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" <[EMAIL PROTECTED]> To: "Joel Jaeggli" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> 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. > > > > >