It would be interesting to know the pros and cons of this setup that you are suggesting vs zfs. +zfs detects and corrects bitrot ( http://www.zfsnas.com/2015/05/24/testing-bit-rot/ ) +zfs has working raid56 -modules out of kernel for license incompatibilities (a big minus)
BTRFS can detect bitrot but... are we sure it can fix it? (can't seem to find any conclusive doc about it right now) I'm one of those that is waiting for the write hole bug to be fixed in order to use raid5 on my home setup. It's a shame it's taking so long. Regards On Thu, Oct 17, 2019 at 12:21 AM Edmund Urbani <edmund.urb...@liland.com> wrote: > > Hello everyone, > > having recovered most of my data from my btrfs RAID-6, I have by now migrated > to > mdadm RAID (with btrfs on top). I am considering switching back to btrfs RAID > some day, when I feel more confident regarding its maturity. > > I put some thought into the pros and cons of this choice that I would like to > share: > > btrfs RAID-5/6: > > - RAID write hole issue still unsolved (assuming > https://btrfs.wiki.kernel.org/index.php/RAID56 is up-to-date) > + can detect and fix bit rot > + flexibility (resizing / reshaping) > - maturity ? (I had a hard time recovering my data after removal of a drive > that > had developed some bad blocks. That's not what I would expect from a RAID-6 > setup. To be fair I should point out that I was running kernel 4.14 at the > time > and did not do regular scrubbing.) > > btrfs on MD RAID 5/6: > > + options to mitigate RAID write hole > - bitrot can only be detected but not fixed > + mature and proven RAID implementation (based on personal experience of > replacing plenty of drives over the years without data loss) > > I would be interested in getting your feedback on this comparison. Do you > agree > with my observations? Did I miss anything you would consider important? > > Regards, > Edmund > > > > > > -- > *Liland IT GmbH* > > > Ferlach ● Wien ● München > Tel: +43 463 220111 > Tel: +49 89 > 458 15 940 > off...@liland.com > https://Liland.com <https://Liland.com> > > > > Copyright © 2019 Liland IT GmbH > > Diese Mail enthaelt vertrauliche und/oder > rechtlich geschuetzte Informationen. > Wenn Sie nicht der richtige Adressat > sind oder diese Email irrtuemlich erhalten haben, informieren Sie bitte > sofort den Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren > sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet. > > This > email may contain confidential and/or privileged information. > If you are > not the intended recipient (or have received this email in error) please > notify the sender immediately and destroy this email. Any unauthorised > copying, disclosure or distribution of the material in this email is > strictly forbidden. > -- --- Jon Ander Monleón Besteiro ---
