Re: 1x 3ware controllers vs. 2x 3ware controllers

On Sun, 1 Aug 2004, Mark Watts wrote:

quoted

RAID Configuration:
4-disk RAID-5 with 64K block size.

/dev/sda1 = / = 20GB
/dev/sda2 = swap = 2048MB
/dev/sda5 = /home = 100GB

All partitions (except swap) formatted as ext3.

It would be interesting to see difference if you put the system and swap
on another drive that is not part of the RAID5.

With 2GB ram, I can disable swap entirely if you want, but I don't have 
another drive to put it on.

quoted

Kernel - 2.6.8rc1, SMP for x86_64

I use v2.4, haven't used 2.6 with 3ware and SMP at all, so the problem
might be there. Did you try the smp_affinity thing I emailed about 1-2
days ago?

No - The system is at work - I'll try it on Monday.

quoted

Slow write speeds is one thing, practically locking the system up while
the write occurs is another, unless I'm missing something obvious.

Well, if the system needs to page-in and this page-in takes seconds to
fulfil because the raid5 is full at work and has a large latency queue,
that might explain it. Does the system do anything else when you're
copying?

No (thats the point!). Playing (or rather skipping) mp3's with xmms is about 
the most it does.

I'm going to try using xfs instead of ext3 on Monday too.