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xen-devel
[Xen-devel] RE: 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
successfully.
>
> 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
line
> 1116)
> 3) Migrating failed and enter into resuming again (line 1118 to
line
> 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
like
> this is due to XenVbd_HwScsiResetBus in line 1397.
>
> Question is what trigger the XenVbd_HwScsiResetBus during
resuming?
>
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.
James
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