[OpenIndiana-discuss] COMSTAR qlt dropping link and resetting

[Steve Gonczi]

At one time I posted a dtrace script to track txg open times.  Look for it in the forum archives or I can repost it .Some Other folks Posted Similar
Scripts ...

I would not be surprised to find a txg being open for an unusually long time when the problem happens.

That would Indicate a problem in the
Zfs disk io path. eg.  Large File deletions  with dedup Turned
 On may cause an Io Storm and that
In turn may cause your
Problem.

Steve 


On May 18, 2012, at 4:25 AM, Adrian Carpenter <tac12 at wbic.cam.ac.uk> wrote:

> We are  using one port of each of  a pair of Qlogic 2562 cards to act as a FC target for our Xen environment, we are running oi_151a4.  The other port on each card is used as an initiator to attach to some FC storage(Nexsan).  We use two Qlogic SanBoxes configured so that the Xen hypervisors have a redundant path to the FC target which provides a Storage Repository from a ZVOL.  Everything works really well as expected with good throughput,  but randomly once every couple of days simultaneously  BOTH  FC targets on the Openindiana box reset their FC connections -  this of course causes real problem in Xen environment and is not help by having redundant multipaths.
> 
> We are at a bit of a loss,  does anyone have any suggestions?
> 
> Adrian
> 
> 
> 
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