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12-8 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
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The procedure for estimating the amount of backup data depends on whether the filer
is mounted on an NFS client or is shared by a CIFS client.
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Follow these steps to determine the amount of backup data from an NFS client:
1. On the NFS client, change directory to the mount point.
2. Enter the following command for each directory you want to back up:
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Example: If the NFS client mounts the filer to /filer and you want to back up the
/etc and /home directories, enter these commands:
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The command output shows the amount of space allocated for the directories.
Refer to the documentation for your client system for interpreting the output
because the output is written in different units (for example, 512-byte units or
1,024 units) depending on the operating system.
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Follow these steps to determine the amount of backup data from a CIFS client:
1. On the CIFS client, point to the shared file or director y that you want to back up.
2. Right-click to display the pull-down menu.
3. Click Properties to display the number of bytes used by the file or directory.
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You must determine the number of tapes required for the backup before entering the
dump command for these reasons:
You can ensure that the dump command will not run out of tapes and be
incomplete.
You can load all tapes required in the tape drives or stackers in advance for an
unattended backup. If you do not load enough tapes before entering the
dump
command and you start the dump command from the console, the filer prompts