On Mon, 17 May 2004, Lizzy Dizzy wrote: > Thanks. > > So does it means that the number of partition as well as the total size per > harddisk does not matter? > > As long as the harddisk has multiple spindles, performance would be > equivalent?
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. > Regards > Liz > > > >From: "Elsen Marc" <[EMAIL PROTECTED]> > >To: "Lizzy Dizzy" <[EMAIL PROTECTED]>,<[EMAIL PROTECTED]> > >Subject: RE: [squid-users] Squid performance issue [again] > >Date: Mon, 17 May 2004 10:23:52 +0200 > > > > > > > > > > > > Hi, > > > > > > I understand that the size of the physical RAM has to be > > > proportional to the > > > total harddisk cache size. Supposing I have > > > > > > unlimited physical RAM, > > > > > > > > > 1) What is the recommended size of 1 physical harddisk for > > > each server (each > > > server can have sda, sdb etc...). The reason I > > > > > > am asking this is that I am concern that the bigger a disk > > > is, the longer > > > squid needs to get an object out of it. > > > > > > I am currently using a U320 SCSI disk of 10KRPM, size 73GB. > > > It is being > > > partitioned into 4 smaller partition of 17GB each. > > > > > > Performace is within expectation, but I am wondering if > > > reparttioning it > > > into smaller sizes would give better yield. On the > > > > > > other hand, the disk has a fixed number of head, so would it > > > even help? > > > > > > 2) In term of performance only, is a 100GB harddisk better > > > (partitioned into > > > 5 20GB partitioned) or 5 20GB harddisks better. > > > > > The multiple spindles solution would be better, as SQUID's performance > > highly depends on (reduced) seek time(s). > > > > M. > > _________________________________________________________________ > Take a break! Find destinations on MSN Travel. http://www.msn.com.sg/travel/ > -- -------------------------------------------------------------------------- Joel Jaeggli Unix Consulting [EMAIL PROTECTED] GPG Key Fingerprint: 5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2
