LARGE single-system Cyrus installs?
dpc22 at cam.ac.uk
Fri Oct 5 04:58:14 EDT 2007
On Fri, 5 Oct 2007, Rob Mueller wrote:
> b) make sure you have the right filesystem (on linux, reiserfs is much
> better than ext3 even with ext3s dir hashing) and journaling modes
A data point regarding reiserfs/ext3:
We are in the process of moving from reiserfs to ext3 (with dir_index).
ext3 seems to do substantially better than reiserfs for us, especially for
read heavy loads (squatter runs at least twice as fast as it used do).
I think that this is partly because ext3 does more aggressive read ahead
(which would be a mixed blessing under heavy load), partly because
reiserfs suffers from fragmentation. I imagine that there is probably a
tipping point under the sort of very heavy load that Fastmail see.
data=ordered in both cases. data=journal didn't seem to make any
difference with ext3. data=journal with reiserfs caused amusing kernel
memory leaks, which it looks like Fastmail also hit recently. An dedicated
journal device would probably make a big difference with data=journal.
David Carter Email: David.Carter at ucs.cam.ac.uk
University Computing Service, Phone: (01223) 334502
New Museums Site, Pembroke Street, Fax: (01223) 334679
Cambridge UK. CB2 3QH.
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