Data Reader determines the number of parallel read operations while the data is backed up.
Procedure
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From the CommCell Browser, expand Client Computers > client > File System > backup_set.
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Right-click the subclient and then click Properties.
The Subclient Properties dialog box appears.
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In the Subclient name box, type the name of the subclient.
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On the Content tab, add the content to be backed up.
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Click Advanced.
The Advanced Subclient Properties dialog box appears.
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On the Performance tab, select one of the following options:
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Automatically use optimal number of data readers
Applies to: Windows file system agent, UNIX file system agent, Laptop agent, and multi-node agents such as Network Shares, Hadoop, GPFS, GlusterFS, and LustreFS.
When you select this option, four streams are assigned automatically for backups. For Network Share clients, the number of streams equals 4 * (number of data access nodes). For example, to calculate the number of streams for two access nodes: 4 * (2) = 8 streams.
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Number of Data Readers
Enter the number of data streams in the Number of Data Readers box.
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Select the Allow multiple data readers within a drive or mount point check box.
This option is enabled by default.
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Click OK.
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On the Storage Device tab, in the Storage Policy list, click a storage policy name to associate with the subclient.
Tip: To create a new storage policy, click Create Storage Policy and follow the instructions in the storage policy creation wizard.
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Click OK.