I am having a problem with a redhat 7.3 linux machine. Kernel version is kernel-smp-2.4.18-24.7.x. We run a third party financial application on the server. For some reason the server has been locking up with no response from the console. We've tried to diagnose the problem--from upgrading the kernel to switching between MPS modes.
MPS?
If you have a redundant server (and you should if this system is at all important), I'd put that one in service and run "memtest" on the system that's giving you grief. Hard lockups aren't always memory failures (memory failures often have other effects entirely), but it's a place to start. Let memtest run at least 4 full passes. I usually run it over night. If it finds errors, you have problems either in your RAM, motherboard, or CPU.
If it turns up nothing, you might want to attach a serial cable, and have the system send all kernel messages to /dev/ttyS<whatever>.
However, as of late I've seen the memory on this machine start out very low when it has been rebooted (naturally). Then over the span of about 24 hours, we're using 2.04 GB's of mem, with only about 16 MB's left, the real kicker is WE DON'T EVER USE ANY SWAP FOR SOME REASON.
That's perfectly normal. We discuss this over and over, and in fact when you posted this, we were discussing this issue on this very list:
https://listman.redhat.com/archives/redhat-list/2003-June/msg00572.html
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