Zimbra

jpbuse · #1 (**permalink**) 04-30-2009, 06:09 PM

Anyone out there running ZCS (FOSS or NE) on top of CentOS 5.x with more than 4GBs of RAM installed and recognized by the OS?

rharms · #2 (**permalink**) 04-30-2009, 08:34 PM

Yes, NE on CentOS 5.2 x86_64. No problems.

jpbuse · #3 (**permalink**) 04-30-2009, 08:41 PM

Mine is 32bit. Maybe that is the issue. Are you running kernel or kernel-PAE?

bmw · #4 (**permalink**) 04-30-2009, 08:53 PM

Yep. Look to the right to see my configuration.

quanah · #5 (**permalink**) 05-03-2009, 10:06 PM

Yes, I use CentOS 5.2 (and recently upgraded it to 5.3) with 16GB of RAM, which it has always recognized.

*deepblue* · #6 (**permalink**) 05-04-2009, 01:23 AM

Quote:

Originally Posted by jpbuse

Mine is 32bit. Maybe that is the issue. Are you running kernel or kernel-PAE?

There is no PAE Kernel for x86_64. You should definitely use x86_64 if you can. PAE Kernels could extend the usable RAM on 32Bit Systems, but a single process can not use more that about 2GB of RAM...

Regards
Thomas

uxbod · #7 (**permalink**) 05-04-2009, 02:22 AM

If you did go the 32bit route then as DeepBlue has said the maximum addressable amount of memory per process will be 2048MB. JVM would need to be tuned back using

Code:

su - zimbra
zmlocalconfig mailboxd_java_heap_memory_percent
... and to set the parameter ...
zmlocalconfig -e mailboxd_java_heap_memory_percent=20

as described in Performance Tuning Guidelines for Large Deployments - Zimbra :: Wiki.

jpbuse · #8 (**permalink**) 05-04-2009, 07:06 AM

Quote:

Originally Posted by deepblue

There is no PAE Kernel for x86_64. You should definitely use x86_64 if you can. PAE Kernels could extend the usable RAM on 32Bit Systems, but a single process can not use more that about 2GB of RAM...

Regards
Thomas

Yes I am running 32bit at the moment on the machine. Plan to move it over to a 64bit setup here sometime soon. Thanks everyone for your comments and suggestions. Once I get ZCS moved over to the 64 machine I'll repost.