Migration fails with error: pmm utility 'migration_handler' raised an exception. Error code is: -9

Refers to:

  • Plesk 11.5 for Linux
  • Plesk 12.0 for Linux

Created:

2016-11-16 12:53:06 UTC

Modified:

2016-12-21 19:27:10 UTC

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Migration fails with error: pmm utility 'migration_handler' raised an exception. Error code is: -9

Symptoms

A migration fails after you select the Objects To Transfer , the following error is being shown:

Error: pmm utility 'migration_handler' raised an exception. Error code is: -9
See pmmcli.log to find out detailed information on this

Cause

Out of memory issue. The migration process ( migration-handler in particular) was killed by OOM Killer.

Resolution

If you have Virtuozzo containers, to make sure that the process was killed by OOM Killer, please check the hardware node logs:

dmesg | egrep -i 'killed process'

To workaround the issue please adjust container's UBC resources , in particular try to increase kmemsize - size of unswappable memory in bytes, allocated by the operating system kernel.

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