Update section on DK_NDRIVES (which was removed with CAM), and explain
relation to devstat(3)/(9). Submitted-by: ken@freebsd.org
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=42105
@ -304,16 +304,17 @@ the number and percentage of the translations that were
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handled by the per process name translation cache.
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.Pp
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At the bottom left is the disk usage display.
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It reports the number of seeks, transfers, and number
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of kilobyte blocks transferred per second averaged over the
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It reports the number of
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kilobytes per transaction, transactions per second and megabytes
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per second averaged over the
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refresh period of the display (by default, five seconds).
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For some disks it also reports the average milliseconds per seek.
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Note that the system only keeps statistics on at most eight disks
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(this is controlled by the constant
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.Dv DK_NDRIVE
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in
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.Aq Pa sys/dkstat.h
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as a kernel compile-time constant).
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The system keeps statistics on most every storage device. In general, up
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to seven devices are displayed. The devices displayed by default are the
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first devices in the kernel's device list. See
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.Xr devstat 3
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and
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.Xr devstat 9
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for details on the devstat system.
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.Pp
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Under the date in the upper right hand quadrant are statistics
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on paging and swapping activity.
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