Table 4-2
Preferred or required read server descriptions
DescriptionServer
attribute
The server is preferred for the read side of restore operations. You can
configure more than one server as preferred for restore.
If you configure preferred for restore but not required for restore,
NetBackup considers preferred storage servers for jobs first. If none are
available, NetBackup considers any configured storage server.
Normal NetBackup load balancing occurs among all storage servers
marked PrefRestore.
PrefRestore
The server is required for the read side of restore operations. You can
configure more than one server as required for restore.
If you configure required servers for restore but not preferred servers,
jobs queue until a required server is available to execute the job. Other
servers are never considered for restore jobs. Normal NetBackup rules
for job retry apply.
If you configure both preferred and required storage servers and a
required server is not available, NetBackup considers preferred servers
for jobs. If none are available, jobs queue until a required or preferred
server is available. Other servers are never considered for restore jobs.
Normal NetBackup load balancing occurs for all required servers. Load
balancing does not occur between the required and preferred servers.
ReqRestore
The server is required for the read side of duplication operations. You
can configure more than one server as required for duplication.
If any server is configured as required for duplication, NetBackup
considers only required for duplication servers for jobs. If a required
server is unavailable, jobs queue until a required server is available to
execute the job. Normal NetBackup rules for job retry apply.
Required for duplication also applies to storage server allocation for
synthetic backup operations.
ReqDuplicate
Only the media servers that are configured in the storage unit are considered for
jobs. Therefore, if you configure a subset of the disk pool media servers in a storage
unit, NetBackup selects from those servers only.
If you use the preferred or required restore or duplication attributes for a storage
server, the following may occur:
■ A restore operation uses a storage server that does not have a PrefRestore
or ReqRestore attribute. Reasons may be as follows:
25Configuring AdvancedDisk
About AdvancedDisk preferred or required read servers
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