Document spindown constraints as given in the original commit
message[1] and later clarification provided by phk. [1] http://docs.freebsd.org/cgi/mid.cgi?200803171033.m2HAXOeN055116 Reviewed by: brueffer, phk, ed
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@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 28, 2007
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.Dd June 25, 2008
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.Dt ATACONTROL 8
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.Os
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.Sh NAME
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@ -198,6 +198,10 @@ Show detailed info about the device on
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Set or report timeout after which the
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.Ar device
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will be spun down.
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To arm the timeout the device needs at least one more request after
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setting the timeout.
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To disable spindown, set the timeout to zero.
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No further actions are needed in this case.
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.It Ic info
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Show info about the attached devices on the
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.Ar channel .
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@ -333,6 +337,23 @@ Issue the command:
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.Pp
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Now a status command will show the array rebuilding.
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.Pp
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To spin down a disk after 30 minutes run
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.Pp
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.Dl "atacontrol spindown ad6 1800"
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.Dl "dd if=/dev/ad6 of=/dev/null count=1"
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.Pp
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While any IO on the disk will arm the timer, using
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.Xr dd 1
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on the raw device will work in all cases, as when the disk is not
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opened at all.
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You can check the current setting with
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.Pp
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.Dl "atacontrol spindown ad6"
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.Pp
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You should not set a spindown timeout on a disk with
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.Pa /
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or syslog logging on it as the disk will be worn out spinning down and
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up all the time.
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.Sh SEE ALSO
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.Xr ata 4
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.Sh HISTORY
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