Cloverleaf 5.8 on RedHat 64bit

[Elisha Gould]

We currently have approximatly 90 sites with 600 threads on our production server which is running AIX 5.3 currently. We are currently maxing out this server and it is time for a new one.

The consideration at present is to move to some intel RedHat servers, although the release notes indicate that 64 bit RedHat is not supported.

We need more than the 3.5 GB RAM that the 32 bit OS will provide (looking closer to 12-16 GB RAM)

Is anyone using 64bit RedHat for their production environment?

have you come into any issues with crashes, etc?

Is there any issues with io performance that you have needed to deal with?

Another option for us is to spread the load across several servers, but that adds complexity in terms of failover and load ballancing.

Upgrading to a new AIX server may be an issue due to time constraints and funding.

Topic

[Max Drown (Infor)]

Elisha, I believe that you can install 5.8 on RedHat 64-bit. I am confirming that now, and will get back to you asap.

-- Max Drown (Infor)

[Mike Shoemaker]

Hi. I’m running HA Cloverleaf 5.8 on RHEL 6.2 64bit without any problems so far.  I’m not in production but I am mirroring my production environment for testing purposes and so far it runs like a dream.

[Max Drown (Infor)]

I have confirmed that Cloverleaf will run on RedHat 64-bit provided that the 32-bit libraries are installed. Cloverleaf will run as a 32-bit application on a 64-bit OS.

-- Max Drown (Infor)

[Max Drown (Infor)]

Here is some more information.

CL is still a 32-bit app and process size is limited by 32-bit address space. You can have multiple processes that can consume the increased amount of RAM, but each individual engine process can only address a certain amount of RAM before it runs out of memory. The actual amount is platform dependent.

(from Rob)

-- Max Drown (Infor)

[Elisha Gould]

Thanks Max, Mike

Is Cloverleaf supported when running RHEL 6.2 64bit?

Management are concerned based on the release notes, that we may run into support issues if we swap over.

We have actually just set up a test 64bit RHEL 5.7 virtual machine which is running cloverleaf fine from initial testing. I’m just concerned about any issues that we may have during the migration.

[Mike Shoemaker]

I was supported with an issue related to a security limit at the OS level for the max number of processes allowed to run.  Redhat version was not an issue, although I found the solution to the problem via Google before Support did 😉   I was assured at install that the OS version would not be a problem with regard to Support.

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