Folks,
A question for those of you running ZFS as the filesystem architecture
for your Cyrus message store : did you consider, measure and/or carry
out a change of the default 128 KB blocksize ?
If so, what value are you using ?
Regards,
Eric Luyten, Computing Centre VUB/ULB.
Cyrus Home
Am 09.08.10 17:22, schrieb Eric Luyten:
Folks,
A question for those of you running ZFS as the filesystem architecture
for your Cyrus message store : did you consider, measure and/or carry
out a change of the default 128 KB blocksize ?
If so, what value are you using ?
First:
Changes to ZFS
Am 09.08.10 17:33, schrieb Pascal Gienger:
A smaller record size is a good option if you notice an i/o bottleneck
on your fiberchannel/iSCSI/SAS link. It won't bring you a performance
gain in random i/o. There is a small exception: Database systems writing
always the same fixed blocksize. For
Hello!
Folks, looking through maillist history i saw that many of you are
running cyrus in rolling replication mode. I am interested in
configuring cyrus replica to use as a standby imap server, where we can
switch DNS in case of problems with primary backend. While testing on
For what Cyrus is doing on Solaris with ZFS, the
recordsize seems nearly negligible. What with all the
caching in the way, and how ZFS orders transactions, it's
about the last tuneable I'd worry about.
Here's what works well for us, add this to /etc/system:
* Turn off ZFS cache flushing
set
Am 09.08.10 19:46, schrieb Vincent Fox:
* Turn off ZFS cache flushing
set zfs:zfs_nocacheflush = 1
For hardware (fiberchannel, iSCSI, SSA, ...) arrays with their own Cache
this is a must.
* Increase DNLC (Directory Name Lookup Cache)
set ncsize = 50
vmstat -s | grep 'total name
On Mon, 2010-08-09 at 17:22 +0200, Eric Luyten wrote:
Folks,
did you consider, measure and/or carry
out a change of the default 128 KB blocksize ?
To more directly answer your question than last post...
We did some testing with Bonnie++ prior to deployment
and changing recordsize didn't
On Mon, Aug 09, 2010 at 08:15:36PM +0400, Dmitry Ivanov wrote:
Hello!
Folks, looking through maillist history i saw that many of you are
running cyrus in rolling replication mode. I am interested in
configuring cyrus replica to use as a standby imap server, where we can
switch DNS in
