Backup in Plesk fails: Seek out of scope of a stream cache (current cache size: 6 MB, cached data size: 6 MB, required data size: X MB)

Symptoms

• A Plesk Backup fails with the following message:

  CONFIG_TEXT: INFO: Seek out of scope of stream cache Unable to resume an interrupted upload: Seek out of scope of a stream cache (current cache size: 6 MB, cached data size: 6 MB, required data size: 7 MB): The connectivity problem: (55) Failed sending data to the peer: Last FTP request: STOR backup_2211150004.tar: Last FTP response: 150 Ok to send data
  INFO: pmm-ras finished. Exit code: 1
  ERR [panel] Unable to create the remote backup: Unable to resume an interrupted upload: Seek out of scope of a stream cache (current cache size: 6 MB, cached data size: 6 MB, required data size: 7 MB
  ): The connectivity problem: (55) Failed sending data to the peer: Last FTP request: STOR backup_2211150004.tar: Last FTP response: 150 Ok to send data

Cause

Backup needed cache size exceeds the default value.

Resolution

1. Connect to the server via SSH.

2. Edit the Plesk panel.ini file to add the following cache parameter with a higher value in the [pmm] section:

   [pmm]streamCacheSize = 24