You can use the following techniques to increase disk performance:

• Refer to the following topic on measuring disk performance.

  See Bypassing disk performance with the SKIP_DISK_WRITES touch file.

• Check the fragmentation level of the data.

  A highly fragmented disk limits throughput levels. Use a disk maintenance utility to defragment the disk.

• Consider adding additional disks to the system to increase performance.

  Multiple processes writing to the same disk/LUN create I/O contention, which can significantly slowing IO performance. Adding more disks/LUNs to reduce the I/O contention can significantly improve the overall system performance, especially if the workload is I/O intensive, such as the high number of concurrent backup streams with a relatively low deduplication ratio or a system with concurrent backup, restore, duplication or replication jobs running concurrently.

• Determine if the data transfer involves a compressed disk.

  Windows drive compression adds overhead to disk read or write operations, with adverse effects on NetBackup performance. Use Windows compression only if it is needed to avoid a disk full condition.

• Consider converting to a system with a Redundant Array of Independent Disks (RAID).

  Though more expensive, RAID devices offer greater throughput and (depending on the RAID level) improved reliability.

• Determine what type of controller technology drives the disk.

  A different system might yield better results.