Manage snapshots using the CLI
This page describes how to manage snapshots using the CLI.
Using the CLI, you can:
Add a snapshot
Command: weka fs snapshot add
Use the following command line to create a snapshot:
weka fs snapshot add <file-system> <name> [--access-point access-point] [--source-snap=<source-snap>] [--is-writable]
Parameters
Name
Type
Value
Limitations
Mandatory
Default
file-system
String
A valid filesystem identifier
Must be a valid name
Yes
name
String
Unique name for filesystem snapshot
Must be a valid name
Yes
access-point
String
Name of the newly-created directory for filesystem-level snapshots, which serves as the access point for the snapshots
Must be a valid name
No
source-snap
String
Must be an existing snapshot
Must be a valid name
No
The snapshot name of the specified filesystem.
is-writable
Boolean
Sets the created snapshot to be writable
No
False
Remove a snapshot
Command: weka fs snapshot remove
Use the following command line to remove a snapshot:
weka fs snapshot remove <file-system> <name>
Parameters
Name
Type
Value
Limitations
Mandatory
Default
file-system
String
A valid filesystem identifier
Must be a valid name
Yes
name
String
Unique name for filesystem snapshot
Must be a valid name
Yes
A snapshot deletion cannot happen parallel to a snapshot upload to the same filesystem. Since uploading a snapshot to a remote object store might take a while, it is advisable to delete the desired snapshots before uploading to the remote object store.
This becomes more important when uploading snapshots to local and remote object stores. While local and remote uploads can progress in parallel, consider the case of a remote upload in progress, then a snapshot is deleted, and later a snapshot is uploaded to the local object store. In this scenario, the local snapshot upload waits for the pending deletion of the snapshot (which happens only once the remote snapshot upload is done).
Restore a snapshot to a filesystem or another snapshot
Commands: weka fs restore or weka fs snapshot copy
Use the following command line to restore a filesystem from a snapshot:
weka fs restore <file-system> <source-name> [--preserved-overwritten-snapshot-name=preserved-overwritten-snapshot-name] [--preserved-overwritten-snapshot-access-point=preserved-overwritten-snapshot-access-point]
Use the following command line to restore a snapshot to another snapshot:
weka fs snapshot copy <file-system> <source-name> <destination-name> [--preserved-overwritten-snapshot-name=preserved-overwritten-snapshot-name] [--preserved-overwritten-snapshot-access-point=preserved-overwritten-snapshot-access-point]
Parameters
file-system*
A valid filesystem identifier
source-name*
Unique name for the source of the snapshot
destination-*name
Destination name to which the existing snapshot should be copied to.
preserved-overwritten-snapshot-name
A new name for the overwritten snapshot to preserve, thus allowing the IO operations continuity to the filesystem. If not specified, the original snapshot or active filesystem is overwritten, and IO operations to an existing filesystem might fail.
preserved-overwritten-snapshot-access-point
A directory that serves as the access point for the preserved overwritten snapshot.
If the preserved-overwritten-snapshot-name parameter is specified, but the preserved-overwritten-snapshot-access-pointparameter is not, it is created automatically based on the snapshot name.
When restoring a filesystem from a snapshot (or copying over an existing snapshot), the filesystem data and metadata are changed. If you do not specify the preserved-overwritten-snapshot-name parameter, ensure IOs to the filesystem are stopped during this time.
Update a snapshot
Command: weka fs snapshot update
This command changes the snapshot attributes. Use the following command line to update an existing snapshot:
weka fs snapshot update <file-system> <name> [--new-name=<new-name>] [--access-point=<access-point>]
Parameters
file-system*
A valid filesystem identifier
name*
Unique name for the updated snapshot
new-name
New name for the updated snapshot
access-point
Name of a directory for the snapshot that serves as the access point for the snapshot
Access the .snapshots directory
.snapshots directoryThe .snapshots directory is located in the root directory of each mounted filesystem. It is not displayed with the ls -la command. You can access this directory using the cd .snapshots command from the root directory.
Example
The following example shows a filesystem named default mounted to /mnt/weka.
To confirm you are in the root directory of the mounted filesystem, change into the .snapshots directory, and then display any snapshots in that directory:
Retrieve snapshot details
Command: weka fs snapshot
Use the following command to retrieve snapshot details, such as its UID, local object locator, estimated reclaimable space, and metadata size:
--file-system
Filesystem name
--name
Snapshot name
-o, --output...
Specify which columns to output. May include any of the following: uid, id, filesystem, name, access, writeable, created, local_upload_size, remote_upload_size, local_object_status, local_object_progress, local_object_locator, remote_object_status, remote_object_progress, remote_object_locator, removing, prefetched, est_reclaimable_size, metadata_size (may be repeated or comma-separated)
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