To update a device class, first complete the following fields and then click Finish, or click Cancel to end this task.
Select an option. This parameter is optional. 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 | Description |
3592C | Compressed format |
3592 | Uncompressed (basic) format |
Drive | 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. |
Select the name of the defined library object that contains the drives used by this device class.
Enter the maximum number of volumes that can be simultaneously mounted for the device class.
The following are possible values:
number | Specify the maximum number
of drives used concurrently. This value can be any number from 0 to 256.
This value must never be allowed to exceed the number of drives that are defined and online in the library that services this device class. |
0 | The value of zero prevents new transactions from gaining access to the storage pool. |
Enter the maximum length of time, in minutes, to wait for a volume to be mounted.
Enter the amount of time, in minutes, to retain an idle volume before dismounting it.
Enter the maximum amount of data the server can store in the volumes categorized by this device class. This parameter is optional.
The value must be an integer followed by one of these units:
K | Kilobyte. |
M | Megabyte |
G | Gigabyte |
Enter the estimated capacity for the volumes categorized by this device class. This parameter is optional.
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.
Enter the expiration date that is placed on the tape labels for this device class, which are used for allocation. This parameter is optional. Enter the value as shown:
yyyyddd | Specifies the expiration date for this device class in YYYYDDD format. For example, 2004007 signifies that expiration occurs on the seventh day of year 2004, or January 7, 2004. |
Enter an integer between 1-9999 that defines the length of time, in days, to retain the tape. This parameter is optional.
Specify whether RACF, if installed, protects volumes assigned to this device class. If protection is provided, RACF profiles are created for the volumes. This parameter is optional.
Possible values for Protection:
No | Specifies that RACF does not protect cartridge volumes assigned to this device class. |
Yes | Specifies that RACF protects cartridge volumes assigned to this device class. RACF profiles are created for volumes when the server first uses the volumes, but profiles are not deleted when volumes are deleted from the server. Profiles will have to be manually deleted. |
Automatic | Specifies that RACF protects cartridge
volumes assigned to this device class. RACF profiles are
deleted when volumes are deleted from the server. If you specify automatic, volumes deleted from the server will no longer be RACF-protected and the data on these volumes will be accessible by other users. |
Enter an esoteric unit name, up to 8 characters, to specify a group of tape devices that support 3592 System tape. This parameter is optional.
For LAN-free configuration, use the unit name that represents the subset of drives that are attached to z/OS in the library.