To define a device class, first complete the following fields and then click Finish, or click Cancel to end the task.
Enter the name of the device class to be defined.
Select the recording format to be used when writing data to volumes in this device class. The default is Drive.
Note: This format uses the tape drive hardware compression feature. Depending on
the effectiveness of compression, the actual capacity may be greater than
the listed value.
Format | Estimated Capacity | Description |
Drive |
Determined by drive capacity. |
The server selects the highest format that is 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. |
DDS1 | 1.3GB (60-meter)
2.0GB (90-meter) |
Uncompressed format, only applies to 60-meter and 90-meter tapes. |
DDS1C | See note above.
1.3GB (60-meter) 2.0GB (90-meter) |
Compressed format, only applies to 60-meter and 90-meter tapes. |
DDS2 | 4.0GB | Uncompressed format, only applies to 120-meter tapes. |
DDS2C | See note above.
8.0GB |
Compressed format, only applies to 120-meter tapes. |
DDS3 | 12.0GB | Uncompressed format, only applies to 125-meter tapes. |
DDS3C | See note above.
24.0GB |
Compressed format, only applies to 125-meter tapes. |
DDS4 | 20.0GB | Uncompressed format, only applies to 150-meter tapes. |
DDS4C | See note above.
40.0GB |
Compressed format, only applies to 150-meter tapes. |
DDS5 | 36GB when using DAT 72 media. | Uncompressed format, using DAT 72 media.. |
DDS5C | See note above.
72GB when using DAT 72 media. |
Compressed format, using DAT 72 media.. |
Select the name of the library that contains the 4mm tape drives used by this device class.
Enter the maximum number of volumes that can be simultaneously mounted for the device class. The default is Drives.
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 | Specifies 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. |
Enter the amount of time, in minutes, to retain an idle volume before dismounting it.
Enter the prefix 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.
Enter the estimated capacity for the volumes assigned to this device class. This parameter is optional.
You can specify this parameter if the default estimated capacity for the device class is inaccurate due to compression of data.
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.
Enter the maximum length of time, in minutes, to wait for a volume to be mounted.