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AMASS Overview
GL-8 Glossary 6-00026-01 Rev A
nonresident file
A nonresident file is a file whose
contents have been migrated to a storage
device. The file is nonresident on the
client’s machine but DataMgr leaves
behind a stub file.
O
optical
Types of optical platters are described
below:
• MO (Magneto Optical) is rewritable
optical. It uses both magnets and lasers
to write and read data on a plastic disc
having a magnetic layer. Data is
written when the laser beam heats bits
on the disc’s magnetic layer that are
then magnetically polarized by the
drive’s magnet.
• Ablative™ is an IBM term for the
technology used to make WORM
media. Lasers burn the write into the
media thus ensuring that the media is
Write-Once Ready-Many (WORM).
• CCW (Continuous Composite Writes)
use the erasable (MO) method to write
files onto a disc but then locks the files
to the media with software.
• LIMDOW (Light Intensity Modulation
Direct OverWrite) speeds up the
process of writing to MO discs.
LIMDOW discs have one memory
layer instead of two and consequently
require only one pass to write instead
of two.
Offline Media Manager
If media has been removed from a
library, Offline Media Manager, an
optional feature on AMASS that allows
you to access the offline media. When a
file is accessed on offline media, a
prompt asks the operator to load the
correct volume into a drive so the request
can be satisfied.
R
RAID
Redundant Array of Independent Disks.
Technique for using a group of disk
drives to improve performance, data
availability, or both.
resident file
All files before they are migrated by
DataMgr are resident files.
RPC
Remote Procedure Call. Process that
supplies a program a set of procedures
that can be called remotely.