LARGE single-system Cyrus installs?

Vincent Fox vbfox at
Wed Nov 14 13:21:10 EST 2007

Michael Bacon wrote:
> Solid state disk for the partition with the mailboxes database.
> This thing is amazing.  We've got one of the gizmos with a battery 
> backup and a RAID array of Winchester disks that it writes off to if 
> it loses power, but the latency levels on this thing are 
> non-existent.  Writes to the mailboxes database return almost 
> instantaneously when compared to regular spinning disks.  Based on my 
> experience, that's bound to be a much bigger chunk of time than 
> traversing a linked list in kernel memory.
> For anyone doing a big Cyrus install, I would strongly recommend this.

Thanks for the idea Michael.

I am thinking when our Sun Dtrace testing starts, to see if I can throw 
in one config where the DB are run out of tmpfs in order to excercise 
whether latency to those databases is causing the pileup.   I have also 
seen a posting from Pascal that ZFS mirrored configs have latency issues 
which may be contributing.

I'm not ready to point any fingers but it certainly seems worth 

It's a pity I can't find any Sun SDD drives that could just slot into 
our existing SAN setups.

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