Defining a 3592 Device Class

To define a 3592 device class, first complete the following fields and then click Finish, or click Cancel to end this task.

Device Class Name

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

WORM

Specify whether the drive is a WORM (write once, read many) device. This parameter is optional. The default is No.

Note: The Tivoli Storage Manager server does not automatically delete scratch volumes used in WORM storage pools after the volumes are emptied by expiration or other processes. To delete these volumes and remove them from WORM storage pools, you must use the DELETE VOLUME command. Tivoli Storage Manager cannot reuse WORM volumes that were written to by the server and then deleted from a storage pool.

Recording Format

Select an option. This parameter is optional. The default is 3592C.

Notes:

  1. 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.
  2. For LAN-free configurations, you must specify the exact drive type in the Format parameter. This drive type corresponds to the drives used by the storage agent in an external library configuration.
Format Description
3592C Compressed format
3592 Uncompressed (basic) format 
Drive 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.

Library Name

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

Mount Limit

Enter the maximum number of sequential access volumes that can be simultaneously mounted for the device class. Drives cannot be shared between device classes.

The following are possible values:

number Specify the maximum number of drives used concurrently. This value can be any number from 0 to 256. The default is 2.

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.

Mount Wait Period

Enter a number for the maximum length of time, in minutes, to wait for a volume to be mounted. This parameter is optional.

Mount Retention Period

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

Tape Volume Prefix

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

Maximum Capacity

Enter the maximum amount of data the server can store in the volumes categorized by this device class. This parameter is optional. The default is 0.

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

K Kilobyte.
M Megabyte
G Gigabyte

Estimated Capacity

Enter the estimated capacity for the volumes assigned to this device class. This parameter is optional. The default estimated capacity is 300GB.

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.

Expiration

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. 

Retention

Enter an integer between 1-9999 that defines the length of time, in days, to retain the tape. This parameter is optional.

Protection

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. The default is No.
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.

Unit

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. The default is 3592.

For LAN-free configuration, use the unit name that represents the subset of drives that are attached to z/OS in the library.