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Forum Discussion
Is it possible to mount a BTRFS partition on an external disk on the ReadyNAS?
Hi all, I am trying to get data from an old disk previously used in my ReadyNAS - I have an offsite copy of the data but given the current circumstances I can't easily get to it. Is it possible ...
Older thread, but the old Intel ss4200-e also used mdadm and a user recovered an entire raid by simply putting the drives in a system and booting up a ubuntu live cd--the entire volume was automatically there without any work. I can give you the exact version of the live cd and a link if you would like to give it a shot.
SamirD wrote:
Older thread, but the old Intel ss4200-e also used mdadm and a user recovered an entire raid by simply putting the drives in a system and booting up a ubuntu live cd--the entire volume was automatically there without any work. I can give you the exact version of the live cd and a link if you would like to give it a shot.
A live-cd is another option. But with the ReadyNAS, there generally are some commands needed to mount the array.
There were supposed to be some commands to mount the Intel's drives too, but those instructions are dated, and when someone just a year ago booted ubuntu because they had to recover their data since their power supply died, the raid was already assembled for him. :D It is probably the fastest data recovery I've ever seen from a 'dead' raid unit--took him only 15 minutes to get access to his data again. :)
Poking around in the ReadyNas OS4 dmesg, it is very similar to the Intel nas units I have so I have some confidence that mounting the raid might be just as easy. I hope it is because that will be really nice. :)
SamirD wrote:
Poking around in the ReadyNas OS4 dmesg, it is very similar to the Intel nas units I have so I have some confidence that mounting the raid might be just as easy. I hope it is because that will be really nice. :)
I think it would depend on whether btrfs and mdadm were installed on the live CD or not. It might also depend on whether the volume has multiple raid groups or not.
These commands will work on an ReadyNAS that has been booted into tech support mode.
# btrfs device scan # btrfs fi show # mount -o -ro /dev/md127 /data
Yep, and this is why I got the exact version of live cd that worked for the person that recovered their Intel nas. Dunno if it will work for the ReadyNas as I currently don't have a need (and I shouldn't if all the backups hold).
Good to know those commands. If an array doesn't automatically show up with a livecd with btrfs and mdadm support, those same commands should work too. Are these commands unique to OS4/6? Or will they work with both?
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