Library Partitioning And Element Addressing - IBM TS3100 Setup, Operator, And Service Manual

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. 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 never 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.
Important: Drives that do not share a common media type cannot be mixed in the same logical library.
For instance, Gen 3 and Gen 6 drives cannot use the same media and so they cannot be mixed. LTO 3
media cannot be read on LTO 6 drives. LTO 4 media cannot be read on LTO 7 drives.
Configuration of a 1 - partition system
A one partition system configured for a 4U library contains any and all drives present in any drive
positions, and it contains all four magazines.
When configured with one logical partition, the Element Address assignments is as follows: DTE
assignments are shown in Figure 14 on page 30.
STE assignments:
v Logical Library 1: Slot1 through 23 4096 (0x1000) through 4118 (0x1016) as shown in Figure 17 on page
31
29
Installation planning