IDS Forum

RE: Managing IDS in IBM HACMP environment

Posted By: Paul Watson
Date: Thursday, 8 May 2008, at 1:07 p.m.

In Response To: Re: Managing IDS in IBM HACMP environment (Martin Fuerderer)

Putting the Informix files on the shared disk makes for easier maintenance
as you only have one area to maintain, it also gets a round the 'split
brain' situation as there can only be one master for the shared disks.

I'm not aware of any Informix HACMP software either, you can do trivial
tests like is oninit running and how many but this is a long way from ideal.
But historically we've always scripted our own tests and forced a failover
if they detect a real error - I can't remember at time when a failover was
triggered by IDS, if the engine crashes you can just restart it without
failing over - in fact you don't want to fail over

Cheers
Paul

-----Original Message-----

- shared disks for the dbspaces (chunks) would be the easiest option.
- shared disks for the installation of IDS binary may not be an option
or may be fairly tricky or may be easy ... depends on the configuration
of your cluster and your IDS instance(s).

- the main problem would be the control of the IDS instance(s) during
failover. I'm not aware that there is any ready-to-use software
supporting IDS in a HACMP environment.
(I may be wrong on this, though.)

- in general the main problem with cluster failover is the
"split brain" situation. Each node thinks it needs to
run because the other seems to be dead, but this
is not the case. Then you have to nodes running at
the same time. Especially if they access the same
shared disk, it is a disaster.

- this situation normally is avoided by the STONITH
method (Shoot The Other Node In The Head), to be
sure that only one node is running.
For all of this, some software is needed to control
(or shoot) IDS ...

The whole thing is anything but trivial!
It can't be explained in detail in an e-mail (or two).

Art Kagel is right in that HDR is (much) easier to setup and
manage. This of course works with/for IDS only.
HDR can't control other applications/services as
it is built-in (IDS).

Regards,
Martin
--
Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management

IBM Deutschland Entwicklung GmbH
Chairman of the Supervisory Board: Martin Jetter
Board of Management: Herbert Kircher
Corporate Seat: Boeblingen, Germany
Reg.-Gericht: Amtsgericht Stuttgart, HRB 243294

ids-bounces@iiug.org wrote on 08.05.2008 17:52:23:

> About to install and setup IBS 10 on IBM p550/ AIX 5.3 HACMP
environmnet.
>
> Are there any documents /guidelines for managing IDS in such
environment?
>
> My concerns are
> (1) Can one IDS instance be shared between both nodes in the cluster or
will
> IDS have to be installed and maintained individually on each node in the

> cluster?
>
> (2)Are there special considerations for management of the logical
volumes on
>
> which IDS dbspaces reside?
>
> Hope to get some guidance on this.
>
> Regards,
> Robert
>
>

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Messages In This Thread

• Managing IDS in IBM HACMP environment
  ROBERT ROMERO -- Thursday, 8 May 2008, at 11:52 a.m.
  • Re: Managing IDS in IBM HACMP environment
    Art Kagel -- Thursday, 8 May 2008, at 12:04 p.m.
    • RE: Managing IDS in IBM HACMP environment
      Paul Watson -- Thursday, 8 May 2008, at 12:56 p.m.
      • Re: Managing IDS in IBM HACMP environment
        Art Kagel -- Thursday, 8 May 2008, at 1:31 p.m.
  • Re: Managing IDS in IBM HACMP environment
    Martin Fuerderer -- Thursday, 8 May 2008, at 12:57 p.m.
    • RE: Managing IDS in IBM HACMP environment
      Paul Watson -- Thursday, 8 May 2008, at 1:07 p.m.
      • Re: RE: Managing IDS in IBM HACMP environment
        ROBERT ROMERO -- Thursday, 8 May 2008, at 4:58 p.m.
        • RE: RE: Managing IDS in IBM HACMP environment
          Paul Watson -- Thursday, 8 May 2008, at 5:08 p.m.
          • RE: RE: Managing IDS in IBM HACMP environment
            Link, David A -- Thursday, 8 May 2008, at 5:25 p.m.
        • RE: Managing IDS in IBM HACMP environment
          mosserp@wellsfargo.com -- Tuesday, 20 May 2008, at 5:52 p.m.

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