[linux-lvm] some issues with pvmove
Aran Cox
acox at ia.primustel.com
Thu Dec 9 20:13:03 UTC 2004
I've been working on lvmove, a frontend to pvmove that I've used in the
past with LVM1 systems to re-organize the layout of logical volumes in a
volume group. I keep getting failures with pvmove that require
restoring metadata from backup.
When trying to re-shuffle extents on a mostly full VG you quickly end up
with a very convoluted layout. I think this is similar to what most
defrag type programs do. In general it has to make things worse before
it can make it any better.
In any case, I can usually work around failed pvmoves like the one that
follows by moving fewer extents in one move and then letting the program
continue on it's own. Does the failed pvmove below indicate a bug or is
there some way I can predict when a pvmove would fail and avoid issuing
that one? Am I running into some limit that is going to keep me from
re-organizing my lv layout? Can I provide other information that would
be helpful to someone looking into this?
When I'm done cleaning up lvmove I'll post it to the list. If nothing
else, it's a torture test for pvmove and the dm-mirror module.
FC3
kernel 2.6.9-1.667
LVM version: 2.00.29 (2004-11-27)
Library version: 1.00.19-ioctl (2004-07-03)
Driver version: 4.1.0
pvmove --alloc anywhere /dev/hdb1:4192:4389-4391:4467:4488 /dev/hdb1:4120:4317-4319:4395:4416
/dev/hdb1: Moved: 16.7%
Volume group for uuid not found: qfgWQt1Ke30N30JZfcdUkvPXTPt0t6Y400000000000000000000000000000007
Failed to suspend video2
ABORTING: Segment progression failed.
/dev/hdc1: Checksum error
Couldn't read volume group metadata.
/dev/hda3: Checksum error
Couldn't read volume group metadata.
/dev/hda4: Checksum error
Couldn't read volume group metadata.
/dev/hdb1: Checksum error
Couldn't read volume group metadata.
/dev/hdd1: Checksum error
Couldn't read volume group metadata.
Volume group for uuid not found: qfgWQt1Ke30N30JZfcdUkvPXTPt0t6Y400000000000000000000000000000007
Failed to suspend video2
Locking LVs to remove temporary mirror failed
/dev/hdc1: Checksum error
Couldn't read volume group metadata.
/dev/hda3: Checksum error
Couldn't read volume group metadata.
/dev/hda4: Checksum error
Couldn't read volume group metadata.
/dev/hdb1: Checksum error
Couldn't read volume group metadata.
/dev/hdd1: Checksum error
Couldn't read volume group metadata.
Volume group for uuid not found: qfgWQt1Ke30N30JZfcdUkvPXTPt0t6Y4cvS4zAgUf4ocmVJUYX1nvir6u7Z4PMHv
Suspension of temporary mirror LV failed
Device '/dev/hdd1' has been left open.
Device '/dev/hdc1' has been left open.
Device '/dev/hdb1' has been left open.
Device '/dev/hda3' has been left open.
Device '/dev/hda4' has been left open.
command failed: 1280 at /home/spin/lvmove line 164.
This is the state of my VG before the attempted move:
Finding all volume groups
Finding volume group "main2"
--- Volume group ---
VG Name main2
System ID cain1067664603
Format lvm2
Metadata Areas 5
Metadata Sequence No 1612
VG Access read/write
VG Status resizable
MAX LV 256
Cur LV 8
Open LV 8
Max PV 256
Cur PV 5
Act PV 5
VG Size 269.77 GB
PE Size 16.00 MB
Total PE 17265
Alloc PE / Size 16978 / 265.28 GB
Free PE / Size 287 / 4.48 GB
VG UUID qfgWQt-1Ke3-0N30-JZfc-dUkv-PXTP-t0t6Y4
--- Logical volume ---
LV Name /dev/main2/swap
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000000
LV Write Access read/write
LV Status available
# open 1
LV Size 2.00 GB
Current LE 128
Segments 1
Allocation normal
Read ahead sectors 1024
Block device 253:0
--- Logical volume ---
LV Name /dev/main2/home
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000001
LV Write Access read/write
LV Status available
# open 1
LV Size 10.61 GB
Current LE 679
Segments 1
Allocation normal
Read ahead sectors 1024
Block device 253:1
--- Logical volume ---
LV Name /dev/main2/usr
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000002
LV Write Access read/write
LV Status available
# open 1
LV Size 4.94 GB
Current LE 316
Segments 1
Allocation normal
Read ahead sectors 1024
Block device 253:2
--- Logical volume ---
LV Name /dev/main2/var
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000003
LV Write Access read/write
LV Status available
# open 1
LV Size 1.00 GB
Current LE 64
Segments 1
Allocation normal
Read ahead sectors 1024
Block device 253:3
--- Logical volume ---
LV Name /dev/main2/log
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000004
LV Write Access read/write
LV Status available
# open 1
LV Size 512.00 MB
Current LE 32
Segments 1
Allocation normal
Read ahead sectors 1024
Block device 253:4
--- Logical volume ---
LV Name /dev/main2/imap
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000006
LV Write Access read/write
LV Status available
# open 2
LV Size 3.17 GB
Current LE 203
Segments 1
Allocation normal
Read ahead sectors 1024
Block device 253:5
--- Logical volume ---
LV Name /dev/main2/video2
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000007
LV Write Access read/write
LV Status available
# open 1
LV Size 239.06 GB
Current LE 15300
Segments 741
Allocation normal
Read ahead sectors 0
Block device 253:6
--- Logical volume ---
LV Name /dev/main2/squid
VG Name main2
LV UUID 000000-0000-0000-0000-0000-0000-000009
LV Write Access read/write
LV Status available
# open 1
LV Size 4.00 GB
Current LE 256
Segments 7
Allocation normal
Read ahead sectors 1024
Block device 253:7
--- Physical volumes ---
PV Name /dev/hdc1
PV UUID 58ZN9k-K75s-zVIN-pwlJ-1FGN-Wtps-qlo6Ok
PV Status allocatable
Total PE / Free PE 2452 / 131
PV Name /dev/hda3
PV UUID q3c32q-CeGr-EVR3-bo5k-kh6x-Jvkg-BkzFVy
PV Status allocatable
Total PE / Free PE 2324 / 0
PV Name /dev/hda4
PV UUID 3jnAEZ-fFNz-cY0Y-53Cy-KMQJ-HJgK-7XQamL
PV Status allocatable
Total PE / Free PE 4872 / 0
PV Name /dev/hdb1
PV UUID GILY4s-NXCh-p72w-3mqI-795b-VJiM-zCHdLy
PV Status allocatable
Total PE / Free PE 7361 / 27
PV Name /dev/hdd1
PV UUID fx1w8q-xvMl-BEXO-bGW6-BxI7-NzCG-H2YTSV
PV Status allocatable
Total PE / Free PE 256 / 129
--
Aran Cox <acox at ia.primustel.com>
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