From: Fergus Donohue (Fergus.Donohue at domain eolach.com)
Date: Fri 17 Aug 2001 - 11:45:37 IST
It may be your RAID level, are you by any chance using RAID 5 and the
write performance is suffering? RAID 5 is a dog for write performance,
each write on a single disk takes 2 ops (read block, change, write back)
- on a RAID 5 volume each write takes 4 disk ops and an XOR calculation
(read block, change, write back, read parity, XOR, write back). With my
limited testing I wouldn't use RAID 5 without hardware write caching if
you want any kind of performance.
ReiserFS should have very little overhead on a realworld system, in fact
it _should_ be faster for sequetial writes, so I'd say it's not the
All the best,
"Wynne, Conor" wrote:
> ReiserFS running on RAID volumes....
> I have been running this for a week or something now, works deadly - so far.
> Have stressfully copied files back and forth all over the gaf - hard drives
> flashing like mentlers..
> Works grand, spot on no bother. My Mp3's are still in tact, I also copied
> huge files - well 150MB tar files - just to see how it would cope.
> Yes there has been a very slight performance loss since the addition of RAID
> to the system, does anyone know if ReiserFS has any additional performance
> As for Lynx, I have been using it with great success, its the perfect
> solution for a box with no x-server! Super, just fantastic. Perfect for my
> firewall for those ftp sessions for updates etc..
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