1.\" $NetBSD: dkctl.8,v 1.4 2002/10/01 13:40:29 wiz Exp $ 2.\" 3.\" Copyright 2002 Wasabi Systems, Inc. 4.\" All rights reserved. 5.\" 6.\" Written by Jason R. Thorpe for Wasabi Systems, Inc. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. All advertising materials mentioning features or use of this software 17.\" must display the following acknowledgement: 18.\" This product includes software developed for the NetBSD Project by 19.\" Wasabi Systems, Inc. 20.\" 4. The name of Wasabi Systems, Inc. may not be used to endorse 21.\" or promote products derived from this software without specific prior 22.\" written permission. 23.\" 24.\" THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 26.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 27.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 28.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34.\" POSSIBILITY OF SUCH DAMAGE. 35.\" 36.Dd January 9, 2002 37.Dt DKCTL 8 38.Os 39.Sh NAME 40.Nm dkctl 41.Nd a program to manipulate disks 42.Sh SYNOPSIS 43.Nm 44.Ar device 45.Ar command 46.Oo 47.Ar arg Oo ... 48.Oc 49.Oc 50.Sh DESCRIPTION 51.Nm 52allows a user or system administrator to manipulate and configure disks 53in various ways. 54It is used by specifying a disk to manipulate, the command 55to perform, and any arguments the command may require. 56.Sh COMMANDS 57The following commands are supported: 58.Pp 59.Nm getcache 60.Pp 61Get and display the cache enables for the specified device. 62.Pp 63.Nm setcache 64.Ar none | r | w | rw 65.Op Ar save 66.Pp 67Set the cache enables for the specified device. 68The enables are as follows: 69.Bl -tag -width indent 70.It none 71Disable all caches on the disk. 72.It r 73Enable the read cache, and disable all other caches on the disk. 74.It w 75Enable the write cache, and disable all other caches on the disk. 76.It rw 77Enable both the read and write caches on the disk. 78.It save 79If specified, and the cache enables are savable, saves the cache 80enables in the disk's non-volatile parameter storage. 81.El 82.Pp 83.Nm synccache 84.Op Ar force 85.Pp 86Causes the cache on the disk to be synchronized, flushing all dirty 87write cache blocks to the media. 88If 89.Ar force 90is specified, the cache synchronization command will be issued even 91if the kernel does not believe that there are any dirty cache blocks 92in the disk's cache. 93.Pp 94.Nm keeplabel 95.Op Ar yes | no 96.Pp 97Specify to keep or drop the in-core disklabel on the last close of 98the disk device. 99(Keep if 100.Ar yes 101is specified, drop if 102.Ar no 103is specified.) 104.Sh SEE ALSO 105.Xr ioctl 2 , 106.Xr sd 4 , 107.Xr wd 4 108.Sh HISTORY 109The 110.Nm 111command first appeared in 112.Nx 1.6 . 113.Sh AUTHORS 114The 115.Nm 116command was written by Jason R. Thorpe of Wasabi Systems, Inc. 117