troubleshooting Question

Redhat Linux RHEL 5.1 shows less RAM memory than physically present

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sunhux asked on
Unix OSLinuxLinux Distributions
16 Comments6 Solutions2095 ViewsLast Modified:

From /proc/meminfo  &  top & dmesg, our 32bit RHEL 5.1 (but 64-bit hardware)
showed only a total of 3GB RAM.

Physically 16GB RAM were inserted.

Is top/dmesg/meminfo giving the right info or how to get
RHEL 5.1 to fully utilize the 16GB or what's missing?

Is 32 or 64 bit RHEL 5.x better at utilizing memory?
The box hosts 7 Oracle instances

Is there a lot of effort involved to upgrade from 32 bit
to 64 bit RHEL 5.1?  Do I need to take a backup followed
by restore or just install the 64-bit RHEL 5.1 over it &
all the apps will still be intact?

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