tweaking FreeBSD for Squid using
alain at ait.ac.th
Tue Apr 15 19:48:48 PDT 2003
On Tue, Apr 15, 2003 at 07:31:24PM -0700, Jason Stone wrote:
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> > You didn't mention whether is it SCSI or IDE.
> Based on the fact that it's 15k rpms, I'm guessing scsi - do ide disks
> faster than 7.2k rpms exist?
I don't know. Seems that IDE disks evolve too fast for me nowadays.
That's also why I was writing that I'm not even sure that the old
stance "don't use IDE for servers" is still valid.
OOTH, I've had a lot of trouble with busy IDE-based (ASUS P4* m/b)
FreeBSD servers lately (hard hangs, see bug kern/44867).
> > Don't do RAID. Bring up a filesystem on each disk (with soft updates
> > of course), mount them "-o noatime" and configure Squid to use
> > multiple cache dirs.
> Why is this preferrable to striping with raid-0?
Well, because Squid does load balancing over multiple cache dirs quite
well by itself, and (presumably) in a smarter way than just spreading
raw disk blocks, so adding another layer of software for RAID-0 doesn't
bring anything, and wastes CPU cycles. I'm not even sure that hardware
RAID-0 is a good idea. According to my own experience (admittedly on a
Linux box), removing software striping and using multiple cache dirs
on physical volumes gave me a significant performance boost and
lowered the load average of the server by about 30%.
Since then, I've always stayed away from RAID on Squid boxes, whatever
Er. This is getting off topic maybe. I'll follow up privately if
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