You can reduce the fragmentation of data on a mount path by enabling the Reduce fragmentation by growing the backup chunk by n MB option. This will pre-allocate the space on the mount path for a write operations resulting in reduced fragmentation which in turn will speed-up read operations (auxiliary copy, restore operations) from the disk. This option is supported only for Windows MediaAgents.
Fragmentation levels in the mount path can be analyzed using the Fragmentation Analysis feature.
Procedure
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From the CommCell Browser, expand to Storage Resources | Libraries | <Library> | <Mount Path>.
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Right-click the appropriate mount path, and then click Properties.
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Click the Allocation Policy tab.
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In the Fragmentation section, make sure that the Minimize fragmentation by allocating write blocks of n MB check box is selected and set the size that must be pre-allocated for each write operation in the box. (This option is selected by default and the default size is 128 MB.)
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Click OK.