ADIC 6-00026-01 Rev A Increased Throughput

AMASS Overview

Increased Throughput

As an aid in volume verification, the system administrator enters either a bar code or a user-defined label when introducing a volume to the File System Database. At the same time, AMASS assigns the volume a unique numerical ID. From then on, AMASS tracks the volume by this unique identifier and verifies the volume by using either bar codes or headers.

The way AMASS handles the operations listed below has increased throughput thereby improving performance:

•Tape rewind and eject operations run asynchronously. Tapes are returned to their home storage slots depending on which drive first becomes available.

•Operating systems that support asynchronous operations only: IO requests are asynchronously queued when you enable this parameter during AMASS installation.

Scattered Writes	When AMASS receives more than one request to write to the
Improves	same volume group, AMASS uses a single drive, by default, to
Performance	write to one volume at a time. However, you can improve
	performance by enabling scattered writes.

6-00026-01 Rev A Online Archiving with AMASS 1-15