Mike Christie wrote:
> Ken A wrote:
>> Mike Christie wrote:
>>> Ken A wrote:
>>>> Yes, thanks, turning off nops helped with some of the timeouts. The
>>>>  mkfs succeeded (very slowly), with this block of errors repeating 
>>>> in the log (see below).
>>>>
>>>> I should mention that this is on a asynchronous link, (100mbps 
>>>> initiator <-> 1000mbps target). The initiator is running Fedora 8, 
>>>> 2.6.25.6-27.fc8, open-iscsi 2.0-865.
>>> Are you using the tools and kernel modules from 2.0-865? Or the iscsi
>>>  kernel modules from 2.6.25.6-27.fc8 and tools from the rpm?
>>>
>>> If you did a make and make install with open-iscsi 2.0-865 from 
>>> open-iscsi.org then you are using the tools and kernel modules from 
>>> the open-iscsi.org.
>>>
>>>
>>>> Target is Wasabi Storage Builder.
>>>>
>>>> Any ideas?
>>> Is there anything on the target logs?
>>>
>>> With a 100 mbs link we might have been sending too much IO, but I 
>>> would have expected to see some messages about scsi commands timing 
>>> out and host resets firing. You can try setting these in iscsid.conf:
>>>
>>>
>>>
>>> node.session.cmds_max = 16 node.session.queue_depth = 8
>>>
>> Running open-iscsi from open-iscsi.org rather than iscsi-initiator-utils
>> seems to have fixed the problem on one Initiator.
>> Thanks very much for your help!
>> Ken
>>
>>
> 
> Are you running iscsi-initiator-utils with nops on or off? And what 
> version of iscsi-initiator-utils? iscsi-initiator-utils is actually the 
> open-iscsi userspace tools.

We are running the software from the open-iscsi website 
(open-iscsi-2.0-869.2.tar.gz) -  Not the fedora package.

nops are off, and I'm playing with node.session.cmds_max and 
node.session.queue_depth to find a good balance.

The issue I was having seems to have been related to the async 
connection causing too much I/O or triggering some kernel bug. The 
unfortunate result was a complete lockup of the Initiator machine 
requiring a reboot with the defaults in iscsid.conf.

The problem went away when I turned off nops, reduced queue depth and 
cmds max and used the open-iscsi-2.0-869.2.tar.gz source.

Thanks again for your assistance,

Ken


> 
> 
> > 


-- 
Ken Anderson
Pacific.Net


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