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тАО04-06-2006 03:00 AM
тАО04-06-2006 03:00 AM
RP8240 2 Cell setup as 1 partition - SPOFs
We have been asked to identify single points of failure on the system.
It is attached to an EVA4000 - but we have that one covered (securepath, dual controllers, redundant paths etc).
It is also connected to a UPS - although there is only 1 of them... so 1 SPOF IDed here already.
Question is, that if a processor/memory module was to fail on one of the cells, would the system continue to run (without a reboot / re-partitioning of cells)...
We know the cells are connected to one system backplane - so potentially a SPOF here...
Rgds
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тАО04-06-2006 07:04 AM
тАО04-06-2006 07:04 AM
Re: RP8240 2 Cell setup as 1 partition - SPOFs
Thats why there is the service guard product for clustering applications.
see also
http://docs.hp.com/en/ha.html#Serviceguard
http://h71028.www7.hp.com/enterprise/cache/4174-0-0-0-121.html
Hope this helps!
Regards
Torsten.
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тАО04-06-2006 09:23 PM
тАО04-06-2006 09:23 PM
Re: RP8240 2 Cell setup as 1 partition - SPOFs
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тАО04-07-2006 01:29 AM
тАО04-07-2006 01:29 AM
Re: RP8240 2 Cell setup as 1 partition - SPOFs
Same with the processor, most processor failures are not the processor itself, but the cache on the die. When you have a multi-bit fault in the cache, whatever data or instructions are stored there become corrupted, and the system cannot continue.
In both these cases the system does detect when this occurs, and issues a reset to protect your data from corruption.
Fortunately, these conditions are *extremely* rare on this system, and typically, the system will detect the first bit failure and deallocate that block of memory. This is what the Page Deallocation Table was designed to do. Also, when a single-bit error is detected in the Cache on a processor, the system will attempt to deactivate the processor and continue. If the processor cannot be deactivated, the system will continue to send alerts until the processor is replaced.
Josh
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тАО04-07-2006 03:36 AM
тАО04-07-2006 03:36 AM
Re: RP8240 2 Cell setup as 1 partition - SPOFs
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тАО04-07-2006 03:43 AM
тАО04-07-2006 03:43 AM
Re: RP8240 2 Cell setup as 1 partition - SPOFs
damaged memory board slot
Voltage regulator module (VRM) failure
damaged cpu slot
damaged connectors
If you are not making any changes, the only failures I've seen are the VRMs. VRMs are redundant, so if one fails, the cell can continue to operate, but if a failure is detected on boot, then the cell will halt.
Josh
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тАО04-07-2006 08:06 AM
тАО04-07-2006 08:06 AM
Re: RP8240 2 Cell setup as 1 partition - SPOFs
Rgds,
Jeff