Sun Microsystems, Inc.
spacerspacer
spacer   www.sun.com docs.sun.com | | |  
spacer
black dot
   
A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z
    
 
Devicescmdk(7D)


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 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; 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 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 (0-7)
sn
UNIX system slice n (0-15)
pn
fdisk partition (0)

ATTRIBUTES

 

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
ArchitectureIA

SEE ALSO

 

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


SunOS 5.9Go To TopLast Changed 9 May 2001

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.