Cyrus & ZFS performance

[Vincent Fox]

Dale Ghent wrote:
 > Sorry for the double reply, but by the way, what sort of compression 
ratio are you seeing on your ZFS filesystems?

{cyrus1:vf5:136} zfs get compressratio cyrus/mail
NAME             PROPERTY       VALUE                      SOURCE
cyrus/mail       compressratio  1.26x                      -

I'd be interested to see what happens when gzip compression is available.
I'm not sure whether that will be 10u4 or have to wait for 11.

The T2000  is a 4-way 8-core box so we are not short of CPU, loads running
between 1-3 so it's mostly idle now.  I haven't seen the 10u3 CPU-locked
behaviour ZFS-compression to be a constraint yet don't see that much kernel
CPU-time that would indicate it.  Most activity is the Cyrus processes.

I should have specified correctly earlier, we have ~70K accounts of which
we've only migrated 27,400 at last count, so we have a ways to go.  I can't
see any reason the hardware couldn't handle the whole load on a single 
setup.
We are doing a SunCluster failover cluster pair of T2000, but this 
effectively
means a single T2000 is handling the job at any given time.  Based on 
current
loads I can't see any reason for a MURDER as long as you have at least 
mid-range
hardware to work with.

We currently have 8 gigs of RAM, I should appeal for more..........