Hi,
I have an E4500 with a connected A1000 having 9 x 36 GB disks
(I believe they're 15000rpm).
The load on the system has gone up quite a bit recently and
apparently it's because of weak read performance from the A1000
(probably heavy on disk seeks).
For my application we practically only perform read operations,
so I don't mind weak write performance. We read two types of records,
fixed-size 1KB records and variable-length records betweek 100 bytes
and perhaps 1MB.
The guy who built the file systems configured it to use
RAID 0 on 6 disks and RAID 5 on 3 disks.

Now since rebuilding the RAID is quite an undertaking, I thought
I'd ask your advice first. :-)

How would you set up the A1000 for our application?
I'm thinking about using RAID 1 to mirror data across two disks
to increase read throughput (we can manage with only half the A1000's
capacity).
Is this a good idea or is there another RAID level which offers even
better read
performance? The additional redundancy from RAID 1 would be nice, but
it
is definitiely second to performance.
Would it be a good idea to place the two types of records on different
file systems?
What do you think?

Thankful for any help!
/ Fredrik Andersson