Capacity of L55, D55, and S55 frames
The position and configuration of the frame, and the installation of capacity on
demand (CoD) features, affect the total available capacity of the L55, D55, and S55
frames.
Table 43 shows available storage capacity based on possible frame positions and
configurations.
Table 43. Quantity of storage slots in L55, D55, and S55 frames
Frame model
Licensed
feature(s)
Frame
position
Quantity of
drives
Quantity of
I/O slots
Quantity of
storage slots
L55 Entry 1 1 to 12 36 100
Intermediate 1 1 to 12 36 200
Base 1 0 to 12 36 400
Base 2+ 0 to 16 36 400
HD CoD 1 0 to 12 36 730
HD CoD 2+ 0 to 16 36 882
D55 Base 1 0 to 12 0 or 36 500
Base 2+ 0 to 16 0 or 36 500
HD CoD 1 0 to 12 36 730
HD CoD 1 0 to 12 0 774
HD CoD 2+ 0 to 16 36 882
HD CoD 2+ 0 to 16 0 970
S55 Base Any 0 0 660
HD CoD 1 0 0 1054
HD CoD 2+ 0 0 1320
Tape encryption overview
The tape drives that are supported by the TS4500 tape library can encrypt data as
it is written to a tape cartridge.
Encryption is performed at full line speed in the tape drive after compression.
(Data is compressed more efficiently before it is encrypted.) This capability adds a
strong measure of security to stored data without any processing usage and
performance degradation.
The following three major elements comprise the tape drive encryption solution:
The encryption-enabled tape drive
All of the tape drives that are supported by the TS4500 tape library are
encryption capable. Encryption capability means that they are functionally
capable of performing hardware encryption, but this capability is not yet
activated. To perform hardware encryption, the tape drives must be
encryption-enabled. Encryption can be enabled on the tape drives through
the TS4500 management GUI.
Note: FC 1604, Transparent LTO Encryption, is required for
library-managed encryption on LTO tape drives. It is not required for
application-managed encryption.
110 IBM TS4500: Introduction and Planning Guide
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