Conor Wynne wrote:
> I would not rely on hdparm tests, they are not valid. They dont take into
> account disk cache etc. Never mind controller cache if applicable.
The buffered disk reads figure is useful as a rough indicator though,
and in this case it seems the array is really slow.
For comparison:
Bog standard Maxtor SATA (6Y120M0): ~49MB/sec
RAID-1 of decent SAS drives in a newish DELL server: ~100MB/sec
18MB/sec is low.
Have you tested the bare drives or a RAID-0 configuration?
If you can take the drives out the case and stick them in
a regular (x86) machine you should be able to see if it's the
CPU.
--
Nick Murtagh <nickm at go2.ie>
go2web Ltd., Harbour House, Harbour Road, Howth, Dublin 13
http://www.go2.ie/ - Phone +353-(0)1-839-5432 - Fax +353-(0)1-839-5439
Registered in Ireland: No. 327376
Registered address: 53 Thormanby Lawns, Howth, Dublin 13
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!
