Copyright 2002 Wasabi Systems, Inc.
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Written by Jason R. Thorpe for Wasabi Systems, Inc.
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.Dd August 30, 2004 .Dt DKCTL 8 .Os .Sh NAME .Nm dkctl .Nd a program to manipulate disks .Sh SYNOPSIS .Nm .Ar device .Ar command .Oo .Ar arg Oo ... .Oc .Oc .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. .Sh COMMANDS The following commands are supported:
p .Nm getcache
p Get and display the cache enables for the specified device.
p .Nm setcache .Ar none | r | w | rw .Op Ar save
p Set the cache enables for the specified device. The enables are as follows: l -tag -width indent 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
p .Nm synccache .Op Ar force
p 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.
p .Nm keeplabel .Op Ar yes | no
p 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.)
p .Nm badsector .Ar flush | list | retry
p Used for managing the kernel's bad sector list for wd* devices. The software bad sector list is only maintained if the option .Dq WD_SOFTBADSECT was specified on kernel configuration. l -tag -width 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 .Sh SEE ALSO .Xr ioctl 2 , .Xr sd 4 , .Xr wd 4 , .Xr disklabel 5 , .Xr atactl 8 , .Xr scsictl 8 .Sh HISTORY The .Nm command first appeared in .Nx 1.6 . .Sh AUTHORS The .Nm command was written by Jason R. Thorpe of Wasabi Systems, Inc.