I'm curious if anyone has experience tuning Sun A1000 (or similar) RAID
arrays on Solaris.  I discovered today that the arrays we've been using
have apparently been running at about the slowest possible speed.  I
used bonnie++ to test, and it recorded speeds of about 4MB/s for reading
and writing.  That's an absolutely pathetic speed -- I've got a
Linux/Sparc box right next to it doing software RAID on 3 disks, and it
can push around 30MB/s.

After hunting through some documentation, I tried enabling some caches,
which appeared to help, bringing read/write speeds up to about 10MB/s. 
I figure there's plenty more I can do, though..

Here's what I've done so far.  (The 0,1,2,3,4 bit is specifying which
LUNs to operate on, and c2t5d0s0 is the controller name)

# enable cache read-ahead
raidutil -c c2t5d0s0 -p enable 0,1,2,3,4
# enable write cache
raidutil -c c2t5d0s0 -w on 0,1,2,3,4
# enable read cache
raidutil -c c2t5d0s0 -C on 0,1,2,3,4
# set cache block size to 32 blocks
raidutil -c c2t5d0s0 -S 32          

-- 
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[ Mike Hicks | http://umn.edu/~hick0088/ | mailto:hick0088 at tc.umn.edu ]
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