Re: [Lsf-pc] [LSF/MM TOPIC] Badblocks checking/representation in filesystems

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On Tue, Jan 17, 2017 at 03:37:03PM +0100, Jan Kara wrote:
> Well, the situation with NVM is more like with DRAM AFAIU. It is quite
> reliable but given the size the probability *some* cell has degraded is
> quite high. And similar to DRAM you'll get MCE (Machine Check Exception)
> when you try to read such cell. As Vishal wrote, the hardware does some
> background scrubbing and relocates stuff early if needed but nothing is 100%.

Based on publically available papers and little information leaks
there is no persistent NVM that comes even close to the error rate
for DRAM - they all appear to be magnitudes worse.

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