On 01/30/2014 09:22 PM, Markus Stockhausen wrote:
Von: users-bounces@ovirt.org [users-bounces@ovirt.org]" im Auftrag von "Markus Stockhausen [stockhausen@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.