After you've got it all up and running, I reccommend you run a nightly job to check 
what accounts have been installed on the system volume disks (i.e. dev 1 which 
can't be mirrored) 

You will end up installing new software by accident (or by design) 
onto the system volumes, rather than the mirrored volumes

B.T.W I checked with HP - you cannot move spoolfiles (which live in Account HPSPOOL)
onto private volume sets - therefore these cannot be mirrored).  

Here's a fragment of my job stream  - it uses MPEX.  If it finds any files (except for those
excluded in the fileset) , the STDLIST is sent to my local printer.


!comment
!SETVAR CIERROR 0
!run mpex.pub.vesoft
%listf  @[log in to unmask]@ - @[log in to unmask] - /3000devs/@/@ - @[log in to unmask] - @[log in to unmask] - @[log in to unmask] - 
@[log in to unmask] - @[log in to unmask] - @[log in to unmask] - @[log in to unmask] - @[log in to unmask] - @[log in to unmask] - @.
@.TELESUP (  ( not ishidden) and ( ondevice(1) or ondevice(25) or ondevice(26) )
  ) ,2
!IF CIERROR <> 431
!   TELLOP files have been found on the system
!   TELLOP volume set - please warn/report to..... etc
!   comment print this STDLIST 
!   SPOOLF @;PRI=8;SELEQ=[JOBNUM=J!HPJOBNUM] ;SHOW
!ENDIF
!EXIT