Hello,
I noticed that lvm2 create/remove snapshot of logical volume feature
with 2.6.x kernel series is still very bad and at last randomly causes
that any access (read/write) to that lv is impossible or even ocures
system hung up.
In detail especially create/remove many snapshots of XFS logical volume
is big problem and causes randomly hung up xfs_io or dmsetup
suspend/resume calls in memory.
Please if somebody could help and give me some exemple(s) of proper use
dmsetup tool (suspend/resume) or maybe xfs_freeze -f/u command under
creating/removing snapshot and copying data at the same time ?
Should i use any of above dmsetup or xfs_freeze commands ?
My configuration :
- Debian GNU/Linux 3.0 stable
- tested kernels: 2.6.12.3, 2.6.13.2, 2.6.14rc1, 2.6.14rc2
- libdevmapper and lvm2 1.05 - both from cvs
- 512MB DDR RAM
- 3ware 3xxx SATA Raid controller
- 8x 250GB SATA HDD (Raid0 sda = 1.36T)
- 1x vg, 1x xfs lv = 698GB, 2x snapshot = 349GB each
I randomly creating / removing snashots under copying data from remote
host to smb share or to iSCSI target on my server.
I noticed that best results give me xfs_freeze -f/u usage but it
sometimes couses that xfs_io hung up and then any i/o calls to XFS
logical volume are inpossible.
Even if i add more RAM (1/2GB) it not help.
What dm-devel patches should be applied (patches 8 and 9 for snapshots
don't make any diffrence) ?
Thanks for any help.
Best regards
Hubert
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