[OpenIndiana-discuss] sata hba choice

[Timothy Coalson]

On Sat, Aug 25, 2012 at 1:56 PM, Sašo Kiselkov <skiselkov.ml at gmail.com> wrote:
> On 08/25/2012 03:42 PM, Jordan McQuown wrote:
>> I can say from experience chaining supermicro sas chassis with any type of disk can be a recipe for disaster. Lsiutil reported a couple million errors in a couple months time which eventually led to some sort of contention and corruption on both sides of our mirrors. These were also SAS and not sata disks.
>
> Have you checked your SAS cabling? Also, lsiutil is for lsi1068 (3G) SAS
> chips. I've got a SuperMicro SC847 attached to a pair of lsi
> sas2008-based boards. The chassis is internally arranged as a pair of
> backplanes, each with two LSI SAS2x36, chained to appear as a single
> connector from the back of the chassis (i.e. one connector per SAS
> channel bundle for two fully redundant paths to the drives). Initially I
> was having trouble with excessive link errors which resulted in poor
> performance, lots of errors and generally lots of problems, but I found
> this was caused by a faulty SAS cable between the host and the chassis.
> Ever since playing around with cabling a bit it's been ticking reliably
> like a Swiss clock.
>

Good to know it is working for you, that is precisely the kind of
setup I was considering.  Did I understand you correctly that even
with redundant paths to each drive, a single poor connection, despite
a secondary good connection, caused serious performance problems?

Thanks for the replies.

Tim