Re: [gentoo-user] dual scsi configuration?

[Zac Slade]

On Friday 08 September 2006 19:43, James wrote:
> If I want maximum/optimized IO performance
> from these drives what is the best file system
> to use and drive configuration. (1/2) the swap space
> on each drive? Raid level? Other methods? EVMS(which
> I know nothing about)?
Well what's the workload?  Random reads, sequential reads, random writes, 
sequential writes?  All these are important to selecting the best method of 
getting optimal I/O.  There is no one perfect filesystem/raid level for 
everything.

Since you are using only a 400Mhz processor I think that reiser3 may be out of 
the question.  It uses a lot of CPU and gets great performace, but if the 
processor can't keep up then reiser loses a lot of performance.

Also any Device Mapper layers will slow you down a bit.  I user LVM and love 
it, but if I really need maximum raw throughput I'd look to hw RAID or sw 
based RAID (if my system is up to that).

For filesystems it just depends on your needs.  If you want high sequential 
reads/writes then JFS and XFS are particularly good.  If you need an all 
around performer, random reads/writes with good sequential throughput then 
ext3 and reiser (see above note on reiser).  Reiser is also the best at 
purely random access especially with large directories (1,000s of little 
files).

To be honest if you just go look at the filesystem howtos and filesystem 
comparisons (use google luke) you won't go wrong.  They are all up to the 
task as long as you know a little bit about what your workload is going to 
look like.
-- 
Zac Slade
krakrjak@××××××××××.net
ICQ:1415282 YM:krakrjak AIM:ttyp99
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