dkctl(8) - NetBSD Manual Pages

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


NAME

     dkctl - a 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.


COMMANDS

     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-
     lows:

     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.

     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 synchroniza-
     tion 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* devices.

     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.


SEE ALSO

     ioctl(2), sd(4), wd(4), disklabel(5)


HISTORY

     The dkctl command first appeared in NetBSD 1.6.


AUTHORS

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

NetBSD 2.0                       July 13, 2003                      NetBSD 2.0