Re: [squid-users] Number of Spindles

From: Nyamul Hassan <>
Date: Sun, 30 Nov 2008 10:31:38 +0600

Thankx Amos, for the quick answer. This book is indeed old, Jan 2004. But
it was interesting to see this comment, because it discusses all the storage
schemes: ufs, aufs, diskd, coss & null. Perhaps he was only mentioning ufs.

I have a short question:

Duane also says to resize the L1 and L2 values in storage scheme to
reasonable values so that each folder holds just a few hundred files. I'm
using the default values, and my object count is 7M, making it a 3.3k+
objects per folder. Should I be concerned about this?


----- Original Message -----
From: "Amos Jeffries" <>
To: "Nyamul Hassan" <>
Cc: "Squid Users" <>
Sent: Sunday, November 30, 2008 10:11
Subject: Re: [squid-users] Number of Spindles

> Nyamul Hassan wrote:
>> Hi,
>> I was reading through Duane Wessel's book, and I must say, it is a GREAT
>> book. If only I had read it earlier, my life would've been so much
>> better! :)
>> I was reading through Appendix D: Filesystem Performance benchmarks,
>> where Duane says the following:
>> "The primary purpose of these tests is to show that Squid's performance
>> doesn't increase in proportion to the number of disk drives. Excluding
>> other factors, you may be able to get better performance from three
>> systems with one disk drive each, rather than a single system with three
>> drives."
>> Isn't this contrary to what we've been seeing over and over again in the
>> forum, that increasing the number of spindles distributes disk IO, and
>> increases cache efficiency by avoiding io_wait for the CPU? Or is it
>> that, when you use SCSI U320 HDDs, your io_wait becomes a non issue, and
>> that is what Duane was referring to when he started the concluding line
>> with "Excluding other factors"?
>> Could the gurus in this forum please shed some light on this?
> The books is rather old. From the days of Squid-2.5.
> I think diskd was developed in Squid as a solution to that problem, then
> AUFS came along to improve things even further as a native OS layer.
> Plain old single-threaded UFS still displays many of the performance
> issues mentioned.
> Amos
> --
> Please be using
> Current Stable Squid 2.7.STABLE5 or 3.0.STABLE10
> Current Beta Squid
Received on Sun Nov 30 2008 - 04:32:04 MST

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