Hi Mark, AFAIK, there will not be any file system corruption if just data blocks are altered by activities outside GPFS. Mind: the metadata just tell were to find the data, not what will be there.
If you have the data replicated, you could compare the two replica. But mind: with some GPFS version, a replica compare tool was introduced which would fix differences by always assuming the first version it has read is the correct one -- which is wrong in half of the cases, I'd say. Only now (I think with SpSc 4.2), a version of that tool is available which allows the user to check the differences and possibly select the good version. If you have your data replicated and you may assume that the problem is affecting only disks in one failure group (FG), you could also set these disks down, add new disks to the FG and restripe the FS. Then, GNR works with end-to-end checksumming. This would not help you retrieving the original content but would allow you to identify altered file contents. Mit freundlichen Grüßen / Kind regards Dr. Uwe Falke IT Specialist High Performance Computing Services / Integrated Technology Services / Data Center Services ------------------------------------------------------------------------------------------------------------------------------------------- IBM Deutschland Rathausstr. 7 09111 Chemnitz Phone: +49 371 6978 2165 Mobile: +49 175 575 2877 E-Mail: [email protected] ------------------------------------------------------------------------------------------------------------------------------------------- IBM Deutschland Business & Technology Services GmbH / Geschäftsführung: Frank Hammer, Thorsten Moehring Sitz der Gesellschaft: Ehningen / Registergericht: Amtsgericht Stuttgart, HRB 17122 _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
