Hoot, Joseph wrote:
> Hi all,
>
> I'm trying to understand what I'm seeing in my /var/log/messages. Here's
> what I have:
>
> Nov 13 10:49:47 oim6102506 kernel: connection5:0: ping timeout of 10 secs
> expired, last rx 191838122, last ping 191839372, now 191841872
> Nov 13 10:49:47 oim6102506 kernel: connection5:0: detected conn error (1011)
> Nov 13 10:49:47 oim6102506 iscsid: Kernel reported iSCSI connection 5:0 error
> (1011) state (3)
> Nov 13 10:49:50 oim6102506 iscsid: Login authentication failed with target
> iqn.2001-05.com.equallogic:0-8a0906-e7d1dea02-786272c42554aef2-ovm-2-lun03
> Nov 13 10:49:52 oim6102506 iscsid: connection5:0 is operational after
> recovery (1 attempts)
>
> the first line, what is "connection5:0"? is that referenced from iscsiadm
> somewhere? I only ask because I'm seeing iscsid messages and kernel messages.
> I also have dm-multipath running, which usually shows up as dm-multipath or
> something like that. I understand that iscsid is the process that is logging
> in and out. But is the "kernel:" message just an iscsi modules that is
> loaded into the kernel, which is why it is being logged as "kernel:"?
>
It is the session id and connection id.
connection$SESSION_ID:$CONNECTION_ID
If you run iscsiadm -m session -P 1 or -P 3
You will see
#iscsiadm -m session -P 1
Target: iqn.1992-08.com.netapp:sn.33615311
Current Portal: 10.15.85.19:3260,3
Persistent Portal: 10.15.85.19:3260,3
Iface Transport: tcp
Iface IPaddress: 10.11.14.37
Iface HWaddress: default
Iface Netdev: default
SID: 7
iSCSI Connection State: LOGGED IN
Internal iscsid Session State: NO CHANGE
Session number is the SID value.
If you run
iscsiadm -m session
tcp [2] 10.15.84.19:3260,2 iqn.1992-08.com.netapp:sn.33615311
the session number/SID is the value in brackets.
If you run iscsiadm in session mode (iscsiadm -m session) then you can
use the -R argument and pass in a SID to do an opertaion like
iscsiadm -m session -R 2 --rescan
would rescan that session.
Connection number is currently always zero.
For the second question, iscsid handles login and logout, and error
handling, and the kernel basically passes iscsi packets around.
Nov 13 10:49:47 oim6102506 kernel: connection5:0: ping timeout of 10
secs expired, last rx 191838122, last ping 191839372, now 191841872
so here the iscsi kernel code sends a iscsi ping/nop every noop_interval
seconds, and if we do not get a response withing noop_timeout seconds it
will fire off a connection error.
Nov 13 10:49:47 oim6102506 kernel: connection5:0: detected conn error
(1011)
Here is the kernel code notifying userspace of the problem.
Nov 13 10:49:47 oim6102506 iscsid: Kernel reported iSCSI connection 5:0
error (1011) state (3)
And there iscsid is accepting the error (probably no need for the error
to be logged twice).
Nov 13 10:49:50 oim6102506 iscsid: Login authentication failed with target
And then here iscsid handled the error by killing the tcp/ip connection,
reconnection the tcp/ip connection, and then re-logging into the iscsi
target. But for some reason we could not log back in right away.
iqn.2001-05.com.equallogic:0-8a0906-e7d1dea02-786272c42554aef2-ovm-2-lun03
Nov 13 10:49:52 oim6102506 iscsid: connection5:0 is operational after
recovery (1 attempts)
But it looks like we tried again and we got back in.
> Maybe one of these modules?
> iscsi_tcp 19785 46
> libiscsi_tcp 21829 1 iscsi_tcp
> libiscsi2 41285 3 ib_iser,iscsi_tcp,libiscsi_tcp
> scsi_transport_iscsi2 37197 5 ib_iser,iscsi_tcp,libiscsi2
> scsi_transport_iscsi 6085 1 scsi_transport_iscsi2
>
> I'm just trying to make sure that all of my timeout values line up properly
> so that, for example, OCFS2 filesystem doesn't timeout prior to iSCSI. I'd
> rather verify that iSCSI reconnections are attempted every 10 seconds and
> then dm-multipath has 30 seconds to timeout and then OCFS2 has 60 seconds
> before it times out (or something along those lines). So if I understand the
> logging a bit more, it'll help me.
>
> Thanks
> Joe
>
>
> ===========================
> Joseph R. Hoot
> Lead System Programmer/Analyst
> (w) 716-878-4832
> (c) 716-759-HOOT
> [email protected]
> GPG KEY: 7145F633
> ===========================
>
>
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