Veritas NetBackup™ Cloud Administrator's Guide

Name

The disk pool name.

Storage servers

The storage server name.

Disk volumes

The disk volume that comprises the disk pool.

Total raw size

The total raw, unformatted size of the storage in the disk pool.

The storage host may or may not expose the raw size of the storage.

Total available space

The total amount of space available in the disk pool.

Comments

A comment that is associated with the disk pool.

High water mark

The High water mark, is a threshold at which the volume or the disk pool is considered full.

Low water mark

The Low water mark is a threshold at which NetBackup stops image cleanup.

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.

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.

A starting point is to divide the Maximum concurrent jobs of all of the storage units by the number of volumes in the disk pool.

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.