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ML570G2 NMI error running VMWare, server ASRs

 

ML570G2 NMI error running VMWare, server ASRs

We have a ML570G2, 4 processor, 11GB RAM running VMWare ESX 2.1. Every day or so, the server hangs completely, no network, no console response and then the server ASRs. In the VMWare log, we get the following message: Nov 17 10:56:46 de3192vvev vmkernel: 0:00:01:02.536 cpu0:127) ALERT: APIC: 1150: Lint1 interrupt on pcpu 0 (port x61 contains 0xb1).
The VMWare web site says this is an NMI which suggests hardware to me. Anyone throw any light on what it is that is causing the problem, which area to look at? We have run diagnostics on the memory, three passes and no problems were found.