Table 63. 4U library SCSI element addresses for storage slots and drive slot (one logical partition with drives in slot 1
and slot 2) (continued)
Upper Left Magazine
⇐Front of 4U library
Library
Rear Panel
Upper Right Magazine
Front of 4U library⇒
Lower Left Magazine
Drive 1
256
(0x100)
Lower Right Magazine
I/O Slot 3
18
(0x12)
Slot 7
4102
(0x1006)
Slot 8
4103
(0x1007)
Slot 9
4104
(0x1008)
Slot 33
4128
(0x1020)
Slot 32
4127
(0x101F)
Slot 31
4126
(0x101E)
Slot 30
4125
(0x101D)
I/O Slot 2
17
(0x11)
Slot 4
4099
(0x1003)
Slot 5
4100
(0x1004)
Slot 6
4101
(0x1005)
Slot 29
4124
(0x101C
Slot 28
4123
(0x101B)
Slot 27
4122
(0x101A)
Slot 26
4121
(0x1019)
I/O Slot 1
16
(0x10)
Slot 1
4096
(0x1000)
Slot 2
4097
(0x1001)
Slot 3
4098
(0x1002)
Slot 25
4120
(0x1018)
Slot 24
4119
(0x1017)
Slot 23
4118
(0x1016)
Slot 22
4117
(0x1015)
Library partitioning and element addressing
Library 4U systems with firmware versions of 1.70 and higher, and containing at least 2 drives, have the
ability to configure two logical libraries (create two partitions). This partitioning is expanded with the
new library firmware and half height drive integration. Now it is possible to configure 1, 2, 3 or 4
partitions in the 4U library. Additionally the 2U library is configured into one or two partitions. Each
library must contain at least one drive per logical library (partition).
Partitioning of 2U libraries
When two half height drives are installed in a 2U library, the library firmware supports partitioning in
the same way that the 4U supports partitioning with two full height drives today. The first partition
contains the first magazine and the first drive. The second partition contains the second magazine and
the second drive. The I/O station (if configured as I/O) is shared, as is done with the partitioned 4U
library.
One full height drive is "Drive 1". With half height drives, the first half height drive position is called
"Drive 1", The second half height drive position is called "Drive 2."
Partitioning of 4U libraries
When one or more half height drives are added to a 4U library, the drive naming changes. Currently, the
first full height drive is "Drive 1" and the second full height drive is "Drive 2". When you consider that
each full height drive slot might contain one or two half height drives, there are four potential drives in
the space that used to occupy two. As a result, the first half height drive position, or the first full height
drive position, is called "Drive 1". The second half height drive position is called "Drive 2". The third half
height drive position, or the second full height drive position, is called "Drive 3". The fourth half height
drive position is called "Drive 4".
Important: In a 4U library a full height drive sled might be installed in drive slot 1 (drive occupies slot 1
and slot 2) or drive slot 3 (drive occupies slot 3 and slot 4). A full height drive sled must not be installed
in drive slot 2 (drive occupies slot 2 and slot 3).
Mixing of drives
The library supports a mix of full height and half height drives in the same physical library and the same
logical library. They support a mix of drives in the same physical library and the same logical library.
They also support a mix of SCSI, SAS, and Fibre Channel in the same physical library and the same
logical library; however, mixing drive interface types in the same logical library is not recommended.
Appendix B. SCSI element types, SCSI addresses, and physical configurations 287
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