Symantec NetBackup, Manual

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In NetBackup, the SpanImages attribute specifies that backup images can span
across volumes in a disk pool. The SpanImages attribute applies to both storage
servers and disk pools.
Two reasons exist that may require you to update NetBackup to use the volume
spanning functionality, as follows:
■
Your OpenStorage vendor plug-in supports volume spanning functionality.
Volume spanning is not a trait that the vendor plug-in advertises. Therefore,
you must configure the storage server to use it explicitly.
■
You upgrade to a NetBackup release that supports OpenStorage volume
spanning from a release that does not support it.
NetBackup 6.5.4 and later support OpenStorage volume spanning. If your
vendor plug-in supports spanning and you upgrade to 7.0 from a 6.5 to 6.5.3
release, you can configure NetBackup to use volume spanning.
In both cases, set the SpanImages attribute on both the storage server and the
disk pool.
See “Setting OpenStorage storage server attributes” on page 107.
See “Updating an OpenStorage disk pool” on page 119.
About OpenStorage optimized duplication methods
If an OpenStorage disk appliance can copy the data on one appliance to another
appliance of the same type, NetBackup can use that capability. The following table
lists the duplication methods in NetBackup that can use the functionality:
Table 8-2
NetBackup OpenStorage optimized duplication methods
Description Optimized duplication method
See “About optimized duplication within the same
domain” on page 64.
Within the same NetBackup domain
See “About duplicating images to a remote
NetBackup master server” on page 65.
To a remote NetBackup domain
About optimized duplication within the same domain
With duplication to another disk appliance within the same domain, the disk
appliances manage the deduplication. The ability to duplicate backups to storage
in other locations, often across various geographical sites, helps facilitate disaster
recovery.
The following are some benefits of optimized, off-host duplication:
Planning your deployment
About OpenStorage optimized duplication methods
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