Define Device Class

Use this window to define a device class for storage pools.


Devclassname

Type the name of the device class to be defined in the Device class name field. The maximum length of the device class name is 30 characters.


Format

Use the Format select box to specify the recording format to be used when writing data to sequential access media.

You can choose only one selection from the list.

Default: Drive

The settings for Format are:

Drive Specifies that ADSM selects the highest format that can be supported by the sequential access drive on which a volume is mounted.
8200 Specifies that ADSM writes data using the 8200 recording format. This results in a tape capacity of 2.3GB when using standard 112M tape cartridges.
8200C Specifies that ADSM writes data using the 8200C recording format. This results in a tape capacity of approximately 2.3GB when using standard 112 meter tape cartridges. This format, however, uses the tape drive's hardware compression feature, so the actual capacity may be greater than 2.3GB, depending on the effectiveness of the compression feature.
8500 Specifies that ADSM writes data using the 8500 recording format. This results in a tape capacity of 5.0GB when using standard 112M tape cartridges.
8500C Specifies that ADSM writes data using the 8500C recording format. This results in a tape capacity of at least 5.0GB when using standard 112M tape cartridges. However, this format uses the tape drive's hardware compression feature, so the actual capacity of the cartridge may be greater than 5.0GB, depending on the effectiveness of the compression feature.
8900 Specifies that ADSM writes data using the 8900 recording format. This results in a tape capacity of 5.0GB when using standard 112M tape cartridges.
AIT Specifies that ADSM writes data using the AIT recording format. This results in a tape capacity of at least 25.0GB when using Sony's T3N cartridges.

AITC

Specifies that ADSM writes data using the AITC recording format. This results in a tape capacity of at least 60.0GB when using Sony's T3N cartridges. This format uses the tape drive's hardware compression feature, so the actual capacity of the cartridge may be greater than 60.0GB, depending on the effectiveness of the compression.

Library

Type the name of the defined library object that contains the 8mm tape drives used by this device class in the Library field.


Mountlimit

Type the maximum number of sequential access volumes that can be simultaneously mounted for the device class in the Mountlimit field.

Default: Drives

Considerations:

The following are possible values:

Drives Specifies that every time a mount point is allocated, the number of drives defined to the library is used to calculate the true mountlimit value, (including taking into account whether each is online).
Mountlimitvalue Specifies the maximum number of drives used concurrently in this device class by ADSM. 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.

Mountretention

Type the amount of time, in minutes, to retain an idle sequential access volume before dismounting it in the Mount Retention field.

Default: 60

Considerations:


Prefix

Type the high level qualifier of the file name that the server writes into the sequential access media labels in the Prefix field. For each sequential access volume assigned to this device class, ADSM uses this prefix to create the data set name.

Default: ADSM

Considerations:


Estcapacity

Type the estimated capacity for the sequential access volumes categorized by this device class in the Estimate Capacity field. Specify an integer followed by a scale factor.

Scale factors and their meanings are:

K Kilobyte
M Megabyte
G Gigabyte

Mountwait

Type the maximum length of time, in minutes, to wait for a sequential access volume to be mounted in the Mount Wait field.

Default: 60

Considerations: