Article ID: 121184, created on Apr 18, 2014, last review on Jun 17, 2016

  • Applies to:
  • Virtuozzo 6.0
  • Virtuozzo containers for Linux 4.7

Symptoms

  1. VM backups are failing sporadically with the following error message:

    Apr 07, 2014 02:26:01 PM        Operation with the Virtual Machine "test" is started    
    Apr 07, 2014 02:26:01 PM        Backing up environment test to pcsc01sn01       
    Apr 07, 2014 02:26:01 PM        Adjusting backup type (full)     
    Apr 07, 2014 02:26:02 PM        Operation with the Virtual Machine "test" is finished with errors: Can't backup VM. Unable to perform the action because the virtual machine is busy. The virtual machine is being backed up. Please try again later.  Failed
    Apr 07, 2014 02:26:02 PM        Completing the process  Failed
    
  2. The number of VMs on the server is large (up to >40 VMs).

  3. The backups work fine for some time after restarting Parallels Dispather Service (prl_disp_service).

Cause

The issue is recognized as a product bug with internal ID PSBM-26171: prl_backup_client sometimes fails to create a backup under big loads due to high number of file descriptors.

Resolution

The permanent fix is included in Parallels Cloud Server 6.0 Update 7 (6.0.7-2195).

The immediate workaround is to restart the service by killing it forcibly (this way VMs are not getting interrupted):

# kill -9 `pidof prl_disp_service`

Search Words

PAC_CN_PREM_1089_timberland

is finished with errors: Can't backup VM

Backup not able perform

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