Defining a 3570 Device Class

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

Device Class Name

Enter the name of the device class to be defined. The maximum length of the device class name is 30 characters.

Recording Format

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

Drive Specifies that Tivoli Storage Manager selects the highest format that can be supported by the drive on which a volume is mounted. The default is Drive.
3570B Specifies that Tivoli Storage Manager writes data using the basic (uncompressed) format. This results in a tape capacity of approximately 5GB.
3570C Specifies that Tivoli Storage Manager writes data using the compressed format. This results in a tape capacity of approximately 5GB. This format, however, uses the tape drive's hardware compression feature, so the actual capacity may be greater, depending on the effectiveness of compression.

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 Specify the number of drives defined and online in the library. The default is Drives.
value 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

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, Tivoli Storage Manager 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 a scale factor.

Scale factors and their meanings are:

K Kilobyte
M Megabyte
G Gigabyte

Mount Wait

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