On Fri, 11 Apr 2014 17:41:12 +0530 "Manibalan P" <pmanibalan@xxxxxxxxxxxxxx> wrote: > Hi Neil, > > Also, I found the data corruption issue on RHEL 6.5. > > For your kind attention, I up-ported the md code [raid5.c + raid5.h] > from FC11 kernel to CentOS 6.4, and there is no mis-compare with the > up-ported code. This narrows it down to between 2.6.29 and 2.6.32 - is that correct? So it is probably the change to RAID6 to support async parity calculations. Looking at the code always makes my head spin. Dan : have you any ideas? It seems that writing to a double-degraded RAID6 while it is recovering to a space can trigger data corruption. 2.6.29 works 2.6.32 doesn't 3.8.0 still doesn't. I suspect async parity calculations. NeilBrown
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