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