Adaptec AHA-1540CP Betriebsanweisung PDF herunterladen (Seite 63)

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Novell NetWare Installation

Optimizing Performance

The Adaptec 7800 Family SCSI Bus Master firmware increases the SCSI

performance of the Adaptec 7800 Family host adapters under multitasking

environments. The firmware uses a paging mechanism to handle up to 255

simultaneous SCSI commands. The sequencer can simultaneously manage

up to 128 tagged, or 1 nontagged, SCSI commands for each SCSI device,

up to a limit of 255 SCSI commands. The firmware can queue as many

commands as the operating system is able to send to the host adapter. To set

this feature, enter the following command:

max_tags=

In general, a low number of max_tags gives better sequential performance,

and a high number a better random performance.

Note:

A large number of max_tags can also cause starvation

problems leading to deactivations with some drives.

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Adaptec AHA-1540CP Betriebsanweisung Seite 63