cmdk(7D) Devices cmdk(7D)NAMEcmdk - 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 par‐
tition 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 transmit‐
ted. 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(1M) 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(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Architecture │x86 │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOfdisk(1M), mount(1M), lseek(2), read(2), write(2), readdir(3C),
scsi(4), vfstab(4), attributes(5), dkio(7I)SunOS 5.11 4 Nov 2008 cmdk(7D)