IDS Forum

Re: HP-UX PA-RISC/Itanium

Posted By: ART KAGEL, BLOOMBERG/ 731 LEXIN
Date: Wednesday, 1 November 2006, at 11:23 a.m.

In Response To: Re: HP-UX PA-RISC/Itanium (Wiesiek Glod)

Please see Ron Macneil's post and my post in response earlier today where Ron
comments that HDR will not work for you.

Comments on the past problems you've had with IDS replication:

> - programmers and aplication errors/crashing HDR crashing

In the latest releases this is a rare problem. However, since you'll have to
use ER that's really not a problem.

> - very important reason spaces on disks: currently: 1TB + 1TB BC0 + space on
tapes
> - on HDR replication: 1TB + 1TB BC0 + 1TB HDR + space on tape

Yes any replication must suplicate the disk. On the other hand you double your
protection against drive/controller/array failure trashing all of your data. I
count the additional disk costs as minor compared to the potential for loss.

> - in my opinion simples split/pair XP arrary users have break only a few
seconds, than split HDR replication, I must down ids , but I'm not sure ...

Even if you split the array and start up the instance on the backup machine
client users and applications still have to reconnect to the new server! If you
use server GROUP names for connection ids instead of servernames the group
failover to the backup is automatic on the reconnection request with no manual
changes needed. DBPATH is also supposed to work but there have been versions of
the Client iConnect where that was broken so I've come to trust the server
group mechanism developed for ER instead.

Art S. Kagel

----- Original Message -----
From: Wiesiek Glod <ids@iiug.org>
At: 11/01 5:28:16

Thank you for response ...
Another reasons below ;-/

On Tue, 2006-10-31 at 21:41 -0500, ART KAGEL, BLOOMBERG/ 731 LEXIN
wrote:
> No you cannot do that. The platforms are different, floating point formats
are

Can I simple check this, for example is the application
using this extension ?

> different, other things also. Even if the disk layouts and binary
> representations of non-floating point values happened to be identical I

Yes is identical.

> wouldn't
> trust such a setup with my business.

It's my opinion the same ;-|

>
> What you can do is set up a backup server on the PA-RISC and primary on the
> Itanium using Informix IDS HDR replication with independent disks on each
> machine for the database servers. If you have to failover to the backup
you'd
> just switch the backup server from secondary mode to primary mode and voila!

Yes and NO, On this time We have implemented on all
machine external backup on XP array BC, this works
OK. This situation below:

- 3/day we blocks IDS
- pair XP volume
- split XP volume
- unblock IDS
- backing logs to tape

- on very danger operation on database
server we are doing BC and very simple
recover data if danger operation
ended badly ...

We implemented HDR past two years ago, and We
had a few problems:;

- programmers and aplication errors/crashing
HDR crashing
- very important reason spaces on disks:
currently: 1TB + 1TB BC0 + space on tapes
- on HDR replication:
1TB + 1TB BC0 + 1TB HDR + space on tape
- in my opinion simples split/pair XP arrary
users have break only a few seconds, than
split HDR replication, I must down ids , but
I'm not sure ...

If you have any experience and sugestions please
send me ...

>
> Art S. Kagel
>
> ----- Original Message -----
> From: Wiesiek Glod <ids@iiug.org>
> At: 10/31 18:32:44
>
> Hi,
>
> Currently in my Company we are have:
>
> - PA-RISC 64 bit servers RP74xx and L2000 class
> - all servers working with MC/SG application
> cluster connected to SAN storage XP Array
> - on this servers works IDS 7.31 and 9.40
> - 7.31 stayed only on PA-RISC
>
> We will plan buy Itanium machine, connect
> to MC/SG and XP array. Next steep I will
> install on this machine IDS 9.40 on itanium
> platform, and reconnect storage (LVM/chnks)
> from PA-RISC to Itanium. By the way configuration
> will be identical on PA-RISC and Itanium.
> In this configuration Itanium machine will be
> master and one PA-RISC machine will be stanby.
> On all machine version OS are identical.
>
> My questions:
>
> Is this possible ?
>
> Internal database structure are the same
> on PA-RISC 64bit 9.40 and Itanium 9.40 ?
>
> Best regards ...
>

Have a nice day ...
--
wkg

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Messages In This Thread

• HP-UX PA-RISC/Itanium
  Wiesiek Glod -- Tuesday, 31 October 2006, at 4:10 p.m.
  • Re: HP-UX PA-RISC/Itanium
    ART KAGEL, BLOOMBERG/ 731 LEXIN -- Tuesday, 31 October 2006, at 9:41 p.m.
    • Re: HP-UX PA-RISC/Itanium
      Wiesiek Glod -- Wednesday, 1 November 2006, at 5:19 a.m.
      • Re: HP-UX PA-RISC/Itanium
        ART KAGEL, BLOOMBERG/ 731 LEXIN -- Wednesday, 1 November 2006, at 11:23 a.m.
    • RE: HP-UX PA-RISC/Itanium
      Ron MacNeil -- Wednesday, 1 November 2006, at 9:17 a.m.
      • RE: HP-UX PA-RISC/Itanium
        ART KAGEL, BLOOMBERG/ 731 LEXIN -- Wednesday, 1 November 2006, at 10:38 a.m.
        • Re: RE: HP-UX PA-RISC/Itanium
          AJAY GUPTA -- Wednesday, 1 November 2006, at 12:22 p.m.
          • Re: RE: HP-UX PA-RISC/Itanium
            Wiesiek Glod -- Wednesday, 1 November 2006, at 3:12 p.m.
  • RE: HP-UX PA-RISC/Itanium
    Alexey Sonkin -- Wednesday, 1 November 2006, at 1:01 p.m.
    • RE: HP-UX PA-RISC/Itanium
      Wiesiek Glod -- Wednesday, 1 November 2006, at 3:22 p.m.
      • RE: HP-UX PA-RISC/Itanium
        Alexey Sonkin -- Wednesday, 1 November 2006, at 4:18 p.m.
        • AW: HP-UX PA-RISC/Itanium
          Andreas.KUTSCHE@spar.at -- Thursday, 2 November 2006, at 6:11 a.m.
          • Re: AW: HP-UX PA-RISC/Itanium
            Wiesiek Glod -- Thursday, 2 November 2006, at 7:02 a.m.
      • AW: HP-UX PA-RISC/Itanium
        Model-Bosch, Tilman -- Thursday, 2 November 2006, at 4:53 a.m.
        • Re: AW: HP-UX PA-RISC/Itanium
          Wiesiek Glod -- Thursday, 2 November 2006, at 5:28 a.m.

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