Backup strategy for large mailbox stores
vbfox at ucdavis.edu
Mon Feb 15 13:06:14 EST 2010
Forgot to mention we are running inline compression on
our ZFS pools. With "fast" LZJB compression on the
filesystems for metadata etc. still a savings of ~2.0.
The inboxes are all in /var/cyrus/mail which is set for
gzip-6 compression savings of ~ 1.7. Backups run
faster so it's win-win.
Combined with Cyrus single-instance store our I/O
channels are in fact fairly idle statistically 4% maybe
hitting 20% when busy. The Sun V245 mail-stores
are fairly modest dual-CPU systems and load runs
~.7 most of the time so all this stuff which you would
assume would really shift a lot of load onto CPU doesn't
in fact result in any sort of bottleneck.
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