Snapshot image fails to mount

[mrn]

Trying to use snapshot to get around a log rotate problem were having.

AIX 5.2 ML5

From command line (with no log being written)

snapshot -o snapfrom=/testlog -o size=16M

works; giving me

snapshot -q /testlog

Current Location 512-Blocks Free Time
* /dev/fslv11 131072 130304 Wed Jun 14 09:07:21

which I can mount using

mount -v jfs2 -o snapshot /dev/fslv11 /testsnap

however with the log writting

I get the following message

ERROR : 1 : command "mount -v jfs2 -o snapshot /dev/fslv11 /testsnap" failed : mount: /dev/fslv11 on /testsnap: Unformatted or incompatible media.

&

Current Location 512-blocks Free Time
INVALID /dev/fslv11 262144 Tue Jun 13 14:11:08 2006

Having read the documentation I can find the snapshot should work on an active filesystem. Anyone got any ideas?



Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

http://www.airport-parking-site.co.uk/

 

[khalidaaa]

What type of log is yours? is it jfs2?

Regards,
Khalid

 

[mrn]

The log is a ULOG produced by Tuxedo; just standard ascii format. The filesystem is JFS2, tried with both external & inline log, to no avail.

Both /testlog & /testsnap are 1Gb


I may have discovered the problem; when reviewing errpt the following message is shown

----------------------------------------------------
J2_SNAP_FULL
unable to allocate in JFS2 snapshot
INSUFFICIENT STORAGE MEDIA SPACE
The snapshots for the JFS2 file system were deleted.
----------------------------------------------------


when creating snapshot on an inactive fs I can create multiple snapshots. As soon as I try to create a snapshot with an active fs all the snapshots are marked INVALID. So I guess I need to make the size of the snapshot = size of filesystem (1Gb) (makes sense when you think about it). I'll try and report back.

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

http://www.airport-parking-site.co.uk/