Symantec NETBACKUP 7 - Manual (Page 52)

Table 5-2 Media server deduplication pool properties (continued)
Description Property
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.
Limit I/O streams
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.
per volume
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 NetBackup Management > Storage
> Storage Units window of the Administration Console.
To configure a storage unit from the Actions menu
1 In the NetBackup Administration Console, expand NetBackup Management
> Storage > Storage Units.
2 On the Actions menu, select New > Storage Unit.
3 Complete 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.
Configuring deduplication
Configuring a deduplication storage unit 52