Re: squid storage: stripes vs separate drives for cache dirs

From: Henrik Nordstrom <>
Date: Sun, 04 Apr 1999 22:55:25 +0200 wrote:

> It's quite the same at our systems: currently we are running one with
> async-io and the other one without this option, both configured with
> a big stripe of 5 disks.
> At the current load we mostly see no performance differences.

My recommendation regarding the use of async-io in Squid is to start
without it. Only if Squid seems to be disk I/O bound on your system then
try using async-io. Also note that you get close to the same performance
gains by using a logging or asyncronous update filesystem, combined with
appropriate virtual-memory tuning to have enought memory on the free
list even on heavy I/O activity. Blindingly turning on async-io in Squid
without also looking into these issues is perhaps not the best approach
to the problem, and may actually cause more problems than it solves.

Henrik Nordstrom
Spare time Squid hacker
Received on Sun Apr 04 1999 - 18:14:22 MDT

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