Mixing LTO drives and media in a library
When you mix different generations of LTO drives and media, you must consider the read/write capabilities of each generation. The preferred method is to configure a different device class for each generation of media.
About this task
|Drives||Generation 1 media||Generation 2 media||Generation 3 media||Generation 4 media||Generation 5 media||Generation 6 media||Generation 7 media||Generation M8 media||Generation 8 media|
|Generation 1||Read/write access||n/a||n/a||n/a||n/a||n/a||n/a||n/a||n/a|
|Generation 2||Read/write access||Read/write access||n/a||n/a||n/a||n/a||n/a||n/a||n/a|
|Generation 3||Read-only access||Read/write access||Read/write access||n/a||n/a||n/a||n/a||n/a||n/a|
|Generation 4||n/a||Read-only access||Read/write access||Read/write access||n/a||n/a||n/a||n/a||n/a|
|Generation 5||n/a||n/a||Read-only access||Read/write access||Read/write access||n/a||n/a||n/a||n/a|
|Generation 6||n/a||n/a||n/a||Read-only access||Read/write access||Read/write access||n/a||n/a||n/a|
|Generation 7||n/a||n/a||n/a||n/a||Read access||Read/write access||Read/write access||n/a||n/a|
|Generation 8||n/a||n/a||n/a||n/a||n/a||n/a||Read/write access||Read/write access||Read/write access|
If you are mixing different types of drives and media, configure different device classes: one for each type of media. To specify the media type, use the FORMAT parameter in each of the device class definitions. (Do not specify FORMAT=DRIVE.) For example, if you are mixing Ultrium Generation 5 and Ultrium Generation 6 drives, specify FORMAT=ULTRIUM5C (or ULTRIUM5) for the Ultrium Generation 5 device class, and FORMAT=ULTRIUM6C (or ULTRIUM6) for the Ultrium Generation 6 device class.
In this example, both device classes can point to the same library with Ultrium Generation 5 and Ultrium Generation 6 drives. The drives are shared between the two storage pools. One storage pool uses the first device class and Ultrium Generation 5 media exclusively. The other storage pool uses the second device class and Ultrium Generation 6 media exclusively. Because the two storage pools share a single library, Ultrium Generation 5 media can be mounted on Ultrium Generation 6 drives as they become available during mount point processing.
If you mix older read-only media generations with newer read/write media in a single library, you must mark the read-only media as read-only and check out all read-only scratch media. For example, if you are mixing Ultrium Generation 4 with Ultrium Generation 6 drives and media in a single library, you must mark the Generation 4 media as read-only. In addition, you must check out all Generation 4 scratch volumes.