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

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Library Partitioning and Element Addressing

operation on the alternate control path without interrupting the application. AIX,
HP-UX, Solaris, Linux, and Windows 2003 hosts are currently supported for this
feature.
For library firmware of 8.xx or lower the 2U library does not support Control Path
Failover and Data Path Failover. As a result, there should be no license key entry
for "Path Failover" on the 2U library.Library firmware levels higher than 8.xx
support Path Failover on both the 2U library and the 4U library. Path Failover is a
combination of two previous features: Control Path Failover (key entered at the
library user interface) and Data Path Failover (key entered at the device driver
interface). A single activation key entered at the library user interface now activates
both features unless the LTO-3 drive firmware level is equal to or lower than 73P5
and/or the library firmware is equal to or lower than 1.95. For either or both of
these two cases, the device driver interface Data Path Failover key activation will
still be required. For library firmware of 8.xx or lower the Path Failover feature is
available for select LTO 4 tape drives, and is not supported for Half High
drives.Library firmware levels higher than 8.xx support Path Failover on LTO 5
Full High and Half High drives, as well as LTO 4 Full Highand Half High drives.
Library firmware levels higher than B.50 support Path Failover on LTO 6 Tape
Drives, and also LTO 5 and LTO 4 Full High Drives.
The Path Failover feature can be installed by the customer. For ordering
information, see Chapter 11, "Optional Features, Replacement Parts and Power
Cords," on page 11-1.
For more information about using the path failover feature, see the IBM Ultrium
Device Drivers Installation and User's Guide.
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 has been expanded with the new library firmware and
half-high drive integration. Now it is possible to configure 1, 2, 3 or 4 partitions in
the 4U library. Additionally the 2U library can now be 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 high drives are installed in a 2U library, the library firmware will
support partitioning in the same way that the 4U supports partitioning with two
full high drives today. The first partition will contain the first magazine and the
first drive. The second partition will contain the second magazine and the second
drive. The I/O station (if configured as I/O) will be shared, as is done with the
partitioned 4U library.
One full high drive is "Drive 1". When using half high drives, the first half high
drive position will be called "Drive 1", The second half high drive position will be
called "Drive 2."
Partitioning of 4U Libraries
When one or more half high drives are added to a 4U library, the drive naming
will change. Currently, the first full high drive is "Drive 1" and the second full high
drive is "Drive 2". When you consider that each full high drive slot may contain
Chapter 3. Installation Planning
3-3