From: | "Sean Davis" <sdavis2(at)mail(dot)nih(dot)gov> |
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To: | pgsql-performance(at)postgresql(dot)org |
Subject: | [OT] RAID controllers blocking one another? |
Date: | 2008-01-17 20:17:08 |
Message-ID: | 264855a00801171217m4e6211e6y5f4d0e12ce86db5c@mail.gmail.com |
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Lists: | pgsql-performance |
We have a machine that serves as a fileserver and a database server. Our
server hosts a raid array of 40 disk drives, attached to two3-ware cards,
one 9640SE-24 and one 9640SE-16. We have noticed that activity on one
controller blocks access on the second controller, not only for disk-IO but
also the command line tools which become unresponsive for the inactive
controller. The controllers are sitting in adjacent PCI-express slots on a
machine with dual-dual AMD and 16GB of RAM. Has anyone else noticed issues
like this? Throughput for either controller is a pretty respectable
150-200MB/s writing and somewhat faster for reading, but the "blocking" is
problematic, as the machine is serving multiple purposes.
I know this is off-topic, but I know lots of folks here deal with very large
disk arrays; it is hard to get real-world input on machines such as these.
Thanks,
Sean
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