Plesk Migrator shows error: No space left on device

Symptoms

• Migration of a subscription fails with one of the following error messages:

  Warning: Selected filesystem at /var/www/vhosts/example.com/public_html/cgi-bin has only 0 bytes free, but 10485760 bytes are needed for operation
  Warning: hosting "example.com"
  Can not deploy web-content of domain 
  Warning:
  rsync execution error: Error in file IO (11).
  Stderr is:
  stdin: is not a tty
  rsync: write failed on "/var/www/vhosts/example.com/public_html/sms/uploaded/documents/1608527311.pdf": No space left on device (28)
  rsync error: error in file IO (code 11) at receiver.c(389) [receiver=3.1.0]

  ---

  stderr: rsync: write failed on "/root/plesk_migrator/plesk_migrator-h5ngkzbauesnepcruxeozu5txskwdzxf/pmm_agent/HelpFuncs.pm": No space left on device (28) 
  rsync error: error in file IO (code 11) at receiver.c(301) [receiver=3.0.6] 
  rsync: connection unexpectedly closed (1678 bytes received so far) [sender] 
  rsync error: error in rsync protocol data stream (code 12) at io.c(605) [sender=3.0.9]
  That is a critical error, migration was stopped.

  ---

  Attempt #3 failed with the following error:
  [Errno 28] No space left on device

• Website content and databases were not migrated or partially migrated.

• After migration of a WordPress website, it is shown as broken in WP Toolkit.

Cause

There is no free disk space available on the /var or /root partitions on the source/destination server:

# df -h | grep var
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-var 4.0G 4.0G 0 100% /var

Resolution

1. Connect to the source/destination server via SSH.

2. Clean/increase disk space on the /var or /root partition.

3. Go to Plesk Migrator and click the [Re-sync] button next to failed subscriptions.

4. In the Re-sync window, select Re-sync business objects and click OK.