IBM ProtecTier Implementation and Best Practices Guide

© Copyright IBM Corp. 2012. All rights reserved. 439

Glossary

3958 DD1 This is the original server available since

August 2008. This server is based on the IBM System

x3850 M2 Type 7141. When used as a server in the

TS7650G, its machine type and model are 3958 DD1. Use

this machine type and model for service purposes.

3958 DD3 This is a higher performance server available

since March 2009. This server is based on the IBM

System x3850 M2 Type 7233. When used as a server in

the TS7650G, its machine type and model are 3958 DD3.

Use this machine type and model for service purposes.

3958 DD4 This is a newer, higher performance server

available since December 2010. This server is based on

the IBM System x3850 X5 Type 7145-AC1. When used as

a server in the TS7650G, its machine type and model are

3958 DD4. Use this machine type and model for service

purposes.

3958 DD5 This is a newer, higher performance server

available since May 2012. This server is based on the IBM

System x® 7145 model. When used as a server in the

TS7650G, its machine type and model are 3958 DD5. Use

this machine type and model for service purposes.

asynchronously parallel system A system in which the

backed up data does not return to the host (and out to file)

in the same order each time.

Backup, Recovery and Media Services for IBM i

(BRMS) Helps you implement a disciplined approach to

managing your backups, and provides you with an orderly

way to retrieve lost or damaged data. BRMS also enables

you to track all of your backup media from creation to

expiration

BRMS policies A set of defaults that is commonly used

(for example, device or media class). Generally used

defaults are in the BRMS system policy. Backup-related

defaults are in the BRMS backup policy.

chown The chown command (abbreviation for change

owner) is used on UNIX based systems to change the

owner of a file. In most implementations, it can be run by

only the superuser to prevent users simply changing

ownership of files randomly.

compaction (data compaction) The reduction of the

number of data elements, bandwidth, cost, and time for

the generation, transmission, and storage of data without

loss of information by eliminating unnecessary

redundancy.

concurrent saves and restores The ability to save or

restore different objects from a single library or directory

to multiple backup devices or different libraries or

directories to multiple backup devices at the same time

from different jobs.

control group A group of items (for example, libraries or

stream files) to back up, and the attributes associated with

how to back them up.

CSV file (.csv) Comma-separated value file,

sometimes called comma-delimited. This type of file is a

specially formatted plain text file that stores spreadsheet

or basic database-style information in a simple format,

with one record on each line, and each field within that

record separated by a comma. CSV files are used by

ProtecTIER Manager as a simple way to transfer a large

volume of database information between programs. This

type of file can be imported into most spreadsheet

programs

.

deduplication A data compression technique in which

redundant data is eliminated. The technique improves

storage utilization and can also be applied to network data

transferals to reduce the number of bytes that must be

sent across a link

.

direct attachment Refers to a digital storage system

directly attached to a server or workstation, without a

storage network in between.

dirty bit A dirty bit is a flag that indicates whether an

attribute must be updated. This situation usually occurs

when a bit in a memory cache or virtual memory is

changed by a processor but is not updated in storage.

dirty bit technology The ProtecTIER system uses a

“dirty-bit” feature/technology and cartridges are marked

as in-sync after the data finishes replicating from the

primary to the secondary site, so that at the time of

synchronization, the local cartridges and their DR site

replicas are identical

.

disaster recovery (DR) The process of recovering

production site data in a DR location. Disaster recovery is

useful if a disaster occurs or a situation occurs where the

production (or primary) site goes offline.

disk controller The disk controller for the TS7650

Appliance is IBM Feature Code 3708: 4.8 TB Fibre

Channel Disk Controller. Use this feature code for service

purposes.