Re: errors from mptsas

[Wakko Warner <wakko@animx.eu.org>]

Moore, Eric wrote:
> On Wednesday, April 09, 2008 4:54 AM,  Rick Warner wrote:
> > 
> > Join the club.  I have an LSI SAS with 3x 750gb seagate sata drives in
> > raid5.  Does this happen only on your SATA drives or all the drives?
> > Depending on the activity, it would drop one of them out of the
> > array.  I think the problem has been solved for now by changing the
> > queue_depth to 1.
> > 
> > echo 1 > /sys/block/sdX/device/queue_depth
> > 
> > Here's the drives in my system:
> > [0:0:0:0]    disk    ATA      ST3750640AS      E     /dev/sda
> > [0:0:1:0]    disk    ATA      ST3750640AS      E     /dev/sdb
> > [0:0:2:0]    disk    ATA      ST3750640AS      E     /dev/sdc
> > 
> 
> 
> Rick - I thought you said the magic number was 32 for SATA devices?  And
> we confirmed that in the logs you sent yesterday.   Is that correct, or
> did I miss something.

That was ment for me.
>From what I read, the number is 31 for sata drives (I'm not sure about sas
and not sure if it relates to sata drives on a sas controller).
However, I set mine to 1 specifically and have not had a problem.  I'd
rather not try 31 and a drive drop out again.  It takes 4 hours to rebuild
the array and I've had to do it with the system offline.

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