One thing that AIX had before hpux is the ability to dynamically increase
the size of its lvols.  HP can now do it (and has been able to for a
couple of years), but AIX has had this feature for a long time (and I was
very envious of it until hp finally added it into its unix).
-Bob
On Wed, 31 Mar 2004, Jay West wrote:
  Lyle wrote...
  I've worked extensively with Solaris, IRIX,
Linux, and AIX for over twenty
 years (not Linux - only since release 0.9?)  - and in my opinion, AIX has
 features that from it's inception were better than it's competitors - 
Logical
  Volumes when no one else had them - and SMIT -
which made system
 administration simple.  I've worked with AIX on accounts which had 
 migrated
  from mainframes to AIX - and was pleased to find
it could scale to meet 
 the
  challenge. 
 HP has had LVM for as long as I can remember as an optional add-on, and SAM
 even longer. Wasn't SAM around long before SMIT? I vaguely recall thinking
 that SAM came out first and IBM copied the idea but I'm not at all sure at
 this. Anyone know for sure and can set me straight?
 Jay