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. |
DLT10 | Specifies that ADSM writes data using the DLT10 recording format. This results in a tape capacity of approximately 10.0GB when using CompacTape III or CompacTape IV cartridges. |
DLT10C | Specifies that ADSM writes data using the DLT10C recording format. This results in a tape capacity of approximately 20.0GB when using CompacTape III and CompacTape IV cartridges. This format, however, uses the tape drive's hardware compression feature, so the actual capacity may be greater than 20.0GB, depending on the effectiveness of the compression feature. |
DLT15 | Specifies that ADSM writes data using the DLT15 recording format. This results in a tape capacity of approximately 15.0GB when using CompacTape III or CompacTape IV cartridges |
DLT15C | Specifies that ADSM writes data using the DLT15C recording format. This results in a tape capacity of approximately 30.0GB when using CompacTape III or CompacTape IV cartridges. This format, however, uses the tape drive's hardware compression feature, so the actual capacity may be greater than 30.0GB, depending on the effectiveness of the compression feature. |
DLT20 | Specifies that ADSM writes data using the DLT20 recording format. This results in a tape capacity of approximately 20.0GB when using CompacTape IV cartridges. |
DLT20C | Specifies that ADSM writes data using the DLT20C recording format. This results in a tape capacity of approximately 40.0GB when using CompacTape IV cartridges. This format, however, uses the tape drive's hardware compression feature, so the actual capacity of the cartridge may be greater than 40.0GB, depending on the effectiveness of the compression feature. |
DLT35 |
Specifies that ADSM writes data using the DLT35 recording format. This results in a tape capacity of approximately 35.0GB when using CompacTape IV cartridges. |
DLT35C | Specifies that ADSM writes data using the DLT35C recording format. This results in a tape capacity of approximately 70.0GB when using CompacTape IV cartridges. This format, however, uses the tape drive's hardware compression feature, so the actual capacity of the cartridge may be greater than 70.0GB, depending on the effectiveness of the compression feature. |
Library
Type the name of the defined library object that contains the DLT 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: