I'll never forget to do a backup. Thanks for your help. Regards, Jorge Roy Sigurd Karlsbakk <roy@xxxxxxxxxxxxx> escreveu no dia terça, 5/04/2022 à(s) 12:30: > > That's probably a good idea. Hope you get most of it out of there. > > And find a way to backup when you're done ;) > > Vennlig hilsen > > roy > -- > Roy Sigurd Karlsbakk > (+47) 98013356 > http://blogg.karlsbakk.net/ > GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt > -- > Hið góða skaltu í stein höggva, hið illa í snjó rita. > > ----- Original Message ----- > > From: "Jorge Nunes" <jorgebnunes@xxxxxxxxx> > > To: "Roy Sigurd Karlsbakk" <roy@xxxxxxxxxxxxx> > > Cc: "Linux Raid" <linux-raid@xxxxxxxxxxxxxxx> > > Sent: Tuesday, 5 April, 2022 12:50:20 > > Subject: Re: RAID 1 to RAID 5 failure > > > Hi roy. > > > > Thank you for your time. > > > > Now, I'm doing a photorec on /dev/sda and /dev/sdd and I get better > > results on (some) of the data recovered if I do it on top of /dev/md0. > > I don't care anymore about recovering the filesystem, I just want to > > maximize the quality of data recovered with photorec. > > > > Best regards, > > Jorge > > > > Roy Sigurd Karlsbakk <roy@xxxxxxxxxxxxx> escreveu no dia terça, > > 5/04/2022 à(s) 10:17: > >> > >> I re-did these tests this morning, since I was unsure if I could have made some > >> mistake last night - I was tired. There results were about the same - complete > >> data loss. > >> > >> As for curiousity, I also tried to skip the expand phase after creating the > >> initial raid5 on top of the raid1. After creating it, I stopped it and > >> recreated the old raid1 with --assume-clean. This worked well - no errors from > >> mount or fsck. > >> > >> So I guess it was the mdadm --grow --raid-devices=4 that was the final nail in > >> the coffin. > >> > >> I just hope you find a way to backup your files next time. I'm quite sure we've > >> all been there - thought we were smart enough or something and the shit hit the > >> fan and no - we weren't. > >> > >> Vennlig hilsen > >> > >> roy > >> -- > >> Roy Sigurd Karlsbakk > >> (+47) 98013356 > >> http://blogg.karlsbakk.net/ > >> GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt > >> -- > >> Hið góða skaltu í stein höggva, hið illa í snjó rita. > >> > >> ----- Original Message ----- > >> > From: "Roy Sigurd Karlsbakk" <roy@xxxxxxxxxxxxx> > >> > To: "Jorge Nunes" <jorgebnunes@xxxxxxxxx> > >> > Cc: "Linux Raid" <linux-raid@xxxxxxxxxxxxxxx> > >> > Sent: Tuesday, 5 April, 2022 02:29:03 > >> > Subject: Re: RAID 1 to RAID 5 failure > >> > >> >> Didn't do a backup :-( > >> > > >> > First mistake… *Always* keep a backup (or three) > >> > > >> >> > >> >> Unmount everything: > >> > > >> > No need - what you should have done, was just to grow the array by > >> > > >> > Partition the new drives exactly like the old ones > >> > mdadm --add /dev/md0 /dev/sd[cd]1 # note that sd[cd] means sdc and sdd, but can > >> > be written this way on the commandline > >> > mdadm --grow --level=5 --raid-devices=4 > >> > > >> > This would have grown and converted the array to raid5 without any data loss. > >> > > >> >> $ sudo mdadm --create /dev/md0 -a yes -l 5 -n 2 /dev/sda /dev/sdd > >> > > >> > As earlier mentioned, this is to create a new array, not a conversion. > >> > > >> >> So, my question is: Is there a chance to redo the array correctly > >> >> without losing the information inside? Is it possible to recover the > >> >> 'lost' partition that existed on RAID 1 to be able to do a convenient > >> >> backup? Or the only chance is to have a correct disk alignment inside > >> >> the array to be able to use photorec to recover the files correctly? > >> > > >> > As mentioned, it doesn't look promising, but there are a few things that can be > >> > tried. > >> > > >> > Your data may still reside on the sda1 and sdd1, but since it was converted to > >> > RAID-5, the data would have been distributed among the two drives and not being > >> > the same on both. Further growing the raid, would move the data around to the > >> > other disks. I did a small test here on some vdisks to see if this could be > >> > reversed somehow and see if I could find the original filesystem. I could - but > >> > it was terribly corrupted, so not a single file remained. > >> > > >> > If this was valuable data, there might be a way to rescue them, but I fear a lot > >> > is overwritten already. Others in here (or other places) may know more about > >> > how to fix this, though. If you find out how, please tell. It'd be interesting > >> > to learn :) > >> > > >> > PS: I have my personal notebook for technical stuff at > >> > https://wiki.karlsbakk.net/index.php/Roy's_notes in case you might find that > >> > interesting. There's quite a bit about storage there. Simply growing a raid is > >> > apparently forgotten, since I thought that was too simple. I'll add it. > >> > > >> > So hope you didn't lose too much valuable data > >> > > >> > Vennlig hilsen / Best regards > >> > > >> > roy > >> > -- > >> > Roy Sigurd Karlsbakk > >> > (+47) 98013356 > >> > -- > >> > I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er > >> > et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av > >> > idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og > > > > relevante synonymer på norsk.
