CMDK(4D) Devices CMDK(4D)
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 magnetic removable
disks.
The cmdk device driver supports three different disk labels: fdisk
partition table, Solaris x86 VTOC and EFI/GPT.
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 therefore considerably more efficient when many bytes are
transmitted. The names of the block files are found in /dev/dsk. Raw
file names 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.
The fdisk partition 0 is to access the entire disk and is generally
used by the fdisk(8) program.
/dev/dsk/cndn[s|p]n
block device (IDE)
/dev/rdsk/cndn[s|p]n
raw device (IDE)
where:
cn
controller n.
dn
lun n (0-1).
sn
UNIX system slice n (0-15).
pn
fdisk partition (0-36).
/kernel/drv/cmdk
32-bit kernel module.
/kernel/drv/amd64/cmdk
64-bit kernel module.
See attributes(7) for descriptions of the following attributes:
+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|Architecture | x86 |
+---------------+-----------------+
lseek(2), read(2), write(2), readdir(3C), dkio(4I), scsi(5),
vfstab(5), attributes(7), fdisk(8), mount(8)
November 4, 2008 CMDK(4D)
NAME
cmdk - common disk driver
SYNOPSIS
cmdk@target, lun : [ partition | slice ]
DESCRIPTION
The cmdk device driver is a common interface to various disk devices.
The driver supports magnetic fixed disks and magnetic removable
disks.
The cmdk device driver supports three different disk labels: fdisk
partition table, Solaris x86 VTOC and EFI/GPT.
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 therefore considerably more efficient when many bytes are
transmitted. The names of the block files are found in /dev/dsk. Raw
file names 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.
The fdisk partition 0 is to access the entire disk and is generally
used by the fdisk(8) program.
FILES
/dev/dsk/cndn[s|p]n
block device (IDE)
/dev/rdsk/cndn[s|p]n
raw device (IDE)
where:
cn
controller n.
dn
lun n (0-1).
sn
UNIX system slice n (0-15).
pn
fdisk partition (0-36).
/kernel/drv/cmdk
32-bit kernel module.
/kernel/drv/amd64/cmdk
64-bit kernel module.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|Architecture | x86 |
+---------------+-----------------+
SEE ALSO
lseek(2), read(2), write(2), readdir(3C), dkio(4I), scsi(5),
vfstab(5), attributes(7), fdisk(8), mount(8)
November 4, 2008 CMDK(4D)