IBM Tivoli Storage Manager, Version 7.1

Access modes for storage pool volumes

Access to a volume in a storage pool is determined by the access mode assigned to that volume. You can manually change the access mode of a volume, or the server can change the access mode based on what happens when it tries to access a volume.

For example, if the server cannot write to a volume having read/write access mode, the server automatically changes the access mode to read-only.

The following access modes apply to storage pool volumes:

Read/write

Allows files to be read from or written to a volume in the storage pool.

If the server cannot write to a read/write access volume, the server automatically changes the access mode to read-only.

If a scratch volume that is empty and has an access mode of off-site is updated so that the access mode is read/write, the volume is deleted from the database.

Read-only

Allows files to be read from but not written to a disk or tape volume.

If a scratch volume that is empty and has an access mode of off-site is updated so that the access mode is read-only, the volume is deleted from the database.

Unavailable

Specifies that the volume is not available for any type of access by the server.

You must vary offline a random-access volume before you can change its access mode to unavailable. To vary a volume offline, use the VARY command. See Varying disk volumes online or offline.

If a scratch volume that is empty and has an access mode of off-site is updated so that the access mode is unavailable, the volume is deleted from the database.

Destroyed

Specifies that a primary storage pool volume has been permanently damaged. Neither users nor system processes (like migration) can access files stored on the volume.

This access mode is used to indicate an entire volume that should be restored using the RESTORE STGPOOL or RESTORE VOLUME command. After all files on a destroyed volume are restored to other volumes, the destroyed volume is automatically deleted from the database. See

Only volumes in primary storage pools can be updated to an access mode of destroyed.

You must vary offline a random-access volume before you can change its access mode to destroyed. To vary a volume offline, use the VARY command. See Varying disk volumes online or offline. Once you update a random-access storage pool volume to destroyed, you cannot vary the volume online without first changing the access mode.

If you update a sequential-access storage pool volume to destroyed, the server does not attempt to mount the volume.

If a volume contains no files and the UPDATE VOLUME command is used to change the access mode to destroyed, the volume is deleted from the database.

Offsite

Specifies that a copy storage pool volume or active-data pool volume is at an off-site location and therefore cannot be mounted. Use this mode to help you track volumes that are off-site. The server treats off-site volumes differently, as follows:

Mount requests are not generated for off-site volumes.
Data can be reclaimed or moved from off-site volumes by retrieving files from other storage pools.
Empty, off-site scratch volumes are not deleted from the copy storage pool or from the active-data pool.

You can only update volumes in a copy storage pool or an active-data pool to off-site access mode. Volumes that have the device type of SERVER (volumes that are actually archived objects stored on another Tivoli Storage Manager server) cannot have an access mode of off-site.

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