Example using the menu

6.10 LPAR mode z/VM guest KVM guest

This example shows how to use fdasd to create two partitions on a z/VM® minidisk, change the type of one of the partitions, save the changes, and check the results.

About this task

This example shows you how to format a z/VM minidisk with the compatible disk layout. The minidisk has device number 193.

Procedure

  1. Call fdasd, specifying the minidisk: 
    # fdasd /dev/dasdzzz
    fdasd reads the existing data and displays the menu: 
    reading volume label: VOL1
reading vtoc : ok

Command action
   m print this menu
   p print the partition table
   n add a new partition
   d delete a partition
   v change volume serial
   t change partition type
   r re-create VTOC and delete all partitions
   u re-create VTOC re-using existing partition sizes
   s show mapping (partition number - data set name)
   q quit without saving changes
   w write table to disk and exit
Command (m for help):
  2. Use the p option to verify that no partitions are created yet on this DASD: 
    Command (m for help): p

Disk /dev/dasdzzz:
  cylinders ............: 100
  tracks per cylinder ..: 15
  blocks per track .....: 12
  bytes per block ......: 4096
  volume label .........: VOL1
  volume serial ........: 0X0193
  max partitions .......: 3

 ------------------------------- tracks -------------------------------
               Device      start      end   length   Id  System
                               2     1499     1498       unused
  3. Define two partitions, one by specifying an end track and the other by specifying a length.
    (In both cases the default start tracks are used): 
    Command (m for help): n
First track (1 track = 48 KByte) ([2]-1499):
Using default value 2
Last track or +size[c|k|M] (2-[1499]): 700
You have selected track 700
    Command (m for help): n
First track (1 track = 48 KByte) ([701]-1499):
Using default value 701
Last track or +size[c|k|M] (701-[1499]): +400
You have selected track 1100
  4. Check the results by using the p option: 
    Command (m for help): p

Disk /dev/dasdzzz:
  cylinders ............: 100
  tracks per cylinder ..: 15
  blocks per track .....: 12
  bytes per block ......: 4096
  volume label .........: VOL1
  volume serial ........: 0X0193
  max partitions .......: 3

 ------------------------------- tracks -------------------------------
               Device      start      end   length   Id  System
        /dev/dasdzzz1          2      700      699    1  Linux native
        /dev/dasdzzz2        701     1100      400    2  Linux native
                            1101     1499      399       unused
  5. Change the type of a partition: 
    Command (m for help): t

Disk /dev/dasdzzz:
  cylinders ............: 100
  tracks per cylinder ..: 15
  blocks per track .....: 12
  bytes per block ......: 4096
  volume label .........: VOL1
  volume serial ........: 0X0193
  max partitions .......: 3

 ------------------------------- tracks -------------------------------
               Device      start      end   length   Id  System
        /dev/dasdzzz1          2      700      699    1  Linux native
        /dev/dasdzzz2        701     1100      400    2  Linux native
                            1101     1499      399       unused

change partition type
partition id (use 0 to exit):

    Enter the ID of the partition you want to change; in this example partition 2: 
    partition id (use 0 to exit): 2
  6. Enter the new partition type; in this example type 2 for swap: 
    current partition type is: Linux native

    1 Linux native
    2 Linux swap
    3 Linux raid
    4 Linux lvm

new partition type: 2
  7. Check the result: 
    Command (m for help): p


Disk /dev/dasdzzz:
  cylinders ............: 100
  tracks per cylinder ..: 15
  blocks per track .....: 12
  bytes per block ......: 4096
  volume label .........: VOL1
  volume serial ........: 0X0193
  max partitions .......: 3

 ------------------------------- tracks -------------------------------
               Device      start      end   length   Id  System
        /dev/dasdzzz1          2      700      699    1  Linux native
        /dev/dasdzzz2        701     1100      400    2  Linux swap
                            1101     1499      399       unused
  8. Write the results to disk with the w option: 
    Command (m for help): w
writing VTOC...
rereading partition table...
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