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NetBSD 6.1.5 - man page for dkctl (netbsd section 8)

DKCTL(8)			   BSD System Manager's Manual				 DKCTL(8)

     dkctl -- program to manipulate disks

     dkctl device
     dkctl device command [arg [...]]

     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 argu-
     ments 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.

     The following commands are supported:

     getcache		 Get and display the cache enables for the specified device.

     setcache none | r | w | rw [save]
			 Set the cache enables for the specified device.  The enables are as fol-

			       none    Disable all caches on the disk.

			       r       Enable the read cache, and disable all other caches on the

			       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 stor-

     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 syn-
			 chronization command will be issued even if the kernel does not believe
			 that there are any dirty cache blocks in the disk's cache.

     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.)

     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

			       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 charac-
					 ter devices.

     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.

     delwedge dk	 Delete the wedge specified by its device name dk from the specified

     getwedgeinfo	 Display information about the specified disk wedge.  device in this case
			 is the wedge name.

     listwedges 	 List all of the wedges configured on the specified disk.

     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

			       $ sysctl kern.bufq.strategies

     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).

     ioctl(2), dk(4), sd(4), wd(4), disklabel(5), atactl(8), fdisk(8), gpt(8), scsictl(8)

     The dkctl command first appeared in NetBSD 1.6.

     The dkctl command was written by Jason R. Thorpe of Wasabi Systems, Inc.

BSD					 January 5, 2011				      BSD

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