Devices                                                  cmdk(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 mag-
     netic 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[sp]n       block device (IDE)


     /dev/rdsk/cndn[sp]n      raw device (IDE)

                               where:





SunOS 5.11           Last change: 4 Nov 2008                    1






Devices                                                  cmdk(7D)



                               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.


ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Architecture                 x86                         
    


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




















SunOS 5.11           Last change: 4 Nov 2008                    2