Article ID: 123050, created on Oct 3, 2014, last review on Jun 17, 2016

  • Applies to:
  • Virtuozzo 6.0


During online migration of a virtual machine, its prl_vm_app process on the target node consumes more memory than it is assigned to this VM, and after some time the migration operation is canceled due to out-of-memory (OOM) situation.

For example, migrating a VM with 24 GB RAM, it can be like the following before migration interrupting:

[root@node ~]$ free -m
             total       used       free     shared    buffers     cached
Mem:         64228      64060        167          0          2        151
-/+ buffers/cache:      63906        321
Swap:        16383      16383          0

After canceling:

[node@node ~]$ free -m
             total       used       free     shared    buffers     cached
Mem:         64228       4778      59449          0         39       1347
-/+ buffers/cache:       3391      60836
Swap:        16383        413      15970

The following error could be founded in the system log /var/log/messages:

Sep 23 13:13:18 kernel: [336719.262854]
Out of memory: OOM killed process 1374 (prl_vm_app) score 0 vm:215154152kB, rss:62621660kB, swap:16469268kB


This case was recognized as a product issue with the ID #PSBM-29109


The fix will be included in the future updates of the Parallels Cloud Server.

Search Words


Out of memory: OOM killed process

online migration canceled

(prl_vm_app) score

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