Commvault works best with Dell EMC Data Domain disk libraries if you minimize how often Commvault accesses the disk library.
Note
To use deduplication, you must enable DD Boost. For instructions, see Can I configure Data Domain Boost (DD Boost) on Disk Libraries using Dell EMC® Data Domain®?.
Apply the following recommended settings to each MediaAgent associated with the disk library:
Prevent Data Pruning During Peak Backup Times
This procedure prevents physical pruning of data during peak backup times. However, it provides enough time for pruning to run outside of the peak times so that the disk library does not run out of space.
For information on creating operation rules in a Blackout window, see Setting Operation Rules in a Blackout Window.
Minimize the Number of Volumes on the MediaAgent and the Frequency of Volume Size Updates
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On the ribbon in the CommCell Console, click the Storage tab, and then click Media Management.
The Media Management Configuration dialog box appears.
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On the Service Configuration tab, set both of the following parameters:
Note
If you have upgraded from V 9.0 to the current version, the Interval between volume size update requests and the Number of volumes for size update parameters are available on the Data Aging tab.
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For Number of volumes for size update, type 50.
You can use a value other than 50, but it should be a small value.
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For Interval between volume size update requests, type 2880.
The value 2880 minutes = 2 days.
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Click OK.
Prevent SMB/CIFS Session Leaks on the Windows Operating System
In addition to the recommended settings for each MediaAgent, consult the following Microsoft Knowledge Base article:
"SMB/CIFS sessions leak in Windows Vista, in Windows Server 2008, in Windows 7 and in Windows Server 2008 R2", http://support.microsoft.com/kb/2537589
Setup the Necessary Permissions for Accessing NFS Exports
While using data domain storage as NFS exports, enable the Map root users to anonymous UID/GID (root_squash) option from the DataDomain Console. This will prevent Auxiliary Copy and Data Aging jobs running on the Data Domain mount path from failing with 'permission denied' errors.
Mount with nolock Option
You must mount with the nolock option when you create the mount path on a device.
Deduplication with NFS Export
When using Commvault deduplication with NFS export, use NFS version 4 (NFSv4). Although Commvault software supports both NFSv3 or NFSv4, Data domain does not support NFSv3 with NLM.