[Users] Migration failed (previous migrations succeded)

[Itamar Heim]

On 01/30/2014 09:22 PM, Markus Stockhausen wrote:
>> Von: users-bounces at ovirt.org [users-bounces at ovirt.org]" im Auftrag von "Markus Stockhausen [stockhausen at collogia.de]
>> Gesendet: Donnerstag, 30. Januar 2014 18:05
>> An: ovirt-users
>> Betreff: [Users] Migration failed (previous migrations succeded)
>>
>> Hello,
>>
>> we did some migration tests this day and all of a sudden the migration
>> failed. That particular VM was moved around several times that day without
>> any problems. During the migration the VM was running a download.
>
> Found the reason. The memory was changing faster than the copy process
> worked. The logs show:
>
> Thread-289929::WARNING::2014-01-30 16:14:45,559::vm::800::vm.Vm::(run) vmId=`ce64f528-9981-4ec6-a172-9d70a00a34cd`::Migration stalling: dataRemaining (19MiB) > smallest_dataRemaining (9MiB). Refer to RHBZ#919201.
> ...
> Thread-289929::WARNING::2014-01-30 16:14:55,561::vm::800::vm.Vm::(run) vmId=`ce64f528-9981-4ec6-a172-9d70a00a34cd`::Migration stalling: dataRemaining (24MiB) > smallest_dataRemaining (9MiB). Refer to RHBZ#919201.
> ...
> Thread-289929::WARNING::2014-01-30 16:15:05,563::vm::800::vm.Vm::(run) vmId=`ce64f528-9981-4ec6-a172-9d70a00a34cd`::Migration stalling: dataRemaining (20MiB) > smallest_dataRemaining (9MiB). Refer to RHBZ#919201.
> ...
>
> Now I' getting serious problems. During the migration the VM was
> doing a rather slow download at 1,5 MB/s. So the memory changed
> by 15 MB per 10 seconds. No wonder that a check every 10 seconds
> was not able to see any progress. Im scared what will happen if I
> want to migrate a medium loaded system runing a database.
>
> Any tip for a parametrization?
>
> Markus
>
>
>
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>

what's the bandwidth? default is up to 30MB/sec, to allow up to 3 VMs to 
migrate on 1Gb without congesting it.
you could raise that if you have 10GB, or raise the bandwidth cap and 
reduce max number of concurrent VMs, etc.