Attention:
The HD slots have a constant force spring for maintaining forward pressure on
the tape cartridges. Use caution when inserting or removing cartridges from HD slots.
HD frame model S24 provides storage for up to 1 000 IBM 3592 tape cartridges, while the
HD frame model S54 provides storage for up to 1 320 LTO Ultrium tape cartridges. The base
capacity of Model S24 is 600 cartridges, which are stored in Tiers 0, 1, and 2. The base
capacity of Model S54 is 660 cartridges, which are stored in Tiers 0, 1, and 2. In order to
increase capacity to the maximum for each frame, it is necessary to purchase the High
Density Capacity on Demand (HD CoD) feature. This feature provides a license key that
enables you to utilize the storage space available in the remaining tiers.
Note:
These numbers represent raw capacity and do not reflect actual recommended
capacity. It is recommended that actual capacity does not exceed 99% of the raw capacity
due to the need to maintain unused slots in order to perform a
shuffle
operation.
In HD frames, the cartridge accessor performs a
shuffle
operation in order to access the
cartridges stored in Tier 2 and beyond. A shuffle is the process of moving cartridges in lower
tiers into the gripper, or other available slots, to access cartridges in higher tiers (Tier 2 or
greater). In order to reduce the occurrence of shuffle operations and to take advantage of
repeated accesses of certain cartridges, the role of
cartridge cache
is assigned to all single-
deep (Tier 0) slots in an HD library. In order to maintain efficient shuffle operations, the
library performs a
load balancing
of the tiers, which stores cartridges across all HD slots in
the library string. In other words, all HD slots are filled to a minimum tier level until that tier
is full across the library.
HD frame models S24 and S54 can be attached to installed Dx2, Dx3, Lx2, and Lx3 frames
and these frames can be intermixed in the same library configuration.
Notes:
•
In order to support mixed media in an HD library with dual accessors, service bay B
must be a model Dxx frame. This configuration requires feature code 1697, which
ensures that the service bays provide both LTO and 3592 HD test slots.
