On Wed, Jul 01, 2020 at 03:53:40PM -0400, Josef Bacik wrote: > On 7/1/20 3:43 PM, waxhead wrote: > > Josef Bacik wrote: > > Just an idea inspired from RAID1c3 and RAID1c3, how about introducing DUP2 > > and/or even DUP3 making multiple copies of the metadata to increase the chance > > to recover metadata on even a single storage device? > > Because this only works on HDD. On SSD's concurrent writes will often be > shunted to the same erase block, and if the whole erase block goes, so do all of > your copies. This is why we default to 'single' for SSD's. > > The one thing I _do_ want to do is make better use of the backup roots. Oh please do, otherwise the backup roots are on the track to be removed due to very little chances to actually make things better. We've heared complaints about that for long.
