cmdk - common disk driver
cmdk@target, lun : [ partition | slice ]
The cmdk device driver is a common interface to various disk
devices. The driver supports magnetic fixed disks and mag-
netic removable disks.
The block-files access the disk using the system's normal
buffering mechanism and are read and written without regard
to physical disk records. There is also a "raw" interface
that provides for direct transmission between the disk and
the user's read or write buffer. A single read or write
call usually results in one I/O operation; raw I/O is there-
fore considerably more efficient when many bytes are
transmitted. The names of the block files are found in
/dev/dsk; the names of the raw files are found in /dev/rdsk.
I/O requests to the magnetic disk must have an offset and
transfer length that is a multiple of 512 bytes or the
driver returns an EINVAL error.
Slice 0 is normally used for the root file system on a disk,
slice 1 as a paging area (for example, swap), and slice 2
for backing up the entire fdisk partition for Solaris
software. Other slices may be used for usr file systems or
system reserved area.
Fdisk partition 0 is to access the entire disk and is gen-
erally used by the fdisk(1M) program.
/dev/dsk/c ndn[ s|p]n
block device (IDE)
/dev/rdsk/cn dn[s|p] n
raw device (IDE)
cn controller n
dn lun n (0-7)
sn UNIX system slice n (0-15)
pn fdisk partition (0)
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Architecture | x86 |
fdisk(1M), mount(1M), lseek(2), read(2), write(2),
readdir(3C), scsi(4), vfstab(4), attributes(5), dkio(7I)
Man(1) output converted with