--- cci/usr/src/man/man1/iostat.1	2019/07/28 12:24:19	1.1
+++ cci/usr/src/man/man1/iostat.1	2019/07/28 12:26:37	1.1.1.2
@@ -4,28 +4,59 @@
 iostat \- report I/O statistics
 .SH SYNOPSIS
 .B iostat
-[ interval [ count ] ]
+[ [-01r] interval [ count ] ]
 .SH DESCRIPTION
 .I Iostat
-iteratively reports the number of characters read and written to terminals,
-and, for each disk, the number of seeks transfers per second, kilobytes
-transfered per second,
-and the milliseconds per average seek.
+iteratively reports the number of 
+characters read and written to terminals,
+and, for each disk, the number of 
+seeks per second, transfers per second, 
+kilobytes transferred per second,
+and the milliseconds per average 
+transfer which include the seek time.
 It also gives the percentage of time the system has
-spent in user mode, in user mode running low priority (niced) processes,
+spent in user mode, in user mode running 
+low priority (niced) processes,
 in system mode, and idling.
 .PP
-To compute this information, for each disk, seeks and data transfer completions
+To compute this information, 
+for each disk, seeks and data transfer completions
 and number of words transferred are counted;
 for terminals collectively, the number
 of input and output characters are counted.
 Also, each sixtieth of a second,
 the state of each disk is examined
 and a tally is made if the disk is active.
-From these numbers and given the transfer rates
-of the devices it is possible to determine
+From these numbers, and given the transfer rates
+of the devices, it is possible to determine
 average seek times for each device.
 .PP
+The POWER 6/32 can support up to 32 disk drives.  
+.I Iostat 
+can only display 16 drives at one time.
+The 
+.B \-0
+argument will display the first 16 mounted disk drives, 
+and the
+.B \-1
+argument will display the second 16 mounted disk drives. 
+These options take effect only if the system has more
+than 16 mounted drives.
+The
+.B \-0
+argument is the default.  
+Any time during the display, you can type in
+a 0, 1 or r to change the display.
+.PP
+The
+.B \-r
+argument, switches between displaying the 
+first and second 16 disk drives, i.e., it switches 
+back and forth between the 0 and 1 options.
+This option takes effect only if the system has more
+than 16 mounted drives.
+The duration for each set of drives will be [interval]/2 .
+.PP
 The optional
 .I interval
 argument causes