Optional Procedure to Exchange Dump Priorities

This procedure removes all boot definitions, including swap and dump, from /dev/vg00 with lvrmboot and recreates them with lvlnboot . This needs to be done because lvol2 is the primary dump logical volume (0) and dump is the secondary dump logical volume (1).

You must reboot in order for these changes to take effect. Figure 3-15 shows the steps required to complete this optional procedure.

Figure 3-15. Procedure to Change Dump Priorities (Optional)

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F24

Remove the boot area entirely from vg00 with lvrmboot .

 #  lvrmboot -r /dev/vg00  

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F25

Verify that the boot area was removed with lvlnboot.

 #  lvlnboot -v  Boot Definitions for Volume Group /dev/vg00: The Boot Data Area is empty. 

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F26

Assign the root logical volume to lvol1 on /dev/vg00 with lvlnboot .

 # l  vlnboot -r lvol1 /dev/vg00  

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F27

Assign the swap to lvol2 on /dev/vg00 .

 #  lvlnboot -s lvol2 /dev/vg00  #  swapinfo  Kb       Kb      Kb    PCT    START/      Kb TYPE      AVAIL    USED    FREE  USED   LIMIT RESERVE  PRI  NAME dev      512000       0  512000    0%       0       -    1  /dev/vg00/lvol2 reserve       -   23144  -23144 memory  1671008   27324 1643684    2% 

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F28

Assign the dump to the logical volume dump on /dev/vg00 .

 #  lvlnboot -d dump /dev/vg00  

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F29

Assign the secondary dump device as lvol2 (primary swap) on lvol2 .

 #  lvlnboot -d lvol2 /dev/vg00  

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F30

Run lvlnboot to confirm that the dump and swap are properly configured with priority "0" on 2 GByte disk c0t5d0 and "1" on c0t6d0 .

 #  lvlnboot -v  # after adding lvol2 as secondary dump Boot Definitions for Volume Group /dev/vg00: Physical Volumes belonging in Root Volume Group:                    /dev/dsk/c0t6d0 (10/0.6.0) -- Boot Disk                    /dev/dsk/c1t3d0 (10/4/4.3.0) -- Boot Disk                    /dev/dsk/c0t5d0 (10/0.5.0) Root: lvol1        on:      /dev/dsk/c0t6d0                             /dev/dsk/c1t3d0 Swap: lvol2        on:      /dev/dsk/c0t6d0                             /dev/dsk/c1t3d0 Dump: dump         on:      /dev/dsk/c0t5d0, 0 Dump: dump         on:      /dev/dsk/c0t6d0, 1 

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F31

Reboot the system and run steps F21-F23 to confirm proper operation of dump devices.

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Although this procedure to reconfigure disks is for a specific system, it is useful for illustrating the many LVM commands required to perform such tasks . LVM, and disk management in general, are the areas I find consumes the most system administration time in mature HP-UX installations. There are many commands used in this procedure for which there is no way to "back out," so use caution whenever using LVM commands.

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