Sun Microsystems SL500 manual Terminology, Planning Library Capacity

Capacity on Demand Features and Restrictions

■Storage capacity is incremental. Total licensed capacity is equal to the sum of the capacities specified in each license key file installed and activated on the library.

■The order that capacity licenses are installed is not significant (that is, it does not need to match the order of the modules in the SL500 frame).

Terminology

The following terms are used to describe library capacity management:

■Physical or installed capacity—The number of storage cells physically present in the library.

■Licensed capacity—The number of storage cells the library is licensed to use. This cannot exceed the installed capacity.

Planning Library Capacity

The SL500 does not support gaps in licensed capacity; all storage cells must be contiguous. This has the following effects on capacity planning.

You can begin adding licensed capacity to a module only if the module directly above it is licensed at full capacity.

Example: Base Module + DEM

The Base Module must be licensed at full capacity before you can begin adding licensed capacity to the DEM.

Deleting a Capacity license for a module in the middle of a library will cause the modules below it to be unavailable.

Example: Base Module + DEM + CEM + CEM

Removing any portion of the DEM capacity will make both CEMs unavailable.

Note – CEMs must be at the bottom of any SL500 configuration. A CEM cannot be installed between a Base Module and a DEM.

138 SL500 User’s Guide • July 2008 Revision: KA • 96116