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

Alan A alan.zg at gmail.com
Mon Aug 17 21:38:10 UTC 2009

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

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 at 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 at dev02 log]#

Alan A.
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