Hello!
I recently tried to lvremove a snapshot LV that was
a few days old. I had let it get to the point
where the LV snapshot was unusable because too
many changes had been written to the parent.
When I went to lvremove it, the entire system
locked up and had to be reset. Everything
came back up fine but I still want to remove
that LV and am unsure as to why it crashed
to begin with.
I could not see anything on console and there's nothing
interesting in my system logs.
Here's my LV setup:
[root@dw ~]# lvscan
/dev/dm-5: read failed after 0 of 4096 at 0: Input/output error
ACTIVE '/dev/VolGroup00/Lroot' [6.00 GB] inherit
ACTIVE '/dev/VolGroup00/Lswap' [1.94 GB] inherit
inactive Original '/dev/VolGroup00/Llpdw' [40.00 GB] inherit
inactive Snapshot '/dev/VolGroup00/temp' [1.00 GB] inherit
/dev/VolGroup00/Lroot /dev/VolGroup00/Lswap and
/dev/VolGroup00/Llpdw are all mounted, active
file systems. /dev/VolGroup00/temp is a snapshot
of /dev/VolGroup00/Llpdw.
Like I mentioned before the snapshot is unusable and
I want to remove it:
[root@dw ~]# mount /dev/VolGroup00/temp /z
/dev/VolGroup00/temp: Input/output error
mount: /dev/VolGroup00/temp: can't read superblock
system info:
[root@dw ~]# cat /etc/redhat-release; uname -a
CentOS release 4.4 (Final)
Linux dw.xxxxxxx 2.6.9-42.0.3.ELsmp #1 SMP Fri Oct 6 06:28:26 CDT 2006 x86_64 x86_64 x86_64 GNU/Linux
Dell PowerEdge 1950 server.
more lvm info:
[root@dw ~]# pvdisplay
/dev/dm-5: read failed after 0 of 4096 at 0: Input/output error
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 136.00 GB / not usable 0
Allocatable yes
PE Size (KByte) 32768
Total PE 4352
Free PE 2786
Allocated PE 1566
PV UUID 5Vshsw-Swd9-bSTH-kixv-frPK-SzSi-jm31hE
[root@dw ~]# vgdisplay
/dev/dm-5: read failed after 0 of 4096 at 0: Input/output error
--- Volume group ---
VG Name VolGroup00
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 30
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 136.00 GB
PE Size 32.00 MB
Total PE 4352
Alloc PE / Size 1566 / 48.94 GB
Free PE / Size 2786 / 87.06 GB
VG UUID MHdx9f-7mNZ-WtEp-ogmZ-Wo2H-47Db-o90d0e
[root@dw ~]# lvdisplay
/dev/dm-5: read failed after 0 of 4096 at 0: Input/output error
--- Logical volume ---
LV Name /dev/VolGroup00/Lroot
VG Name VolGroup00
LV UUID ZNXYXZ-fFHI-GPsn-fGZy-0QtI-19TR-iGwtmx
LV Write Access read/write
LV Status available
# open 1
LV Size 6.00 GB
Current LE 192
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0
--- Logical volume ---
LV Name /dev/VolGroup00/Lswap
VG Name VolGroup00
LV UUID 5ZiUYo-aC7P-0YyN-XDAI-kiVc-GUz7-zCB5Q8
LV Write Access read/write
LV Status available
# open 1
LV Size 1.94 GB
Current LE 62
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1
--- Logical volume ---
LV Name /dev/VolGroup00/Llpdw
VG Name VolGroup00
LV UUID HJ9V38-zAYH-Et0F-Qb9o-8dzu-PwbQ-5AgPiF
LV Write Access read/write
LV snapshot status source of
/dev/VolGroup00/temp [INACTIVE]
LV Status available
# open 1
LV Size 40.00 GB
Current LE 1280
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:3
--- Logical volume ---
LV Name /dev/VolGroup00/temp
VG Name VolGroup00
LV UUID yv8X2f-9Xud-PkJT-Q0l2-h5Qy-48ze-KOAg3t
LV Write Access read/write
LV snapshot status INACTIVE destination for /dev/VolGroup00/Llpdw
LV Status available
# open 0
LV Size 40.00 GB
Current LE 1280
COW-table size 1.00 GB
COW-table LE 32
Snapshot chunk size 8.00 KB
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:5
The command I typed in that caused the crash
was 'lvremove /dev/VolGroup00/temp'.
Thanks in advance for any replies. I am
going to try this command again tomorrow
night after I do some more research into this.
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
