Re: [squid-users] Performance question

> On Thu, 30 Jun 2005, Matus UHLAR - fantomas wrote:
> >BTW I think I've found another reason why RAID should not behave better
> >with squid: even SCSI disks behave better on sequential reads. So,
> >fetching a file sequentially from a drive (case of multiple filesystems
> >on multiple drives) should be faster than fetching some parts (size of a
> >stripe) from one disk and some parts from second disk

On 30.06 12:07, Henrik Nordstrom wrote:
> Luckily for RAID0/5 the stripe size often practically eleminates this
> drawback as the percentage of small reads crossing a stripe boundary is
> fairly small.

but big files that cross stripe boundary more times will still be read from
multiple disks. Not that bad as small files, bud still no good.

> RAID0 does not give any performance benefit for Squid as Squid already
> distributes the load among the cache_dirs.

What I meant in my previous post is, that using raid0 might lower the speed
a bit comparing to multiple cache_dirs, because it tends to lower count and
comprehesiveness of sequential reads/writes

-- 
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
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