[Veritas-bu] NDMP Incremental backup

[Green, Steven]

Pat,

We backup a Celerra (NS80G) with dedicated tape drives and also perform
a weekly full and daily incremental. We've not had to concern ourselves
with ctime/mtimes of files - just set the policy schedule to an
incremental type (we run diffs) and let 'er rip. We do VBB backups of
our Celerra rather than the default PAX (tar) backups because we found
this to be a better performer with our LTO2 tape drives. VBB is
EMC-specific and must be set using a custom 'set type = vbb' line in the
policy (it's documented in Celerra NDMP backup manual). Note that VBB
requires usage of checkpoint (snapsure) files, whereas a PAX type of
backup it is optional.

-----Original Message-----
From: PGerard [mailto:netbackup-forum at backupcentral.com] 
Sent: Tuesday, June 03, 2008 2:49 PM
To: VERITAS-BU at mailman.eng.auburn.edu
Subject: [Veritas-bu] NDMP Incremental backup


Hi everyone.  I am backing up an EMC Celerra using NDMP with one tape
drive attached to each of the data movers....this is working fairly
well...at least way better than the way it was before....but I do have a
question about incrementals.  One of the file systems does pretty much a
ful everytime the incremental runs.  Could that be a CTIME/MTIME thing?
Is there a necessity to turn off CTIME?  Can someone please let me know?

Thanks

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