Vladislav Bolkhovitin wrote:
Cameron Harr, on 01/09/2009 02:10 AM wrote:
Also, I think my original question got lost in the main thread, which
was to find out why I could get double the performance exporting two
drives over SCST/SRP as opposed to raiding those two drives and
exporting them as one object.
Hmm, I can't see where you asked it. I checked your original e-mail
and didn't find it.
You're absolutely right. Looking back at the original email, I didn't
really say the question. I had tried debugging the issue on my own and
determined interrupts were the problem and made that be my question. I
never got back to asking the base question.
Anyway, can you repeat your question? Unfortunately, from the above I
can't understand it.
Back when I started the thread, I had the problem where performance
seemed to follow the number of devices exported instead of the
performance of the devices themselves. Specifically, I had two drives on
a local box. If I did a RAID 0 on those two drives and exported them,
I'd get performance X. However, if I exported both of the drives as
individual drives, my performance was close to 2X.
Just now, running with recent code, I ran a battery of tests to verify
with real numbers, and to my pleasant surprise, the issue (which had
been verified by multiple people at my work) seems to have vanished. I'm
now getting equal performance out of 1 2-drive RAID SRP target as I am
out of 2 independent SRP targets. So, congrats - you fixed my problem!
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