Wilton wrote:
> Hi all,
> 
> I've been running a CentOS server connected to a Promise VTrak m500i
> via open-iscsi quite successfully for over a year now.  A few days ago
> the performance plummeted on the drive and I'm seeing the following
> messages in my log file:
> 
> Jan 14 09:06:13 flax kernel: iscsi-sfnet:host7: ping timeout of 5 secs
> expired, last rx 161502341, last ping 161507
> 341, now 161512341

What kernel and open-iscsi version are you using? This looks like 
something from the open-iscsi.org test release (also in scsi-misc and in 
the future RHEL 5.1 kernel).

Did you just upgrade the kernel or tools?

Ever X seconds the initiator will send a nop to check the target. You 
can control this with the noop settings in /etc/iscsi/iscsi.conf. If it 
does not get a response it will drop the session and retry commands. It 
looks like this happened here.


> Jan 14 09:06:13 flax kernel: iscsi-sfnet:host7: Session dropped
> Jan 14 09:06:13 flax kernel: iscsi-sfnet:host7: Failing command cdb
> 0x28 task 264952 with return code = 0x20000
> <snip>
> Jan 14 09:06:13 flax kernel: iscsi-sfnet:host7: Failing command cdb
> 0x28 task 264959 with return code = 0x20000
> Jan 14 09:06:13 flax kernel: iscsi-sfnet:host7: Failing command cdb
> 0x8a task 264960 with return code = 0x20000
> Jan 14 09:06:13 flax kernel: iscsi-sfnet:host7: Waiting 2 seconds
> before next login attempt
> Jan 14 09:06:15 flax kernel: iscsi-sfnet:host7: Session established
> 

Then we were able to log back in right away.

So either there was a problem at the target/network and we did not get a 
iscsi ping response, or if you just upgraded to some new code and are 
not seeing it maybe there is a bug in there.

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