Diffsnapshot

The diffsnapshot option controls whether the backup-archive client creates the differential snapshot when it runs a snapshot difference incremental backup.

If the differential snapshot is not created by the client, the latest snapshot found on the volume is used as the differential snapshot and as the source for the backup operation.

The default value is to create the differential snapshot. This option is ignored the first time that the snapdiff option is used. The first time the snapdiff option is used on a volume, a snapshot must be created and used as the source for a full incremental backup. Snapshots that are created by the backup-archive client are deleted by the client after the next snapshot difference incremental backup is complete.

AIX operating systems Linux operating systems Snapshots can be created with the Network Appliance FilerView tool. Use the latest parameter if you want the client to use the most recent snapshot that was created with this or any other method. Snapshots that are created by methods outside of Tivoli® Storage Manager are never deleted by the client.

Windows operating systems Snapshots can be created with the Network Appliance FilerView tool. Use the latest parameter if you want the client to use the most recent snapshot that was created. Whatever method is used to create named snapshots, snapshot names that differ only by case will not work properly with the snapdiff option. Snapshots that are created by the client will not have the casing problem. Snapshots that are created by methods outside of Tivoli Storage Manager are never deleted by the client.

Supported Clients

Windows operating systems This option is valid for all Windows clients except IA® 64 bit.

This option is valid for the following clients:

AIX® 64-bit clients
Linux x86_64 clients

Syntax


                 .-create-.   
>>-DIFFSNAPSHOT--+--------+------------------------------------><
                 '-latest-'

Parameters

create: Specifies that you want to create a new, persistent, snapshot to use as the source snapshot. This value is the default.
latest: Specifies that you want to use the latest snapshot that is found on the file server as the source snapshot.

Examples

Command line:: Perform a snapshot difference incremental backup of an NFS mounted file system /vol/vol1 hosted on the file server homestore.example.com, where /net/home1 is the mount point of /vol/vol1.; incremental -snapdiff -diffsnapshot=latest /net/home1
The -diffsnapshot option value of latest means that the operation uses the latest snapshot (the active snapshot).
Command line:: Perform a snapdiff incremental backup from a snapshot that was taken of a network share //homestore.example.com/vol/vol1 mounted on drive H:, where homestore.example.com is a file server.; incremental -snapdiff H:; Perform a snapdiff incremental backup from a snapshot that was taken of a network share //homestore.example.com/vol/vol1 mounted on drive H:, where homestore.example.com is a file server. The -diffsnapshot option value of LATEST means the operation uses the latest snapshot (the active snapshot) for volume H:.; incremental -snapdiff H: -diffsnapshot=latest