On Mon, 2009-04-13 at 15:44 -0500, Mike Christie wrote:
> Matthew Kent wrote:
> > Can anyone suggest a timeout I might be hitting or a setting I'm
> > missing?
> > 
> > The run down:
> > 
> > - EqualLogic target
> > - CentOS 5.2 client
> 
> You will want to upgrade that to 5.3 when you can. The iscsi code in 
> there fixes a bug where the initiator dropped the session when it should 
> not.
> 

Will do, probably Wednesday night and we'll see if this goes away. I'll
be sure to follow up for the archives.

> > - xfs > lvm > iscsi
> > 
> > During a period of high load the EqualLogic decides to load balance:
> > 
> >  INFO  4/13/09  12:08:29 AM  eql3    iSCSI session to target
> > '20.20.20.31:3260,
> > iqn.2001-05.com.equallogic:0-8a0906-b7f6d3801-2b2000d0f5347d9a-foo' from
> > initiator '20.20.20.92:51274, iqn.1994-05.com.redhat:a62ba20db72' was
> > closed.   Load balancing request was received on the array.  
> 
> 
> So is this what you get in the EQL log when it decides to load balance 
> the initiator and send us to a different portal?
> 

Yes, a straight copy from event log in the java web interface.

> 
> > 
> >  INFO  4/13/09  12:08:31 AM  eql3    iSCSI login to target
> > '20.20.20.32:3260,
> > iqn.2001-05.com.equallogic:0-8a0906-b7f6d3801-2b2000d0f5347d9a-foo' from
> > initiator '20.20.20.92:44805, iqn.1994-05.com.redhat:a62ba20db72'
> > successful, using standard frame length.  
> > 
> > on the client see I get:
> > 
> > Apr 13 00:08:29 moo kernel: [4576850.161324] sd 5:0:0:0: SCSI error:
> > return code = 0x00020000
> > 
> > Apr 13 00:08:29 moo kernel: [4576850.161330] end_request: I/O error, dev
> > sdc, sector 113287552
> > 
> > Apr 13 00:08:32 moo kernel: [4576852.470879] I/O error in filesystem
> > ("dm-10") meta-data dev dm-10 block 0x6c0a000
> 
> Are you using dm-multipath over iscsi? Does this load balance issue 
> affect all the paths at the same time? What is your multipath 
> no_path_retry value? I think you might want to set that higher to avoid 
> the FS from getting IO errors at this time if all paths are affected at 
> the same time.
> 

Not using multipath on this one.

> I am not sure how to config the EQL box to not load balance or load 
> balance at different thresholds.
> 

Yeah I haven't ever seen anything in the manual or gui related to
configuring the load balancing, it seems to want to just to it whenever
it wants. Though I imagine if I pulled all but one network line it would
stop ;)

Thanks for the quick reply.
-- 
Matthew Kent \ SA \ bravenet.com


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