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I'm referencing Redbook - IBM ProtecTIER Implementation and Best Practices Guide

1) Anyone using ProtecTIER deduplication?
I'm curious how much savings I might see, especially large history files that do not change.

As data is written to the ProtecTIER device, it is examined for identical blocks of information
that already were added to the repository. This identical data is not stored again in the
repository; it is referenced as duplicate data and reduces the amount of disk space that is
required. This process is known as deduplication. The engine for ProtecTIER deduplication is
called HyperFactor.


2) Is there anyway of estimating how much storage is needed?
I currently have Perm Retention - 77 full LTO5 - 77 x 3.0 tb (compressed) = 231 tb.

Create only the number of cartridges that your repository can handle, maybe even fewer
to control the repository allocation of different VTLs. You can estimate the size of a
repository by multiplying the real size of the repository by the HyperFactor ratio. Then,
divide it by the tape size and determine the optimized number of tapes.
Important: Be careful not to overestimate the repository size. Wait until the backup
application sends some data to provide a better view of the real deduplication ratio


3) Can existing LTO5 be migrated?

4) Will this change anything within BRMS?

5) Would I need an additional FC adapter on each LPAR to attach to the I, multiple LPARs?

6) Can multiple processes be run simultaneously from multiple LPARs as I do now with 4 LTO5 HH?

7) Would a VTL be faster than LTO5, LTO6, LTO7 (soon to be announced)

18.2.1 Backup considerations with ProtecTIER
Using VTL is not necessarily faster than physical tape backup. IBM tape products have been
tested and work efficiently with IBM i. IBM i is able to achieve 90% - 100% of tape drive speed
in an environment with fewer tape drives. You often require multiple streams in a VTL to
achieve the same performance throughput as physical tapes. In this scenario, Backup,
Recovery, and Media Service (BRMS) is useful in managing the tape media resources for
parallel saves.
In addition to performance throughput, you can use BRMS to share VTL resources across
multiple LPARs.
BRMS tracks what you saved, when you saved it, and where it is saved. When you need to
do a recovery, BRMS ensures that the correct information is restored from the correct tapes
in the correct sequence.

Thank You
_____
Paul Steinmetz
IBM i Systems Administrator

Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071

610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home

psteinmetz@xxxxxxxxxx<mailto:psteinmetz@xxxxxxxxxx>
http://www.pencor.com/


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