12-2 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
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The dump command writes file system data from disk to tape in a format that
enables you to restore the data to a filer using the filers restore command or the
Solaris ufsrestore command.

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The dump command can back up a file, a directory, a qtree, or an entire volume. In
the dump command, you specify the complete path name to be backed up. In this
chapter, this path name is referred to as the dump path.

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The dump path can exist in the filers active file system or in a snapshot. If the dump
path is in an active file system, the filer takes a snapshot of the active file system
before it writes the data to tape. The snapshot capability ensures that the data written
to tape is consistent. As a result, you need not take the filer or volume off-line before
initiating the backup.
The dump command names each snapshot it creates snapshot_for_backup.n. The n
at the end of the snapshot name is an integer starting at 0. Each time the dump com-
mand creates a snapshot, it increments the integer by 1. The filer resets the integer to
0 when it is rebooted.
The dump command automatically deletes the snapshot after it successfully finishes
the backup.
When the filer executes multiple dump commands simultaneously, the dump com-
mands create multiple snapshots. For example, if the filer is running two dump
commands simultaneously, you find these snapshots in the volumes from which data
is being backed up: snapshot_for_backup.0 and snapshot_for_backup.1
.
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In addition to backing up data within files, the dump command backs up these types
of metadata:
UNIX group ID, owner ID, and file permissions
UNIX access time and modify time