BL/DL CPU Redundancy

[Rob Rugg]

In a BL/DL server with more than 1 cpu will the server remain running or does the whole system fail?

[Diego Salim de Oliveira]

Rob, the question should be how the SO will react before a CPU failure.

HP-UX (HP9000 / HP Integrity), if a CPU fail, the system continues online, except if the CPU 0 (where Kernel resides fails, what will cause a system reboot).

For the hardware point of view, in a ProLiant is the same thing, the Hardware still function.
The problem is the SO.

I'm not a Linux or Windows expert, but, every time that I consulted documentation about Windows Server and Linux, no one supported CPU dynamic deallocation. I supose that even the latest versions don't support.

[Blazhev_1]

Rob

by the memory you can configure Advanced memory protection(spare, raid) by some server models and memory will not be a single point of failure.
However never heard of CPU redundancy -if even one of the CPUs fails there will be black screen and internal health LED will be red(or bluescreens e.g. 0x9C or 0x50 if it's not completely dead)

Regards

[Rob Rugg]

Thanks to both of you for the information

[David Claypool]

Operating Systems like Windows, Linux and ESX can't cope with a processor failure; the OS will go down. ProLiant servers have a feature called Automatic Server Recovery-2 (ASR-2) that will detect that, flag the processor failed, and then reboot the OS without the failed processor. Doesn't prevent an outage, but maximizes uptime by recovering automatically.