On Wed, May 28, 2008 at 10:16:40AM -0400, Konrad Rzeszutek wrote:
> 
> On Wed, May 28, 2008 at 03:34:37PM +0300, Pasi Kärkkäinen wrote:
> > 
> > Hello list!
> > 
> > Unfortunately I had to upgrade a server running CentOS 4.6 (sfnet 
> > initiator) 
> > to CentOS 5.1 (open-iscsi initiator) and now I have some problems with it
> > (then again I was expecting it.. I hate this Promise array).
> > 
> > /var/log/messages:
> > 
> > May 28 15:14:16 server1 multipathd: path checkers start up
> > May 28 15:15:39 server1 iscsid: Nop-out timedout after 10 seconds on 
> > connection 14:0 state (3). Dropping session.
> > May 28 15:15:42 server1 iscsid: connection14:0 is operational after 
> > recovery (2 attempts)
> > May 28 15:19:21 server1 kernel: sd 16:0:0:0: SCSI error: return code = 
> > 0x00020000
> > May 28 15:19:21 server1 kernel: end_request: I/O error, dev sdd, sector 
> > 190057296
> > May 28 15:19:21 server1 kernel: device-mapper: multipath: Failing path 8:48.
> > May 28 15:19:21 server1 kernel: sd 16:0:0:0: SCSI error: return code = 
> > 0x00020000
> > May 28 15:19:21 server1 kernel: end_request: I/O error, dev sdd, sector 
> > 190057552
> > May 28 15:19:21 server1 kernel: sd 16:0:0:0: SCSI error: return code = 
> > 0x00020000
> > May 28 15:19:21 server1 kernel: end_request: I/O error, dev sdd, sector 
> > 190057560
> > May 28 15:19:21 server1 multipathd: sdd: readsector0 checker reports path 
> > is down
> > May 28 15:19:21 server1 multipathd: checker failed path 8:48 in map 
> > promise_test1
> > May 28 15:19:21 server1 multipathd: promise_test1: remaining active paths: 1
> > May 28 15:19:21 server1 iscsid: Nop-out timedout after 10 seconds on 
> > connection 14:0 state (3). Dropping session.
> > May 28 15:19:25 server1 iscsid: connection14:0 is operational after 
> > recovery (2 attempts)
> > May 28 15:19:26 server1 multipathd: sdd: readsector0 checker reports path 
> > is up
> > May 28 15:19:26 server1 multipathd: 8:48: reinstated
> > May 28 15:19:26 server1 multipathd: promise_test1: remaining active paths: 2
> > May 28 15:19:26 server1 multipathd: promise_test1: switch to path group #1
> > 
> > $ iscsiadm -m node --targetname <name> | grep timeo 
> > node.session.timeo.replacement_timeout = 15
> > node.session.err_timeo.abort_timeout = 10
> > node.session.err_timeo.reset_timeout = 30
> > node.conn[0].timeo.logout_timeout = 15
> > node.conn[0].timeo.login_timeout = 15
> > node.conn[0].timeo.auth_timeout = 45
> > node.conn[0].timeo.active_timeout = 5
> > node.conn[0].timeo.idle_timeout = 60
> > node.conn[0].timeo.ping_timeout = 5
> > node.conn[0].timeo.noop_out_interval = 5
> > node.conn[0].timeo.noop_out_timeout = 10
> > node.session.timeo.replacement_timeout = 15
> > node.session.err_timeo.abort_timeout = 10
> > node.session.err_timeo.reset_timeout = 30
> > node.conn[0].timeo.logout_timeout = 15
> > node.conn[0].timeo.login_timeout = 15
> > node.conn[0].timeo.auth_timeout = 45
> > node.conn[0].timeo.active_timeout = 5
> > node.conn[0].timeo.idle_timeout = 60
> > node.conn[0].timeo.ping_timeout = 5
> > node.conn[0].timeo.noop_out_interval = 5
> > node.conn[0].timeo.noop_out_timeout = 10
> > 
> > Basicly those "Nop-out timedout" errors keep showing up all the time when
> > there is IO going on.. and if I have "dd if=/dev/mpath of=/dev/null" 
> > running 
> 
> You can expand the timeout to a higher value? 30 seconds ? Also you might
> want to limit the node.session.queue_depth to a lower value as well.
> 

I tried this.. doesn't seem to help much. I still get the same errors. 

I'll try limiting queue depth too.. 

> > IO rates seem to go down every 20 seconds or so and stay stalled (at 0) for 
> > 5 seconds or so.. weird.
> 
> That could be due to the NOP not getting its response and stalling the session
> until it receives the response.
> 

Ok.. that would explain it.

I haven't had any problems with the Equallogic target so it has to be
something to do with Promise.. 

-- Pasi

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