====== Mirror and unmirror rootvg  ======

==== Unmirror rootvg ==== 

  - remove the bad mirror copy : ''unmirrorvg -c 1 rootvg hdisk0''
  - recreate bosboot for each disk containing hd5 lv : ''bosboot -ad hdisk1''
  - identify the sysdump device : ''sysdumpdev -l''
  - if the lv was on the bad disk, change it : ''sysdumpdev -Pp /dev/hd6''
  - remove the logical volume : ''rmlv hd7''
  - remove the bad disk from the rootvg : ''reducevg rootvg hdisk0''

==== Mirror rootvg ====

  - add the new disk to the rootvg : ''extendvg -f rootvg hdisk0''
  - mirror the rootvg : ''mirrorvg -S -c 2 rootvg''
  - recreate bosboot for each disk containing hd5 lv : ''bosboot -ad hdisk0 ; bosboot -ad hdisk1''
  - check the bootlist : ''bootlist -m normal -o''
  - Add each bootable disk in the bootlist : ''bootlist -m normal hdisk0 hdisk1''

==== Add sysdump device ====

  - identify the sysdump device : ''sysdumpdev -l''
  - estimate the sysdump size needed (in bytes) : ''sysdempdev -e''
  - create a logical volume : ''mklv -y hd7 -t sysdump rootvg 10 hdisk0''
  - change the destination of the sysdump : ''sysdumpdev -Pp /dev/hd7''
  
===== Increase mirror sychronization speed =====

To parallelize the mirror copy you can specify how many simultaneous LPs to sync. This will speed up your mirror.
 
If you set the parameter **NUM_PARALLEL_LPS=24** for example in /etc/environment then logout and login again, do a: syncvg -v rootvg &

===== Recreate boot logical volume =====

<cli prompt='#'>
# mklv -y hd5 -t boot rootvg 1 hdisk0
# bosboot -ad /dev/hdisk0 -l hd5
# bootlist -m normal -o
</cli>