isp issues on recent -STABLE

[Eric Anderson]

On 08/11/06 10:43, Geoff Buckingham wrote:
> On Fri, Aug 11, 2006 at 06:53:03AM -0500, Eric Anderson wrote:
>> [..snip..]
>> Aug  9 23:02:10 snapshot1 kernel: isp0: command timed out for 0.2.2
>> Aug  9 23:02:10 snapshot1 kernel: (da8:isp0:0:2:2): Command timed out
>> Aug  9 23:02:10 snapshot1 kernel: (da8:isp0:0:2:2): Retrying Command
>> Aug  9 23:26:58 snapshot1 kernel: (da3:isp0:0:1:0): Queue Full
>> Aug  9 23:26:58 snapshot1 kernel: (da3:isp0:0:1:0): tagged openings now 254
> 
> I don't what may have changed in the driver recently, but from your post
> you seem to be using the FC isp and potentially a "SAN" presenting arrays as 
> luns to you rather than JBOD on a loop or switch.
> 
> If you you have some kind of data mover presenting arrays, your SAN vendor 
> may well recomend a maximum queue size per lun (often 20-30)

I have this one host connected to a single QLogic fiber channel switch, 
which has 5 ACNC fiber channel arrays attached to it, along with a tape 
robot and tape drives.  Three of the arrays present 3 LUNs each (2TB per 
LUN), and two of them present 2 LUNs each, 4GB and 10TB - I'm not using 
these two arrays much yet, and are not really associated with the problems.

> man camcontrol, look at the tags section.
> 
> Your commands may be timing out because you have managed to queue too many 
> command (which I hope should not happen). Or.....
> 
> Your queues could be filling because your commands are timing out. Which
> would imply something is broke :-(

Strange that I've never hit this in the past, but now I seem to be 
hitting it quite often.  The vendor of the arrays says queue depth is 
256 per LUN, and that coincides with my messages above I believe.

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
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