NAME

sadp − disk access profiler

SYNOPSIS

sadp [ −th ] [ −d device[−drive] ] s [ n ]

DESCRIPTION

Sadp reports disk access location and seek distance, in tabular or histogram form.  It samples disk activity once every second during an interval of s seconds.  This is done repeatedly if n is specified.  Cylinder usage and disk distance are recorded in units of eight cylinders. 

Valid values of device are rp06, rm05, and disk.  Drive specifies the disk drives and it may be:

a drive number in the range supported by device,
two numbers separated by a minus (indicating an inclusive range),

or

a list of drive numbers separated by commas. 

Up to eight disk drives may be reported.  The −d option may be omitted, if only one device is present. 

The −t flag causes the data to be reported in tabular form.  The −h flag produces a histogram on the printer of the data.  Default is −t. 

EXAMPLE

sadp −d rp06−0 900 4

will generate 4 tabular reports, each describing cylinder usage and seek distance of rp06 disk drive 0 during a 15 minute interval. 

FILES

/dev/kmem

Version 2.1  —  January 02, 1985