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[Xen-devel] RE: PV resume failed after self migration failed

To: "MaoXiaoyun" <tinnycloud@xxxxxxxxxxx>, "xen devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] RE: PV resume failed after self migration failed
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Fri, 17 Jun 2011 11:34:09 +1000
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Thread-topic: PV resume failed after self migration failed
> Hi James:
>     I found another issue during test.
>     When migrating VM from host A to B, it contains following process.
>     1) memory copy
>     2) suspend VM on A
>     3) transfer some other thing to B such as tsc state.
>     If step (3) failed,  VM will be resumed on host A.
>     Well, from the test of view,  the resume cannot be completed
>     Out test is migrating 12VMs between twn host over again and again.
>     The attached log doing exactly below things
>     1) Migrate from Host B, so fisrt resuming (line 25 to 474)
>     2) Later want to migrating to B again, so suspending (line 474 to
> 1116)
>     3) Migrating failed and enter into resuming again  (line 1118 to
> 1399).
>      line 1383 is waiting vbd state to be changed but can not get the
> response.
> And 1392 show a "Unacknowledged event word ". From the log, it looks
> this is due to XenVbd_HwScsiResetBus in line 1397.
>       Question is what trigger the XenVbd_HwScsiResetBus during

Windows will invoke a scsi reset if a request takes too long to complete
(5 seconds I think). It will also issue a reset when a crash dump
starts, just to make sure all previous requests are flushed etc.


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