Backup tasks can fail when under the following conditions:
- OnApp version 3.2 or later
- The disk is on an LVM datastore
- A dedicated backup server is used
- Multipath is running on the backup server
This is because multipath is trying to interfere with a temporary iSCSI connection between HV and backup server.
To resolve this issue, edit /etc/multipath.conf (on the backup server)
Add the following to the blacklist section:
Restart the multipathd service.