Symantec 7 manual Configuring a deduplication storage unit, Per volume

52Configuring deduplication

Configuring a deduplication storage unit

Table 5-2	Media server deduplication pool properties (continued)
Property	Description

Limit I/O streams Select to limit the number of read and write streams (that is, jobs) for each volume in the disk pool. A job may read backup images or write backup images. By default, there is no limit. If you select this property, also configure the number of streams to allow per volume.

	When the limit is reached, NetBackup chooses another volume
	for write operations, if available. If not available, NetBackup
	queues jobs until a volume is available.
	Too many streams may degrade performance because of disk
	thrashing. Disk thrashing is excessive swapping of data between
	RAM and a hard disk drive. Fewer streams can improve
	throughput, which may increase the number of jobs that complete
	in a specific time period.
per volume	Select or enter the number of read and write streams to allow per
	volume.
	Many factors affect the optimal number of streams. Factors include
	but are not limited to disk speed, CPU speed, and the amount of
	memory.

Configuring a deduplication storage unit

Create one or more storage units that reference the disk pool.

The Disk Pool Configuration Wizard lets you create a storage unit; therefore, you may have created a storage unit when you created a disk pool. To determine if storage units exist for the disk pool, see the NetBackupManagement>Storage

>Storage Units window of the Administration Console.

To configure a storage unit from the Actions menu

1In the NetBackupAdministrationConsole, expand NetBackupManagement > Storage > Storage Units.

2On the Actions menu, select New > Storage Unit.

3Complete the fields in the New Storage Unit dialog box. See “Deduplication storage unit properties” on page 53.

See “Deduplication storage unit recommendations” on page 54.