On Fri May 14 22:42:38 UTC 2010, Jeremy Chadwick wrote:
> Finally, your vmstat -i output:
>
> > # vmstat -i
> > interrupt total rate
> > irq23: atapci0 371021299 10423
>
> Good to know there's no IRQ sharing going on, but what does worry me is
> the interrupt rate (10K interrupts/second). That seems *extremely*
> high, but it also depends on what kind of disk I/O is happening on this
> system -- especially since you have 2 disks attached to the same
> controller.
I have a bunch of R300's here. From one that is using the on-board SATA
and 2 drives in a gmirror setup (very similar to the OP) after 18 hours
of uptime:
[0:2] speedtest:~> vmstat -i
interrupt total rate
irq23: atapci0 254116 3
I haven't specifically done any stress testing on this box, though I did
do a "make -j8 buildworld" during the initial gmirror synchronization. 8-}
The drives are a pair of Dell-labeled 160GB "SAMSUNG HE161HJ 1AC01121"
that shipped with the box.
I also have another R300 with Dell's "SAS 6/iR" card (a re-branded LSI
1068-something, seen as "mpt" by FreeBSD). While Dell only sells that as
part of a package deal with the hot-swap backplane and redundant power
supplies, there's no reason you couldn't pick one up on eBay and add it
yourself. You'll need some sort of breakout cable to get from the big
connector on the SAS 6 to individual SATA ports.
Terry Kennedy http://www.tmk.com
te...@tmk.com New York, NY USA
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