Linux backup job succeeds with exception but copies only the NFS mount point structure

Problem

It is observed on some Linux distributions such as OEL and Asianux, sometimes the backup succeeds with exception copying only the NFS mount point structure without backing up the files inside it.

Error Message

Job Completion Status: Completed with exceptions

Cause

Unexpected behavior of NFS locking

Solution

First workaround is to take a backup of the NFS mounted files without the file locks. Perform the following steps to disable the file locks:

1.       Click the Backup Exec home button, select Configuration and Settings > Job Defaults > Back Up to Disk.
2.       On the Backup Job defaults window, select Linux and Macintosh.
3.       Clear the Lock remote files to prevent applications from modifying them during backup option.
4.       On the Backup Job defaults window, select Files and Folders.
5.       In the Non-Snapshot Backups section, select the Without a lock option.
6.       Click OK.

Second workaround is to back up NFS mounted files with NFS locking enabled. Perform the following steps to resolve the NFS locking issue in most cases:

1.       Add the IP address and hostname of the NFS-client in the NFS -server /etc/hosts file.
2.       Add the IP address and hostname of the NFS -server in NFS -client /etc/hosts file.
3.       Restart the network services on the NFS client and the NFS server using the following command:
/etc/init.d/network restart
4.       Restart the NFS services on the NFS client and the NFS server using the following command:
/etc/init.d/nfs restart
5.       Restart the NFS locking services on the NFS client and the NFS server using the following command:
/etc/init.d/nfslock restart
 
Note that the above methods are workarounds that have resolved the NFS locking issue in our scenario.

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