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Document spindown constraints as given in the original commit

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message[1] and later clarification provided by phk.

[1] http://docs.freebsd.org/cgi/mid.cgi?200803171033.m2HAXOeN055116

Reviewed by:	brueffer, phk, ed
This commit is contained in:
Bjoern A. Zeeb 2008-06-25 18:11:22 +00:00
parent 9d7a57e916
commit 9a8398173d
1 changed files with 22 additions and 1 deletions
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23
sbin/atacontrol/atacontrol.8
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@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd November 28, 2007
.Dd June 25, 2008
.Dt ATACONTROL 8
.Os
.Sh NAME
@ -198,6 +198,10 @@ Show detailed info about the device on
Set or report timeout after which the
.Ar device
will be spun down.
To arm the timeout the device needs at least one more request after
setting the timeout.
To disable spindown, set the timeout to zero.
No further actions are needed in this case.
.It Ic info
Show info about the attached devices on the
.Ar channel .
@ -333,6 +337,23 @@ Issue the command:
.Pp
Now a status command will show the array rebuilding.
.Pp
To spin down a disk after 30 minutes run
.Pp
.Dl "atacontrol spindown ad6 1800"
.Dl "dd if=/dev/ad6 of=/dev/null count=1"
.Pp
While any IO on the disk will arm the timer, using
.Xr dd 1
on the raw device will work in all cases, as when the disk is not
opened at all.
You can check the current setting with
.Pp
.Dl "atacontrol spindown ad6"
.Pp
You should not set a spindown timeout on a disk with
.Pa /
or syslog logging on it as the disk will be worn out spinning down and
up all the time.
.Sh SEE ALSO
.Xr ata 4
.Sh HISTORY