

linux-lvm Ivan Lezhnjov Jr. 1 participant 1 message Dec 9, 2007

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Ivan Lezhnjov Jr.

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Hello,

I'm using LVM2 on my system and I faced an issue that I've set myself to resolve. The essence of the issue is shown in the following /sbin/lilo -t command output:

Quoted 11 lines
root@sega:/home/users/ilj# /sbin/lilo -t
Warning: '/proc/partitions' does not match '/dev' directory structure.
    Name change: '/dev/dm-0' -> '/dev/lvm/home'
Warning: Name change: '/dev/dm-1' -> '/dev/lvm/tmp'
Warning: Name change: '/dev/dm-2' -> '/dev/lvm/usr'
Warning: Name change: '/dev/dm-3' -> '/dev/lvm/var'
Added linux-2.6.23 *
Added 2.6.22
Added linux-2.6.19.5
The boot sector and the map file have *NOT* been altered.
4 warnings were issued.

I'm pretty novice to device-mapper (hey, i'm a mere user! :) ) and LVM. I use basic configurations for both. Nothing really special.

These warnings LILO returns weren't always there. They appeared after a recent system update (I'm running Source Mage). There were no such warnings previously. I contacted a LILO maintainer on a related issue and he kindly responded with confirmation that these warnings are not LILO related. As far as I know, LVM is a set of userspace tools and the actual job is done by device-mapper. I did try to contact the developers of dev-mappper project but no single person replied to my message so I'm writing you now, the developers of LVM.

My goal is to comprehend the origin of the warnings and their actual meaning, also set things straight so that LILO doesn't return these warnings.

Hopefully, you are the guys that can help me with this :)

Information about what software version numbers I use and configuration details:

- linux 2.6.23
(not patched but not vanilla either; configured tuned and tweaked with my own two hands :))

device-mapper related linux configuration options:

Quoted 11 lines

CONFIG_BLK_DEV_DM=y
# CONFIG_DM_DEBUG is not set
CONFIG_DM_CRYPT=y
CONFIG_DM_SNAPSHOT=y
CONFIG_DM_MIRROR=y
CONFIG_DM_ZERO=y
CONFIG_DM_MULTIPATH=y
# CONFIG_DM_MULTIPATH_EMC is not set
# CONFIG_DM_MULTIPATH_RDAC is not set
# CONFIG_DM_DELAY is not set
# CONFIG_DM9102 is not set

- lilo 22.8
- lvm 2.02.28

Physical Volume I use

Quoted 11 lines
root@sega:/home/users/ilj# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               lvm
  PV Size               69.87 GB / not usable 3.30 MB
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              17886
  Free PE               0
  Allocated PE          17886
  PV UUID               eRl10i-TM4M-Z7yk-JOGu-b0o9-IaNa-G1iThc

Virtual Group on the Physical Volume

Quoted 13 lines
root@sega:/home/users/ilj# vgdisplay
  --- Volume group ---
  VG Name               lvm
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  13
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
Quoted 8 lines
  Cur PV                1
  Act PV                1
  VG Size               69.87 GB
  PE Size               4.00 MB
  Total PE              17886
  Alloc PE / Size       17886 / 69.87 GB
  Free  PE / Size       0 / 0
  VG UUID               PdcYgd-CsWE-CVUJ-po1J-tKGp-VdW9-08bx33

Logical Volumes themselves

Quoted 44 lines
root@sega:/home/users/ilj# lvdisplay
  --- Logical volume ---
  LV Name                /dev/lvm/home
  VG Name                lvm
  LV UUID                IlQCbp-CY44-E5Fn-VHk2-CGVR-Cgud-aLCtNv
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                49.87 GB
  Current LE             12766
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:0

--- Logical volume ---

  LV Name                /dev/lvm/tmp
  VG Name                lvm
  LV UUID                s9tqUP-V0il-2jd1-suyS-bLpG-Wy2n-zm4Eeu
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                2.00 GB
  Current LE             512
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:1

--- Logical volume ---

  LV Name                /dev/lvm/usr
  VG Name                lvm
  LV UUID                A8PDF8-8o8X-hX2H-WiYq-nBTF-Cbtd-DpVwxq
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                14.00 GB
  Current LE             3584
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:2

--- Logical volume ---

Quoted 12 lines
  LV Name                /dev/lvm/var
  VG Name                lvm
  LV UUID                7hagoJ-k3t7-yyZ1-d5Tc-C106-KOQK-3K3vpV
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                4.00 GB
  Current LE             1024
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:3

- device-mapper-1.02.22

Quoted 3 lines
root@sega:/home/users/ilj# dmsetup --version
Library version:   1.02.22 (2007-08-21)
Driver version:    4.11.0

This is it. If I missed anything, please, let me know.
I'm really looking forward to getting answers to my questions. I'm more than just curious now since I've spent quite a period of time already trying to figure out the answers on my own, bothered random people in real life and on the Internet in forums, IRC and now in mailing-lists :)

I really want to know what these warnings are all about :)

Signature · 7 lines
Ivan Lezhnjov Jr.

Europe, Ukraine, Simferopol. Local Time:
Sun Dec  9 20:48:30 EET 2007

Source Mage GNU/Linux 0.9.6.3, linux-2.6.23 #1
Disassemble To Assemble Something Pure