NAME
dkctl —
program to manipulate
disks
SYNOPSIS
dkctl |
device command
[arg
[...]] |
DESCRIPTION
dkctl 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.
device is the disk (wdN, sdN, ...) containing the wedges
unless noted otherwise. If
dkctl is called without any
command, it displays strategy, cache, and all of the wedges of the specified
device.
COMMANDS
The following commands are supported:
-
-
- addwedge
name startblk
blkcnt ptype
- Define a “wedge” on the specified disk starting
at block number startblk and spanning
blkcnt blocks. You need to create the partition
first with fdisk(8) or
gpt(8), dkctl
will just name it. The wedge will have the volume name
name and the partition type
ptype. Valid choices for ptype would be
unused, swap,
ffs, lfs,
ext2fs, cd9660,
ados, hfs,
msdos, filecore,
raidframe, ccd,
appleufs, ntfs, and
cgd.
The device name of the virtual block device assigned to the wedge will be
displayed after the wedge has been successfully created. See
dk(4) for more information about
disk wedges.
-
-
- badsector
flush | list |
retry
- Used for managing the kernel's bad sector list for
wd(4) devices. The software bad
sector list is only maintained if the option “WD_SOFTBADSECT”
was specified on kernel configuration.
-
-
- flush
- Clears the in kernel list of bad sectors.
-
-
- list
- Prints out the list of bad sector ranges recorded by
the kernel.
-
-
- retry
- Flushes the in kernel list and then retries all of the
previously recorded bad sectors, causing the list to self update. This
option can only be used with character devices.
-
-
- delwedge
dk
- Delete the wedge specified by its device name
dk from the specified disk.
-
-
- getcache
- Get and display the cache enables for the specified
device.
-
-
- getwedgeinfo
- Display information about the specified disk wedge.
device in this case is the wedge name.
-
-
- keeplabel
[yes |
no]
- Specify to keep or drop the in-core disklabel on the last
close of the disk device. (Keep if yes is specified,
drop if no is specified.)
-
-
- listwedges
- List all of the wedges configured on the specified
disk.
-
-
- makewedges
- Delete all wedges configured on the specified disk, and
autodiscover the wedges again. Wedges that are in use are not deleted and
conflicting or overlapping wedges are not created. You need to list wedges
to find out what has changed.
-
-
- setcache
none | r |
w | rw
[save]
- Set the cache enables for the specified device. The enables
are as follows:
-
-
- none
- Disable all caches on the disk.
-
-
- r
- Enable the read cache, and disable all other caches on
the disk.
-
-
- w
- Enable the write cache, and disable all other caches on
the disk.
-
-
- rw
- Enable both the read and write caches on the disk.
-
-
- save
- If specified, and the cache enables are savable, saves
the cache enables in the disk's non-volatile parameter storage.
-
-
- strategy
[name]
- Get and set the disk I/O scheduler (buffer queue strategy)
on the drive. If you do not provide a name argument,
the currently selected strategy will be shown. To set the bufq strategy,
the name argument must be specified.
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:
$ sysctl kern.bufq.strategies
-
-
- synccache
[force]
- Causes the cache on the disk to be synchronized, flushing
all dirty write cache blocks to the media. If 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.
Note: The
addwedge and
delwedge commands
only modify the in-kernel representation of disks; for modifying information
on the disks themselves, refer to
fdisk(8) or
gpt(8).
SEE ALSO
ioctl(2),
dk(4),
sd(4),
wd(4),
disklabel(5),
atactl(8),
fdisk(8),
gpt(8),
scsictl(8)
HISTORY
The
dkctl command first appeared in
NetBSD
1.6.
AUTHORS
The
dkctl command was written by
Jason R.
Thorpe of Wasabi Systems, Inc.