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[Linux-cluster] What is the kernel recommendation for 32bit RHEL5 GFS cluster



We are moving from Development to Production. Can you please specify what are the recommended kernel versions to run on 32bit system with 32GB+ memory.

Would you recommend a PAE Kernel on GFS cluster?
Would you recommend 64bit over 32bit version, if so why?

Our Experience so far:
1) We have new HP Proliant 385 servers with 32bit RHEL5 where non PAE kernel sees all the memory (32GB).
2) In our test environment recent update to kernel 2.6.18-128.4.1.el5 we were unable to register all the memory and PAE kernel gave us problems when mounting GFS.

[root dev02 log]# dmidecode | grep -i "Range Size" ; uname -a; free -m
    Range Size: 12 GB
    Range Size: 3932161 kB
    Range Size: 3932161 kB
    Range Size: 4 GB
    Range Size: 4 GB
    Range Size: 4 GB
    Range Size: 4 GB
    Range Size: 1 kB
    Range Size: 1 kB
Linux dev02.foo.com 2.6.18-128.4.1.el5 #1 SMP Thu Jul 23 19:59:17 EDT 2009 i686 i686 i386 GNU/Linux
             total       used       free     shared    buffers     cached
Mem:          3674       3534        140          0        229       2818
-/+ buffers/cache:        486       3188
Swap:        12286          0      12285
[root dev02 log]#


--
Alan A.

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