# Network Share Performance Numbers

When you use the Changelist feature for Dell EMC Isilon/PowerScale, a considerable reduction of more than 50 percent of the time taken for file scan operations is seen.

There is also a considerable reduction of CPU usage when you run Changelist backups compared to the CPU usage of a regular file system backup.

## Job Results Directory Disk Space Requirements

You require a minimum of 4 GB of disk space for approximately 25 million files. For more information on calculating the disk space, see Job Results Directory Disk Space Calculation.

## Data set for CIFS Shares (Windows)

The following table compares performance metrics of file scan time for a regular file system backup versus file scan operations that use the Changelist feature for Dell EMC Isilon/PowerScale.

Folder count: 15621
File count: 12 million files

Total number of modifications: 49745

File Scan Operation | Full Backup (Time taken in minutes) | Incremental backup (Time taken in minutes)
--- | --- | ---
File system scan using the Changelist feature for Dell EMC Isilon/PowerScale | 29:51 | 01:24
Regular file system scan | 14:34 | 19:53

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