DKCTL(8) System Manager's Manual DKCTL(8)
dkctl - control special disk operations
/usr/etc/dkctl disk command
dkctl is used to enable or disable special disk operations. In particu-
lar the enabling or disabling of verified writes (write check function-
ality) is controlled by this program.
The disk specification here is a disk name of the form /dev/rxxnp,
where xx is the controller device abbreviation (xy, sd, etc.), n is the
disk number, and p is the partition to which the operation applies.
The partition specification is simply the letter used to identify that
partition in the standard UNIX system nomenclature.
wchk This function enables write checking for disks that support it
for the named disk partition. This means that for partitions of
disks with this feature enabled, all writes are verified to have
been correctly written on the disk. This operation emphasizes
data reliability over performance, although for each implementa-
tion, the fastest reasonable method will be used (i.e., imple-
mented in hardware, if possible).
-wchk This disables write check functionality for the named disk par-
Use of the dkctl command requires super-user permissions.
There are many other features this program could control, and may in
dkio(4S), sd(4S), xy(4S)
17 June 1988 DKCTL(8)