Update section on DK_NDRIVES (which was removed with CAM), and explain

relation to devstat(3)/(9).

Submitted-by:	ken@freebsd.org

1 files changed, 10 insertions, 9 deletions

diff --git a/usr.bin/systat/systat.1 b/usr.bin/systat/systat.1
index bbf22017c36f..64dfa35b871f 100644
--- a/usr.bin/systat/systat.1
+++ b/usr.bin/systat/systat.1
@@ -304,16 +304,17 @@ the number and percentage of the translations that were
 handled by the per process name translation cache.
 .Pp
 At the bottom left is the disk usage display.
-It reports the number of seeks, transfers, and number
-of kilobyte blocks transferred per second averaged over the
+It reports the number of
+kilobytes per transaction, transactions per second and megabytes 
+per second averaged over the 
 refresh period of the display (by default, five seconds).
-For some disks it also reports the average milliseconds per seek.
-Note that the system only keeps statistics on at most eight disks
-(this is controlled by the constant 
-.Dv DK_NDRIVE
-in
-.Aq Pa sys/dkstat.h
-as a kernel compile-time constant).
+The system keeps statistics on most every storage device.  In general, up
+to seven devices are displayed.  The devices displayed by default are the
+first devices in the kernel's device list.  See 
+.Xr devstat 3
+and 
+.Xr devstat 9
+for details on the devstat system.
 .Pp
 Under the date in the upper right hand quadrant are statistics
 on paging and swapping activity.