Updating a DTF Device Class

To update a device class, first complete the following fields and then click Finish, or click Cancel to end the task.

Recording Format

Select the recording format to be used when writing data to media.

Format Estimated Capacity Description
Drive Determined by drive capacity. The server selects the highest format that can be supported by the drive on which a volume is mounted.

Avoid specifying DRIVE when a mixture of drives is used within the same library.

For example, do not use this option for a library containing some drives that support recording formats superior to other drives.

DTF 12.0GB

42.0GB

Using GW-240 tape cassettes

Using GW-730L tape cassettes

DTFC 24.0GB

84.0GB

Using GW-240 tape cassettes

Using GW-730L tape cassettes

DTF2 60.0GB

200.0GB

Using GW2-60GS tape cassettes

Using GW2-200GL tape cassettes

DTF2C 120.0GB

400.0GB

Using GW2-60GS tape cassettes

Using GW2-200GL tape cassettes

Library Name

Select the name of the library that contains the tape drives used by this device class.

Mount Limit

Enter the maximum number of volumes that can be simultaneously mounted for the device class.

The following are possible values:

Drives Specifies that the server determines the mount limit based on the number of drives defined and online in the library.
number Specify the maximum number of drives used concurrently. This value can be any number from 0 to 256.

This value must not be allowed to exceed the number of drives defined and online in the library.

For external libraries, specify the number of drives for the library.

0 The value of zero prevents new transactions from gaining access to the storage pool.

Mount Retention Period

Enter the amount of time, in minutes, to retain an idle volume before dismounting it.

Tape Volume Prefix

Enter the high level qualifier of the file name that the server writes into the media labels. For each volume assigned to this device class, the server uses this prefix to create the data set name.

Example: AB.CD2.E

Estimated Capacity

Enter the estimated capacity for the volumes assigned to this device class.

You do not need to specify an estimated capacity unless the drives perform data compression, or you have volumes of nonstandard size.

The value must be an integer followed by one of these units:

K Kilobyte
M Megabyte
G Gigabyte

For more information on the default estimated capacity, see the Recording Format heading.

Mount Wait Period

Enter the maximum length of time, in minutes, to wait for a volume to be mounted.