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#1 (**permalink**) 04-20-2008, 07:40 AM

Unfortunately I don't have the equipment to test this on which would be
fairly trivial so I am asking this here.

We have a customer who has two 64 bit AIX systems running a 32 bit
kernel and a 32 bit version of IDS. The two servers are replicated via
HDR. They also have two older systems running AIX which are backups
servers and also serve as a test suite. These are only 32 bit capable.
The data is transferred from the main system to the backup system using
an ontape archive. At the moment everthing runs the same version of IDS
so all is OK.

Am I going to have problems with the ontape transfer if the main system
runs IDS 9.40.FC5 and the the standby server runs 9.40.UC5? My hunch is
that this isn't going to work.

On a related note, and sorry if this is a "how long is a piece of
string" type question, what sort of performance improvement can I expect
by moving to a 64 bit kernel running a 64 bit version of IDS over 32 bit
versions on the same hardware?

Ben.

#2 (**permalink**) 04-20-2008, 07:41 AM

Ben Thompson wrote:
> Unfortunately I don't have the equipment to test this on which would be
> fairly trivial so I am asking this here.
>
> We have a customer who has two 64 bit AIX systems running a 32 bit
> kernel and a 32 bit version of IDS. The two servers are replicated via
> HDR. They also have two older systems running AIX which are backups
> servers and also serve as a test suite. These are only 32 bit capable.
> The data is transferred from the main system to the backup system using
> an ontape archive. At the moment everthing runs the same version of IDS
> so all is OK.
>
> Am I going to have problems with the ontape transfer if the main system
> runs IDS 9.40.FC5 and the the standby server runs 9.40.UC5? My hunch is
> that this isn't going to work.
>
Yes, you're correct. Indexes are different, so it won't work.

One possible solution would be to use ER between the 64 bit and the 32
bit systems. IDS 9.40 allows both HDR and ER at the same time.

> On a related note, and sorry if this is a "how long is a piece of
> string" type question, what sort of performance improvement can I expect
> by moving to a 64 bit kernel running a 64 bit version of IDS over 32 bit
> versions on the same hardware?

If you have memory on the machines that you cannot allocate with 32 bit
systems, then you can get better performance with 64 bit version,
because you can setup much larger buffers.

>
> Ben.

#3 (**permalink**) 04-20-2008, 07:41 AM

Claus Samuelsen wrote:
> Ben Thompson wrote:
>
>> On a related note, and sorry if this is a "how long is a piece of
>> string" type question, what sort of performance improvement can I
>> expect by moving to a 64 bit kernel running a 64 bit version of IDS
>> over 32 bit versions on the same hardware?
>
>
> If you have memory on the machines that you cannot allocate with 32
> bit systems, then you can get better performance with 64 bit version,
> because you can setup much larger buffers.

We don't have a problem with not being able to allocate sufficient
BUFFERS. Does this mean that for us there are no benefits?

Ben.

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Restoring ontape archives between 32 bit and 64 bit versions of Informix