[gpfsug-discuss] Protection against silent data corruption

[Stephan Graf]

Hi,

I am wondering if there is an option in SS to enable some checking to 
detect silent data corruption.

Form GNR I know that there is End-to-End integrity. So a checksum is 
stored in addition.

The background is that we are facing an issue where in some files (which 
have data replication =  2) the mmrestripefile is reporting, that one 
block is mismatching it's copy (the storage cluster is running SS 
without GNR).
We have validated that the copied block is fine, but the original one is 
broken (and this is what is returned on read access).
SS right now in our installation is unable to determine which is the 
correct one.
Is there any option to enable this kind of feature in SS? If not, does 
it make sense to create an "IDEA" for it?

Stephan

-- 
Stephan Graf
Juelich Supercomputing Centre

Phone:  +49-2461-61-6578
Fax:    +49-2461-61-6656
E-mail: st.graf at fz-juelich.de
WWW:    http://www.fz-juelich.de/jsc/
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52425 Juelich
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