NAME

sadp − disk access profiler

SYNOPSIS

sadp [ −th ] [ −d 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 n times if n is specified.  Cylinder usage and disk distance are recorded in units of sectors. 

The drive name must be the filename of a raw device in the form of prefix_cXdYsZ, where prefix uniquely defines the type of device, X specifies the controller number (starting from zero) of the stated device type, Y specifies the logical device number (starting from zero) for the device attached to the stated controller, and Z specifies the device dependent information.  For a SCSI disk, Z is the slice number for the whole disk, usually 7. 

If drive is not specified, sadp profiles all the disk drives present. 

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

EXAMPLE

The command:

sadp 900 4

will generate four tabular reports, each describing slice usage and seek distance of all disk drives during a 15-minute interval. 

SEE ALSO

mem(7). 

  —  System Performance Analysis Utilities