On Fri, Feb 29, 2008 at 02:46:28PM +0000, Andrew Elwell wrote:
> We've just got a ~48TB storage box here at Glasgow. - 2*3ware cards with
> 24*1T disks on each.
> Painfully slow out of the box (it may be verifying just now - tw_cli
> unresponsive) but I discovered this snippet on the 3ware website
> gives some tuing tips. Anyone else have some to share?
The problem is that the 3ware cards are painfully slow in random
(or even semi-random) IO patterns. A google search will give you
enough information about the problems with the card. For example:
The tips on the 3ware site are mostly geared "single user" systems
and not very suitable for a SE that needs multiple transfers (btw
disabling parallel transfers helps *a lot* on the 3ware cards but
they are still painfully slow).