System Administration Commands                         nscadm(1M)



NAME
     nscadm - network storage control utility

SYNOPSIS
     nscadm freeze device


     nscadm unfreeze device


     nscadm isfrozen device


DESCRIPTION
     The nscadm command performs several network storage  control
     functions.


     The nscadm freeze command closes existing references to  the
     specified  device,  and  blocks future accesses. This allows
     maintenance of virtual volume device drivers  (for  example,
     RAID  0,  RAID  1,  RAID 5) to be performed without shutting
     down the system.


     The nscadm unfreeze command reverses the effects  of  nscadm
     freeze for the specified device.


     The nscadm isfrozen command returns the  current  status  of
     the specified device.

OPTIONS
     The nscadm command supports the following option.

     -h           Display the usage menu.


OPERANDS
     The nscadm command line supports the following operand.

     device

         Specifies the storage device to be acted upon by nscadm.


EXIT STATUS
     For the freeze and unfreeze, subcommands nscadm returns  the
     following exit values:

     0            Success




SunOS 5.11           Last change: 2 Oct 2007                    1






System Administration Commands                         nscadm(1M)



     255          Error



     For the isfrozen subcommand, nscadm  returns  the  following
     exit values:

     0            Device is currently frozen.


     1            Device is not currently frozen.


     255          Error


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



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Availability                 SUNWscmr, SUNWscmu          
    
     Interface Stability          Evolving                    
    


SEE ALSO
     scmadm(1M), attributes(5)






















SunOS 5.11           Last change: 2 Oct 2007                    2