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Celerra Network Server Command Reference Manual
The fs Commands
fs_ckpt
Manages checkpoints using the SnapSure™ functionality.
SYNOPSIS
fs_ckpt {<fs_name> | id=<fs_id>}
-list
| [-name <name>] -Create [<volume_name>] [-option <options>]
| [-name <name>] -Create [size=<integer>[T|G|M|%]]
[pool=<pool>][storage=<system_name>][-option <options>]
| -refresh [-option <options>]
| [-name <name>] -Restore [-Force][-option <options>]
DESCRIPTION fs_ckpt creates a checkpoint of a production file system (PFS), lists
the associated checkpoints of the PFS, refreshes a checkpoint to the
current time, and restores a PFS back to a specific point-in-time using
a checkpoint. Checkpoints can be deleted using
nas_fs .
What is a checkpoint?
A PFS is made up of blocks. When a block within the PFS is modified,
a copy containing the original contents of that block is saved to a
separate metavolume called the SavVol. Subsequent changes made to
the same block in the PFS, are not copied into the SavVol. The
original blocks from the PFS (in the SavVol) and the unchanged PFS
blocks (that remain in the PFS) are read according to a bitmap and
blockmap data tracking structure. These blocks combine to provide a
complete point-in-time file system image which is called a
checkpoint.
Using this command, checkpoints can be created by:
• specifying the volume by name, or using the default
• by specifying the size, the storage pool you want to use, or the
storage system on which the storage pool will reside.
OPTIONS
-list
Displays a listing of all associated checkpoints for the specified file
system.
[-name <name>] -Create
Creates, mounts, and optionally assigns a name to the checkpoint of
the PFS as specified by the <name>. The checkpoint must be
unmounted prior to unmounting the PFS. Names assigned to a
checkpoint cannot be all numeric.
If a name is not chosen, one is
assigned by default.