On 17/12/19 16:54, Patrick Pearcy wrote: > Hi everyone, I am hoping that someone is able to assist me with > recreating my 'failed' WD My Cloud PR4100 RAID. I experienced a > series of short power interruptions and despite having a UPS and dual > power sources for my WD MyCloud, it reported that I had: (a) failed > drive 1, (b) installed a new drive 1, (c) failed drive 2 and (d) > installed a new drive 2. ALL without my touching the system. I have > a little knowledge of Linux (enough to follow instructions) so I was > able to run SMARTCTL on all 4 drives (no errors) and MDADM examine > (see below). When trying to force an assemble, I receive the error > that no superblock was found on sda or sdb. WD support referred me to > a data recovery service that wants me to send all disks to them. I > believe the data is still present, I just don't know how to get the > array back. Any assistance or suggestions would be greatly > appreciated. Thanks! Patrick > > mdadm - v2.6.7.1 - 15th October 2008 Ouch! That is an OLD version of mdadm. Is that the version that comes with the WD? The drives themselves. Are they 2GB drives? That's tiny by today's standards. I'd get a big 500GB or 1TB drive and image them on to the new drive. That way you have a backup, and you can play. Can you run a modern version of mdadm over the drives? It's now up to 4.0. And you say you can follow instructions. Did you find the linux raid wiki? I guess not since it asks for rather more information, including things like mdadm --detail, and lsdrv. https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn https://raid.wiki.kernel.org/index.php/Asking_for_help If it has lost the superblock, I'm guessing an mdadm --create will fix it BUT DO NOT EVEN *T*H*I*N*K* of running that over the original drives - if you back them up on to a big drive you can run it on the backups. I'm optimistic you can get your data back. But you might need some help from the experts. And try and put those backups I mentioned on a snapshot-based filesystem like lvm or btrfs, so you can snapshot it, try various rescue tactics, and revert to the snapshot if they don't work. Cheers, Wol
