On Sun, 2 Oct 2016 13:29:56 -0600 Chris Murphy <li...@colorremedies.com> wrote:
> Well short of a bug, the problem aren't the checksums. The problem is > the metadata is wrong, so if you recalculate checksums you're likely > end up with an even more corrupted file system because it'll start out > trusting bad metadata. It appears that metadata got created with profile "single", because the device is SSD. If this was DUP metadata, this entire problem wouldn't happen. It is a terrible idea to downgrade metadata to single on detecting SSDs at mkfs. The original rationale was that "SSDs will deduplicate it anyways", but there are many ways things can corrupt way before reaching the SSD (from the point of view of which it will look like the computer sent two different metadata blocks, if one got corrupted in flight), and secondly, the ability of SSDs to perfectly deduplicate small 4K sized pieces of data at hundreds of megabytes in read/write speeds is VASTLY overestimated here. -- With respect, Roman
pgpPEC1J40RIX.pgp
Description: OpenPGP digital signature
