cause of IO wait

[der.hans]

Am 27. Jun, 2011 schwätzte Lisa Kachold so:

moin moin,

> What version is your 3ware firmware?  That's fairly important, you realize?

There is an update we'll apply when I can schedule some downtime for the
server.

> For instance, try reducing the queue depth of the 3Ware driver:
>
> can_queue from 254 to 30
> command_per_lun from 254 to 4

I'll look into these. We only have a couple of 3ware cards in place, but
making them more efficient is a good idea.

ciao,

der.hans
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