On Jan 17, 2008 2:17 PM, Sean Davis <sdavis2@xxxxxxxxxxxx> wrote:
> 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.
Sounds like they're sharing something they shouldn't be. I'm not real
familiar with PCI-express. Aren't those the ones that use up to 16
channels for I/O? Can you divide it to 8 and 8 for each PCI-express
slot in the BIOS maybe, or something like that?
Just a SWAG.
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
