Virtual Machine or Container migration fails with the following error:
Failed to migrate the VM: Failed to perform the operation. An error occurred when managing the cluster resource. Contact your system administrator for assistance.
prl_disp_service process on either source or destination nodes has 1024 or more opened files descriptors (FD):
[root@pcs ~]# lsof -p `pidof prl_disp_service` | tail -n 1 prl_disp_ 97142 root 1023w FIFO 0,8 0t0 367610848 pipe
In the output above
1023w shows that Parallels Dispatcher uses 1024 FD (count starts from 0), and it is unable to spawn 1024th file descriptor. The issue is recognized as a product bug with ID #PSBM-26422.
The permanent fix is included in Parallels Cloud Server 6.0 Update 7 (6.0.7-2195)