Kimberly,
Thanks! In our case the ServiceGuard slave was also being used as a
development server so as to reap some extra benefits from the machines
existence. Consequently when it lost contact with the master & started the
shutdown process it would send a message to the wall that it was switching over
then take a 5 minute nap. This cycle repeated itself for a total of 20 minutes
to give the duhvelepors time to save their work and log off.
Dick Goulet
____________________Reply Separator____________________
Author: Kimberly Smith <[EMAIL PROTECTED]>
Date: 3/21/2001 4:50 PM
Hey, good post. I pretty much agree with all of it except for the length
of time to fail over via ServiceGuard. It must be dependant on how much you
are failing over because ours is no more then 10 mins. for everything to
completely fail over and be running.
Are you sure that exp and imp run 64 bit? According to Oracle they did not
make that a 64 bit executable. I have never checked mine because I really
don't care. That is with 8.1.5. They may have changed that in later
releases.
-----Original Message-----
Sent: Wednesday, March 21, 2001 2:37 PM
To: Multiple recipients of list ORACLE-L
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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