[nmglug] Raid Help

[Jason Davis]

On Wed, 2005-05-25 at 15:21 -0700, Tim Emerick wrote:
> I need some help with my Debian/samba server with regards to raid
> performance.
> 
> I get pretty fast reads but extremely slow writes.  A folder with 116MB took
> 38 seconds to read from the server but 5 minutes 18 seconds to write to the
> server.  I've heard that fast reads and normal writes is fairly typical with
> a simple mirror raid but the slowness of my writes are ridiculous.  
> 
> I think I probably have something mis-configured.  I would like to have a
> conversation with someone that can help me figure out either what is wrong or
> what I can do to get better performance. Please feel free to contact me in
> person or chat for a more "Live" discussion. I would greatly welcome any
> help.

so , i take it this is ide raid. Do all the ide disks have dma enabled?

to see:
hdparm /dev/hde1

to set:
hdparm -d1 /dev/hde1

does hdparm -tT work with raid sets?


good luck,
jd