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System Management Guide: Operating System and Devices

Making an Online Backup of a Mounted File System

Making an online backup of a mounted JFS file system creates a snapshot of the logical volume that contains the file system. This procedure describes how to split off a mirrored copy to be used to make a backup.

Prerequisites

In order to make an online backup of a mounted file system, the logical volume that the file system resides on must be mirrored. The JFS log logical volume for the file system must also be mirrored.

NOTE: Because the file writes are asynchronous, the snapshot may not contain all data that was written immediately before the snapshot is taken. Modifications that start after the snapshot begins may not be present in the backup copy. Therefore, it is recommended that file system activity be minimal while the split is taking place.

Split Off a Mirrored Copy of the File System

Reintegrate a Mirrored Copy of the File System

For additional information about mirrored logical volumes, see the Logical Volume Storage Overview, or the mklv and mklvcopy commands.


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