man/man7d/cmdk.7d

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 cmdk 7D "4 Nov 2008" "SunOS 5.11" "Devices"
 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(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 TYPEATTRIBUTE VALUE
Architecturex86


 SEE ALSO

fdisk(1M), mount(1M), lseek(2), read(2),
write(2), readdir(3C), scsi(4), vfstab(4),
attributes(5), dkio(7I)