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Forum Discussion
How does bitrot protection actually work?
I understand the concept, but am curious how it is actually implemented on 6.2.0
To start with: bitrot protection (knowing it is a feature of btrfs) was one of my selection criteria for a ReadyNas 104.
I was quite disappointed as i recognized it wasn't supported with ReadyNas OS <6.2 as i started and i fiddled a bit on system level to check what i can do, and manually reballanced the btrfs filesystem behind the JBOD X-Raid mode of readynas to have BTRFS-RAID-1 that supports bit-rot-protection.
The Bit-Rot-Protection that is now available in Readynas OS6.2 is very weird and doesn't make sense to me: I currently have a JBOD volume over 2 3TB Drives.
The UI allows me to turn on Bit-Rot-Protection on share level. I can't understand how this could work at all - it can give me an message if a file is corrupted, but it can't protect me against it and rebuild mismatching blocks, as no redundancy is enabled at the moment.
I tryed to peek behind the User Interface to get a knowledge of what is going on... but really, i don't know exactly.
There is a interesting utility & daemon: mdcsrepair & mdcsrepaird. It seems to be tied into the linux md system somehow... The name could mean "md checksum repair".
This would be basically what bitrot protection stands for, but i don't understand how it can be enabled per subvolume of the btrfs filesystem, when the md volumes are beneath the btrfs filesystem.
Some clarification of the technical point of "bit-rot-protection" in ReadyNas would be greatly appreciated!
I was quite disappointed as i recognized it wasn't supported with ReadyNas OS <6.2 as i started and i fiddled a bit on system level to check what i can do, and manually reballanced the btrfs filesystem behind the JBOD X-Raid mode of readynas to have BTRFS-RAID-1 that supports bit-rot-protection.
The Bit-Rot-Protection that is now available in Readynas OS6.2 is very weird and doesn't make sense to me: I currently have a JBOD volume over 2 3TB Drives.
The UI allows me to turn on Bit-Rot-Protection on share level. I can't understand how this could work at all - it can give me an message if a file is corrupted, but it can't protect me against it and rebuild mismatching blocks, as no redundancy is enabled at the moment.
I tryed to peek behind the User Interface to get a knowledge of what is going on... but really, i don't know exactly.
There is a interesting utility & daemon: mdcsrepair & mdcsrepaird. It seems to be tied into the linux md system somehow... The name could mean "md checksum repair".
This would be basically what bitrot protection stands for, but i don't understand how it can be enabled per subvolume of the btrfs filesystem, when the md volumes are beneath the btrfs filesystem.
Some clarification of the technical point of "bit-rot-protection" in ReadyNas would be greatly appreciated!
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