http://oss.sgi.com/bugzilla/show_bug.cgi?id=769
Summary: XFS snapshots does not work with linux LVM
Product: Linux XFS
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: XFS kernel code
AssignedTo: xfs-master@xxxxxxxxxxx
ReportedBy: sheshka@xxxxxxxxx
Taking snapshots on LVM with XFS filesystem hangs.
dark-matter:~# lvdisplay
--- Logical volume ---
LV Name /dev/tvg/lvol0
VG Name tvg
LV UUID SGTmpR-8Rv7-Mx54-3oKl-SFTY-r8pY-eUcbfN
LV Write Access read/write
LV Status available
# open 0
LV Size 1.00 GB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 254:1
dark-matter:~# vgdisplay
--- Volume group ---
VG Name tvg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 18.63 GB
PE Size 4.00 MB
Total PE 4769
Alloc PE / Size 256 / 1.00 GB
Free PE / Size 4513 / 17.63 GB
VG UUID 1wOZ3M-zdc9-i519-UX3G-MTOl-fLnb-3Jwy76
dark-matter:~# mkfs.xfs /dev/tvg/lvol0
meta-data=/dev/tvg/lvol0 isize=256 agcount=8, agsize=32768 blks
= sectsz=512 attr=0
data = bsize=4096 blocks=262144, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=1
naming =version 2 bsize=4096
log =internal log bsize=4096 blocks=2560, version=1
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
dark-matter:~# mount /dev/tvg/lvol0 /mnt/1/
dark-matter:~# dd if=/dev/full of=/mnt/1/t.bin bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.161915 seconds, 648 MB/s
dark-matter:~# xfs_freeze -f /mnt/1/
dark-matter:~# lvcreate -L 500M -s -n snap1 /dev/tvg/lvol0
And last command hangs a forever, or sometimes produses broken snapshot whuch
cannot be mounted:
#mount /dev/tvg/snap1 /mnt/2 -t xfs -o nouuid
XFS: bad magic number
XFS: SB validate failed
My kernel is:
2.6.21-2-amd64 #1 SMP Wed Jul 11 05:38:29 UTC 2007 x86_64 GNU/Linux
from Debian. But I have had same issue with vanila kernel. I can provide any
additional info.
There is no such issue with ext3 FS on LVM, snapshotig works well.
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