Dealing with change
The previous scenario may continue to meet customer At the end of this procedure, Partition 1 offers 48
needs for a number of months. However, with IDC
slots for Customer A’s backup, while the total amount
predicting annual data growth by a factor of x45, it
of available slots remaining in the AMP drops to 72
is just a matter of time before the customer’s storage
slots. This is il ustrated in figure 3.
requirements increase to keep pace with their data.
With fixed partitions, the addition and subtraction of
When more storage is required, the slots in the AMP slots would result in a change in the library size, and
can be made available to the customer’s partition,
ISV applications would need reconfiguration. Often,
and subsequently appear as ‘accessible’ to the ISV
the addition of slots in one fixed partition will require
application. Unlike traditional partitioning, with the
taking slots from another fixed partition. This would
HP ESL G3 Tape Library this is a simple task that can require ISV reconfiguration for both virtual libraries.
be done by assigning magazines of media from the
With AMP, the additions and subtractions don’t affect
AMP to a partition using the Library Management
other partitions. This entire procedure is completed
Console (LMC) of the Tape library.
without any physical change to the tape library, or
To demonstrate: we might assume that to satisfy
any reconfiguration of the ISV software. As far as the
increased backup capacity requirements, Customer A software is concerned, the size of Partition 1 hasn’t
now requires 48 slots, an increase of 24 tape slots.
changed – it simply has more ‘accessible’ media with
A simple slot assignment using the Tape Library LMC the current configuration.
assigns 6 magazines (24 pieces of media) from the
Note that media slots can also be assigned from
AMP to Partition 1. As a result of the management
a Partition back to the AMP should customer
command, the tape library software updates its
requirements ever shrink.
internal database, al ocating 24 more slots of media
from the AMP to Partition 1.
ISV View
Figure 3: Logical al ocation
after media assignment – as
Partition 1 (120 slots) 48 accessible
Partition 2 (120 slots) 24 accessible
seen by the ISV application
AMP = 96 slots
In Summary
The use of an Automated Media Pool (AMP) within a tape library provides a flexible way to grow and
shrink virtual libraries based upon changes in customer storage demands. It removes the need for
investment and management of dedicated sharing software, while overcoming the inflexibility of
fixed-partition approaches. The AMP feature is available in the HP ESL G3 Tape Library from June 2011.
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