SADP(1M) (System Performance Analysis Utilities) SADP(1M)
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
n times if n is specified. Cylinder usage and disk distance
are recorded in units of 8 cylinders.
Valid values of device are hdsk for integral disk, sdsk for
the Small Computer Systems Interface (SCSI) disk, and fdsk
for integral floppy. Neither XDC disks nor SCSI Release 1.0
disks can be profiled using sadp. sadp can profile only one
device type per invocation. The -d option may be omitted if
the system has only one device type.
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 8 disk drives may be reported for device type hdsk or
fdsk, and up to 56 for sdsk. If drive is not specified,
sadp profiles all the disk drives specified by device, up to
the maximum of 8 for hdsk and fdsk, or 56 for sdsk.
The -t flag causes the data to be reported in tabular form.
The -h flag produces a histogram of the data. Default is
-t.
EXAMPLE
The command:
Page 1 May 1989
SADP(1M) (System Performance Analysis Utilities) SADP(1M)
sadp -d hdsk-0 900 4
will generate 4 tabular reports, each describing cylinder
usage and seek distance of hdsk disk drive 0 during a 15-
minute interval.
FILES
/dev/kmem
SEE ALSO
mem(7).
Page 2 May 1989