The chunk size that is established at the data path level overrides the chunk sizes that are established for the various Agents.
Procedure
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From the CommCell Browser, expand Policies > Storage Policies.
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Right-click the appropriate storage policy copy, and then click Properties.
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In the Copy Properties dialog box, on the Data Paths tab, select a data path, and then click Properties.
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In the Data Path Properties dialog box, under Chunk Size section, select Use specified value, and then enter the value in MB.
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Click OK, and then click OK to close the Copy Properties dialog box.