# Dell EMC Isilon/PowerScale

The Commvault software uses the Dell EMC Isilon/PowerScale Changelist API for faster incremental backups.

When you have a large number of files to back up in a data set, even if only a few files were modified, regular file system incremental backups scan all the files to check for changes, which takes a large amount of time.

Changelist tracks the changes made to files between snapshots. When you run an incremental backup, only the files that changed are scanned, so the backup is faster.

Note

Starting in Commvault Feature Release (11.24), for Dell EMC Isilon/PowerScale, Changelist scan is automatically enabled for newly created sub-clients. If you want to enable changelist scan for old sub-clients, contact Commvault support.

## Optimized Backup of Hard Link Files

To enable optimized backup of hard link files for NFS Exports, see Configuring Optimized Backups for Hard Links.

## Supported Versions

Dell EMC Isilon/PowerScale OneFS version 8.2.0.0 and more recent versions.

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