Re: [squid-users] Squid performance issue [again]

Just read in http://www.oreilly.com/catalog/squid/chapter/ch08.pdf that you
should never use RAID for squid cache directories because it always degrades
filesystem performance for squid.

----- Original Message -----
From: "Hendrik Voigtländer" <hendrik@voigtlaenders.net>
To: "Joel Jaeggli" <joelja@darkwing.uoregon.edu>
Cc: <squid-users@squid-cache.org>
Sent: Tuesday, May 18, 2004 4:35 AM
Subject: Re: [squid-users] Squid performance issue [again]

> Hello,
>
> Our system uses striped cache disks.
> I really wonder if there is a difference between e.g. 2x36GB striped
> with a decent RAID-Controller (HP/Compaq, to be precise) or using those
> disks independend from each other (only for squid cache, of course)
> 1st case: both disks on same controller, same performance as striped?
> 2nd case: different controllers, faster?
>
> What do you think?
>
> Regards, Hendrik Voigtländer
>
> Joel Jaeggli wrote:
> >
> >
> > hard-drives have one spindle with one or more platters. all heads move
at
> > the same time. mechanically only one operation occurs at a time. local
> > read/write caching and really smart schedulers are the only thing that
> > buys a performance improvement on the disk over having one operation in
> > flight at a time.
> >
> > if you have multiple partions for squid on the same disk you're
> > serializing all of your operations on one drive. you're way better off
> > with more drives. I'd vastly prefer 2 36GB 15k rpm disks to 1 73GB 10k
rpm
> > disk. our current cache boxes (a little more than a year old) have 4 x
> > 18GB 15k rpm drives each just for cache dirs.
> >
> >
>
Received on Tue May 18 2004 - 00:20:56 MDT