We are dealing with issue that time to time periodic VSS snapshots produced by
Windows scheduler are disappearing after Bacula backup (FULL or INC or DIFF,
VSS enabled in the FileSet definition).
Any idea about this sporadic disappearing of Windows VSS snapshots?
Let me guess, you windows server is 2003? I spent months chasing this
with PSS a couple years ago. If your VSS snapshot's are on the same
spindles as your data, during times of high IO load windows will simply
dump the whole store.
The solution was to offload snapshots to different spindles and controller
which worked flawlessly ever since. VSS in W2008+ has been improved quite
a bit FWIW...
So my guess is that bacula instantiates a snapshot and begins dumping
the data and IO climbs rather high producing the issue. Where are your
snapshots being stored and you might want to run perfmon during your
next backup.
jlc
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