Copyright 2002 Wasabi Systems, Inc.
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Written by Jason R. Thorpe for Wasabi Systems, Inc.
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.Dd January 5, 2011 .Dt DKCTL 8 .Os .Sh NAME .Nm dkctl .Nd program to manipulate disks .Sh SYNOPSIS .Nm .Ar device .Nm .Ar device .Ar command .Op Ar arg Op ... .Sh DESCRIPTION .Nm allows a user or system administrator to manipulate and configure disks in various ways. It is used by specifying a disk to manipulate, the command to perform, and any arguments the command may require. .Ar device is the disk (wdN, sdN, ...) containing the wedges unless noted otherwise. If .Nm is called without any command, it displays strategy, cache, and all of the wedges of the specified device. .Sh COMMANDS The following commands are supported: l -tag -width XXstrategyXXnameXX t Ic getcache Get and display the cache enables for the specified device. t Ic setcache Ar none | r | w | rw Op Ar save Set the cache enables for the specified device. The enables are as follows: l -tag -offset indent -width XsaveX t none Disable all caches on the disk. t r Enable the read cache, and disable all other caches on the disk. t w Enable the write cache, and disable all other caches on the disk. t rw Enable both the read and write caches on the disk. t save If specified, and the cache enables are savable, saves the cache enables in the disk's non-volatile parameter storage. .El t Ic synccache Op Ar force Causes the cache on the disk to be synchronized, flushing all dirty write cache blocks to the media. If .Ar force is specified, the cache synchronization command will be issued even if the kernel does not believe that there are any dirty cache blocks in the disk's cache. t Ic keeplabel Op Ar yes | no Specify to keep or drop the in-core disklabel on the last close of the disk device. (Keep if .Ar yes is specified, drop if .Ar no is specified.) t Ic badsector Ar flush | list | retry Used for managing the kernel's bad sector list for .Xr wd 4 devices. The software bad sector list is only maintained if the option .Dq WD_SOFTBADSECT was specified on kernel configuration. l -tag -width XflushXX -offset indent t flush Clears the in kernel list of bad sectors. t list Prints out the list of bad sector ranges recorded by the kernel. t retry Flushes the in kernel list and then retries all of the previously recorded bad sectors, causing the list to self update. This option .Em can only be used with character devices. .El t Ic addwedge Ar name Ar startblk Ar blkcnt Ar ptype Define a .Dq wedge on the specified disk starting at block number .Ar startblk and spanning .Ar blkcnt blocks. You need to create the partition first with .Xr fdisk 8 or .Xr gpt 8 , .Nm will just name it. The wedge will have the volume name .Ar name and the partition type .Ar ptype . Valid choices for ptype would be .Ar unused , .Ar swap , .Ar ffs , .Ar lfs , .Ar ext2fs , .Ar cd9660 , .Ar ados , .Ar hfs , .Ar msdos , .Ar filecore , .Ar raidframe , .Ar ccd , .Ar appleufs , .Ar ntfs , and .Ar cgd .
p The device name of the virtual block device assigned to the wedge will be displayed after the wedge has been successfully created. See .Xr dk 4 for more information about disk wedges. t Ic delwedge Ar dk Delete the wedge specified by its device name .Ar dk from the specified disk. t Ic getwedgeinfo Display information about the specified disk wedge. .Ar device in this case is the wedge name. t Ic listwedges List all of the wedges configured on the specified disk. t Ic strategy Op Ar name Get and set the disk I/O scheduler (buffer queue strategy) on the drive. If you do not provide a .Ar name argument, the currently selected strategy will be shown. To set the bufq strategy, the .Ar name argument must be specified. .Ar name must be the name of one of the built-in kernel disk I/O schedulers. To get the list of supported schedulers, use the following command: d -literal -offset indent $ sysctl kern.bufq.strategies .Ed .El
p Note: The c addwedge and c delwedge commands only modify the in-kernel representation of disks; for modifying information on the disks themselves, refer to .Xr fdisk 8 or .Xr gpt 8 . .Sh SEE ALSO .Xr ioctl 2 , .Xr dk 4 , .Xr sd 4 , .Xr wd 4 , .Xr disklabel 5 , .Xr atactl 8 , .Xr fdisk 8 , .Xr gpt 8 , .Xr scsictl 8 .Sh HISTORY The .Nm command first appeared in .Nx 1.6 . .Sh AUTHORS The .Nm command was written by .An Jason R. Thorpe of Wasabi Systems, Inc.