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Veritas NetBackup™ Cloud Administrator's Guide

Last Published: 2019-05-14

Product(s): NetBackup (8.1.2)

Cloud storage disk pool properties

The properties of a disk pool may vary depending on the purpose the disk pool.

Note:

The following properties do not apply to cloud storage disk pools: Total available space, Total raw size, Usable Size, Low water mark, and High water mark.

All these values are derived from the storage capacity, which cannot be fetched from the cloud provider.

The following table describes the possible properties:

Table: Cloud storage disk pool properties

Property	Description
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. Note: Total raw size does not apply to cloud storage disk pools.
Total available space	The total amount of space available in the disk pool. Note: Total available space does not apply to cloud storage disk pools.
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. Note: High water mark does not apply to cloud storage disk pools.
Low water mark	The Low water mark is a threshold at which NetBackup stops image cleanup. Low water mark does not apply to cloud storage disk pools.
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. For the disk pools that are configured for Snapshot and that have a Replication source property: Always use increments of 2 when you change this setting. A single replication job uses two I/O streams. If more replication jobs exist than streams are available, NetBackup queues the jobs until streams are available. Batching can cause many replications to occur within a single NetBackup job. Another setting affects snapshot replication job batching.