isp issues on recent -STABLE

[Eric Anderson]

On 08/14/06 06:35, Eric Anderson wrote:
> On 08/14/06 03:59, Geoff Buckingham wrote:
>>>>> 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.
>>>>>
>> Curiosity just lead me to the acnc website. The html data-sheets suggest
>> the arrays support 253 commands, the PDFs 255! It also reads to me as if
>> this is per FC port not per LUN. You will presumably have better 
>> informaton with whatever documentation these devices shipped with. 
> 
> 
> *sigh* - I was going by what I was told on the phone by one of their 
> support people.  I trust the lowest number :)
> 
> I see that now too.  I'll try setting that lower (80 should be good for 
> each of the three LUNs per array).
> 
> Thanks everyone for the hints/help - I'll report back once I know if 
> that made any difference.
> 
> Eric
> 
> 


After setting the tag queue depth down, things seem much more stable. 
Seems like the default should be a bit lower that 256, since very few 
targets can provide 256 apparently.

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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