I'll try here to answer two posts at the same time thereby saving a little.
HP-UX is the most close to pure Unix I've seen in some time. My experience with
Solaris is very thin and although it appears very stable I think there are a
number of commands that just don't work like the standard says their suppose to.
It's a SUN thing and I won't hold it against them. Linux and HP are very close
although HP provides more short cuts via aliases. Compaq's old Ultrix (actually
DEC back in those days) was an animal all to itself, there's no comparison as
only the core was there, but not totally. I've a book of standard Unix commands
as recognized by ANSI and I haven't found one on HP that does not work as
advertised, although HP many times provides a shortcut like 'll' instead of 'ls
-al'.
As far as 32 vs. 64 bit, if your on one of the older machines, before the L
class, then your pretty much stuck with 32 bit. You can, I understand, load the
64 bit OS, but it recognizes the machine and installs itself in 'emulation' mode
which is "slower than molasses running up hill in Anchorage in mid December".
But I do notice that the 32 bit version of HP-UX 11.0 does allow some changes
long sought, namely more memory access and large file sizes.
If you've got one of the newer L, N, or best of all V class machines then the 64
bit stuff REALLY cruises. And yes exp and imp run full 64 bit too here.
MC ServiceGuard is a product that HP touts as their 'fault tolerant' solution.
Basically you install a second network card into the box dedicated to
ServiceGuard on two or more machines and create a private network with some
Ethernet thin cable. One machine is designated as the MASTER and the others are
standby slaves. All of the boxes have to have some shared disk space. The idea
is that the MASTER puts out a heartbeat via the private network every so many
seconds. As long as the slaves see the heartbeat they go on about their normal
business, whatever that may be. If the heartbeat disappears for two or more
time intervals the PRIME slave or the slave if you only have two computers,
immediately shuts down and reboots, assuming the identity, disk drives, and
tasks of the MASTER. The switch over process takes about 30 minutes. As an
aside ServiceGuard also provides the facilities of MC Lock Manager which is
required to use Oracle Parallel server. This utility provides disk file locking
between two or more computers that share disk drives. It's expensive to say the
least, complicated to setup, and can get temperamental if the environment is not
noise clean. On the other hand it really does work.
Dick Goulet
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