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scsictl Tips

Oracle Tips by Burleson

Disk I/O Tuning:  HP-UX SCSI Tuning with scsictl

This tunable sets the maximum data size the SCSI subsystem will accept for an I/O.  Depending on the device's characteristics and the device driver configuration, the maximum size allowed by the SCSI subsystem for a particular SCSI device might be lower than or equal to this tunable parameters value.  It will never be greater.

The only time this parameter can be adjusted above one megabyte is when you have a V-Class system where it can be raised to 32 MB.

Using the scsictl command

The scsictl command allows adjustment of the parameters for SCSI on a HP-UX platform.  The basic format for the scsictl command is:

scsictl [-akq] [-c command]... [-m mode[= value]]... device

The scsictl command recognizes the options listed in Table 3-3.

The above text is an excerpt from:

Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle Databases
ISBN 0-9745993-4-4 

by Mike Ault

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