IDS Forum

HDR

Posted By: ANDREW PISTOCCHI
Date: Thursday, 13 August 2009, at 9:46 a.m.

I'm getting ready to turn on HDR between our production site and our D/R
site located 7 miles away. We are running Jenzabar CX on Informix 10
and HPUX 11i v2. Our 2 servers are connected via a 20 MB pipe. I've
gone through the documentation but I have some questions below. We have
a very busy system so I'm trying to avoid little downtime on our
production site.

1. We don't want our DR server to take over automatically in any
case. If we have a planned shutdown of production, I want to manually
get the D/R site ready. Would I set the DRAUTO parameter in the
ONCONFIG file to 0 - Manual? And do I do this on the primary server
only?

2. Are there any other settings in the ONCONFIG file I need to
change? I've seen other DR parameters in the documentation, i.e.
DRIDXAUTO, DRINTERVAL, etc. And again, just on the primary server?

3. Can I use ontape -r? This is what I've been using for a full
restore on my D/R box. When beginning replication, the documentation
says to use ontape -p? Just curious what the difference is between the
two.

4. From most of the readings, I would think I would be using
asynchronous communication, correct? Is this also defined on just the
primary? What is the difference between the synchronous and
asynchronous communication?

5. Once I have replication going, there may be times where I need
to do maintenance on one or both of the servers. What would be the
process for stopping HDR on both servers but keeping my production
engine up and running? I want to develop a good procedure, if I'm out
of town or not available and for whatever reason, a backup admin needs
to turn HDR off but keep production running. My main concern is there a
need to stop the Informix engine on production?

6. Finally, let's just say I had HDR turned off for several hours
and I'm ready to turn on again. Do I need to go through the steps again
including the full tape restore or can it pickup by starting HDR again?

My boss is pressuring me to get this working since we are in hurricane
season. Right now, my plan is to run a complete restore using HP's
Ignite for the file system and then restore the Informix database from
tape. This works but is a timely process. Any help would be
appreciated. Thanks.

Andy Pistocchi

DBA / Systems Administrator

The University of Tampa

813-257-3196

Messages In This Thread

• HDR
  ANDREW PISTOCCHI -- Thursday, 13 August 2009, at 9:46 a.m.
  • Re: HDR
    Art Kagel -- Thursday, 13 August 2009, at 10:18 a.m.
    • RE: HDR
      mosserp@wellsfargo.com -- Friday, 14 August 2009, at 1:57 p.m.
      • RE: HDR
        Madison Pruet -- Friday, 14 August 2009, at 4:35 p.m.
      • Re: RE: HDR
        PETER LANE -- Tuesday, 18 August 2009, at 12:40 p.m.
        • RE: HDR
          mosserp@wellsfargo.com -- Tuesday, 18 August 2009, at 2:07 p.m.
  • Re: HDR
    Madison Pruet -- Thursday, 13 August 2009, at 10:20 a.m.

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