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Forum Discussion
Recover files on RAID5 with Extundelete?
So I've done a lot of reading and know this is my fault! However I still think there is a chance I can recover some files, so just wanted to ask here as a last resort. I have a 4 disk (4TB x 4) s...
sg86 wrote:
Is it possible to do this via SSH, as obviously I'll need SSH access to run the btrfs restore utility.
What you need is access to the linux command line (CLI). It doesn't matter if you get that with SSH or telnet - it's the same CLI either way. The benefit of tech support mode is that it doesn't mount the data volume.
sg86 wrote:
I found a post about creating a ~/.tech-support file and rebooting, is that going to acheive the same purpose?
I haven't seen that post - maybe you could post a link to it? It's conceivable, but uncertain. So I'd suggest that using the boot menu.
BTW - can you confirm your model? Your initial post says RN212 - which definitely is wrong, because that only has two bays. My advice assumes that you have an OS-6 NAS (running 6.x firmware). But that was based on your model number - so we should sort that out before you go further.
It was this post, you replied in it: https://community.netgear.com/t5/ReadyNAS-Idea-Exchange/Reboot-into-tech-support-mode-from-GUI/idi-p/1411152
My Model is RN2120v2, and yes OS 6
I looked in the GUI but it says "secure mode" in settings not tech support, so how do i get into tech support?
Also how feasbile is BTRFS restore actually finding a recently deleted file, maybe my understanding of this utility is wrong and this is all a waste of time! It was a large (many GB), encrypted file with GPG key.
Thanks,
Shaun
sg86 wrote:
I looked in the GUI but it says "secure mode" in settings not tech support, so how do i get into tech support?
It's not done with the GUI, you need to use the boot menu. See pages 17-18 here: http://www.downloads.netgear.com/files/GDC/RN2120/ReadyNAS_OS6_Rackmount_HWM_EN.pdf
sg86 wrote:
Also how feasbile is BTRFS restore actually finding a recently deleted file, maybe my understanding of this utility is wrong and this is all a waste of time! It was a large (many GB), encrypted file with GPG key.
Honestly I don't know (it's not something I've needed to do). The GPG encryption won't matter to the NAS or the BTRFS file system.
For some reason it doesn't use my stastic IP setup, i found the same mac address assigned to a DCHP lease.
So I will play here for a little while with the btrfs utility and see what i can do, how do I safely exit this mode? I'm more worried about the RAID startup command you gave, do i need to reverse this?
sg86 wrote:
For some reason it doesn't use my stastic IP setup, i found the same mac address assigned to a DCHP lease.
Tech support mode isn't applying the network settings configured for the normal boot.
FWIW, I suggest that you reserve the IP address in your router instead of assigning a static IP in the ReadyNAS.
sg86 wrote:
I'm more worried about the RAID startup command you gave, do i need to reverse this?
No. Just shutdown down the NAS is enough.
Ok, for your information in case it's useful, this does work in recovering files
HOWEVER, I stupidly overwrote the same filename, and the tree doesn't seem to have any valid roots apart from the recent one. I had hoped to recover an older tree and therefore the older revision.
I'm using a script: https://gist.github.com/Changaco/45f8d171027ea2655d74
And it seems it only uses the recent tree.
This script you can specifc the root: https://github.com/danthem/undelete-btrfs but it doesn't seem to work, even without specifying it doesn't find anything. I think the regex generation is broken because I enter the path and it just says "Regex generated: '^/(|$' " wihch wouldn't be correct.
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