Dell 740N Laptop User Manual


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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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dump
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dump
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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
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