That depends on the raid 0+1 or 1+0 implementation. You're looking to see if
it's an active/active setup or an active/passive setup.

stay away from raid-5! check out the performance difference with utilities
such as bonnie++ (free software, look on sourceforge.net)

always test various configurations for the best performance. be prepared to
be shocked as most vendor claims are WAY exaggerated. my desktop ultra-10
can outperform (single file sequential read/write) even the fiber disk
arrays on our E6000 with 73gb 10k RPM drives. my Mac cube has the fasted
drive I've tested so far. A 1+0 (a mirror of strips, not a stripe of
mirrors) on a Dell PE-6450 running RedHat is the fastest I/O server I've
tested. Large hardware RAID such as EMC, STK, and Sun Axxxx are ridiculously
slow. I haven't tested Shark, but hear that it's even slower.

What is everyone else's experience?

..John..

-----Original Message-----
From: Zaleski,
Sent: Monday, September 30, 2002 1:36 PM
To: LazyDBA.com Discussion
Subject: RE: Unix - disk configuration


Does anyone know if it is possible in a RAID 10 configuration to read off a
disk's mirror simultaneously if the primary is operational? I thought I had
heard that a while back from our Sun consultant, that this 2x the read
throughput.

Alex
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