12-12 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
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Attach the maximum number of tape drives to the filer. The filer can write faster to a
local tape drive than to a tape drive attached to another system.
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The first two passes of the dump command run faster if the dump path is one of
these:
A volume
A qtree
Data not belonging to any qtrees
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Limit the amount of data in a volume or qtree to be backed up to 200 GB.
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Schedule backups when the load on the filer is light. Refer to Example of Backing up
the Entire Filer for an example of executing one full backup and several incremental
backups a night.
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If you exclude certain files from the backup, the dump command takes longer
because it must compare each file name to the strings in the exclude list to determine
whether it should back up the file.
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The method used for restoring data has a greater effect on downtime than does the
dump command. However, it helps to keep the data in the dump path to 100 GB or
less because a full restore is more efficient than a partial restore. For example, it takes
less time to restore an entire 100-GB qtree than to extract 100 GB of data from a
500-GB backup.
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Because the filer supports the rmt protocol, several filers can share the same tape
drive. Attach the tape drive to the filer with the most data to back up. Follow these
guidelines if multiple filers back up to the same tape drive:
Use a private network for the backup so that the traffic load on the network does
not slow down the backup process.
Schedule the dump command on each filer so that it starts only when no other
filers are using the tape drive.