Unix‎ > ‎Solaris‎ > ‎Solaris man pages‎ > ‎1m‎ > ‎


     ramdiskadm - administer ramdisk pseudo device

     /usr/sbin/ramdiskadm -a name size [g | m | k | b]

     /usr/sbin/ramdiskadm -d name


     The ramdiskadm command administers ramdisk(7D), the  ramdisk
     driver. Use ramdiskadm to create a new named ramdisk device,
     delete an existing named ramdisk, or list information  about
     existing ramdisks.

     Ramdisks created using ramdiskadm are not persistent  across

     The following options are supported:

     -a name size

         Create a  ramdisk  named  name  of  size  size  and  its
         corresponding block and character device nodes.

         name must be composed only of the characters  a-z,  A-Z,
         0-9, _ (underbar), and - (hyphen), but it must not begin
         with a hyphen. It must be no  more  than  32  characters
         long. Ramdisk names must be unique.

         The size can be a decimal number, or, when prefixed with
         0x,  a  hexadecimal  number, and can specify the size in
         bytes (no suffix), 512-byte blocks (suffix b), kilobytes
         (suffix  k),  megabytes  (suffix m) or gigabytes (suffix
         g). The size of the ramdisk actually  created  might  be
         larger  than  that  specified, depending on the hardware

         If the named ramdisk is successfully created, its  block
         device path is printed on standard out.

     -d name

         Delete an existing ramdisk of the name name.  This  com-
         mand  succeeds  only when the named ramdisk is not open.
         The associated memory is freed and the device nodes  are

         You can delete only ramdisks created  using  ramdiskadm.
         It  is not possible to delete a ramdisk that was created
         during the boot process.

     Without options, ramdiskadm  lists  any  existing  ramdisks,
     their sizes (in decimal), and whether they can be removed by
     ramdiskadm (see the description of the -d option, above).

     Example 1: Creating a 2MB Ramdisk Named mydisk

     # ramdiskadm -a mydisk 2m

     Example 2: Listing All Ramdisks

     # ramdiskadm
     Block Device                   Size  Removable
     /dev/ramdisk/miniroot     134217728    No
     /dev/ramdisk/certfs         1048576    No
     /dev/ramdisk/mydisk         2097152    Yes

     ramdiskadm returns the following exit values:


         Successful completion.


         An error occurred.

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

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWcsr                     |
    | Interface Stability         | Evolving                    |

     attributes(5), ramdisk(7D)

     The abilities of ramdiskadm and the privilege level  of  the
     person  who  uses  the utility are controlled by the permis-
     sions of /dev/ramdiskctl. Read access  allows  query  opera-
     tions, for example, listing device information. Write access
     is required to do any state-changing operations,  for  exam-
     ple, creating or deleting ramdisks.

     As shipped, /dev/ramdiskctl is owned by root, in group  sys,
     and mode 0644, so all users can do query operations but only
     root can perform state-changing operations. An administrator
     can give write access to non-privileged users, allowing them
     to add or delete ramdisks. However,  granting  such  ability
     entails  considerable  risk; such privileges should be given
     only to a trusted group.

Man pages from Solaris 10 Update 8. See docs.sun.com and www.oracle.com for further documentation and Solaris information.