/usr/mdec/sgivol —
configure SGI Volume Header
  
    | /usr/mdec/sgivol | [ -fq] device | 
  
    | /usr/mdec/sgivol | [ -fq]-i[-hvhsize]
      device | 
  
    | /usr/mdec/sgivol | [ -fq]-rvhfilename diskfilename
      device | 
  
    | /usr/mdec/sgivol | [ -fq]-wvhfilename diskfilename
      device | 
  
    | /usr/mdec/sgivol | [ -fq]-dvhfilename device | 
  
    | /usr/mdec/sgivol | [ -fq]-mvhfilename vhfilename
      device | 
  
    | /usr/mdec/sgivol | [ -fq]-ppartno partfirst
      partblocks parttype
      device | 
The /usr/mdec/sgivol program prepares an SGI Volume
  Header to be used to boot NetBSD. The SGI PROM is able
  to load executables within the header, which in turn are used to load the
  kernel from another file system.
The following options are available:
  - -f
- Force the operation. Do not ask the user before proceeding.
- -h
- Set the size of the newly initialized volume header in blocks. One block
      is 512 bytes. The default volume header size is 3135 blocks (1.53MB).
- -q
- Suppress output.
The numerical partition types for the volume header include:
	 0:	Volume Header
	 1:	Replicated Tracks
	 2:	Replicated Sectors
	 3:	Raw
	 4:	BSD4.2 file system
	 5:	SysV file system
	 6:	Entire Volume (all disk blocks)
	 7:	EFS
	 8:	Logical Volume
	 9:	Raw Logical Volume
	10:	XFS
	11:	XFS Log
	12:	XLV Volume
	13:	XVM Volume
 
To display the existing volume header and partition table on disk
  “sd0”:
sgivol
  sd0
To initialize a new volume header 42 512-byte blocks large on disk
    “sd0”:
sgivol -i -h 42
  sd0
To copy a file boot from the volume header
    to local file /tmp/boot on disk
  “sd0”:
sgivol -r boot
  /tmp/boot sd0
To copy a local file /usr/mdec/ip2xboot to
    the volume header as boot on disk
    “sd0”:
sgivol -w boot
  /usr/mdec/ip2xboot sd0
To delete the existing file boot from the
    volume header on disk “sd0”:
sgivol -d boot
  sd0
To move (rename) an existing file file1 to
    file2 in the volume header on disk
    “sd0”:
sgivol -m file1
  file2 sd0
To change partition 0 to type 4 (BSD4.2) beginning at block offset
    3200 and continue for 28000 blocks on disk “sd0”:
sgivol -p 0 3200
  28000 4 sd0