January 2, 201610 yr Hello, long story short: I played with another os on my unraid machine and I unintentionally formatted one of my data drives. To make it more complicated, I even formatted my flash drive as I wanted to update to v6 anyway. So this is what I had: Unraid 4.something free version, with two data drives and one parity drive Now I have: Currently no Unraid installation, the three physical drives consisting of one data driive, one formatted data and the parity drive. So I guess, I should start over and get a Unraid 6 license, right? And then? What are the steps that I should take? Sorry, for being so unexperienced, Unraid just worked for years now. This is the first time that I have trouble. And it's even my fault. Thanks in advance!
January 2, 201610 yr Community Expert Do you have a record/copy of your .key file that contained the license you used with 4.7? The same key file with work with unRAID v6.
January 2, 201610 yr Take the drive out and put it somewhere very safe whilst you're waiting for experienced advice. Don't try anything without checking here first.
January 2, 201610 yr Community Expert Take the drive out and put it somewhere very safe whilst you're waiting for experienced advice. Don't try anything without checking here first. Good point. As it an old version of unRAID it will have definitely been formatted with reiserfs. In that case it is likely that the majority of the data on the disk can be recovered using the reiserfsck tool.
January 3, 201610 yr Community Expert If you know which drive is parity, and you must be sure or you could lose more data, it’s easy to recover using a spare drive: -create flash of v6.1.6 (don't use any v6 release below v6.1.5 because trust parity won't work as it should) -assign old parity, good data disk and a new spare drive to recover formatted disk, check trust parity before starting array -start array -only one data disk should be unmountable, if there are two you're using wrong data disk or there's something else wrong -stop array -unassign spare disk (the unmountable one) -start array -stop array -reassign spare disk -start array and wait for disk to finish rebuild I’m sure this will work as I did it myself before, but I recommend using a spare disk just in case the rebuild fails because of a bad disk or some other reason so you can still try to recover data using reiserfsk on the formatted disk.
January 3, 201610 yr If you know which drive is parity, and you must be sure or you could lose more data, it’s easy to recover using a spare drive: -create flash of v6.1.6 (don't use any v6 release below v6.1.5 because trust parity won't work as it should) -assign old parity, good data disk and a new spare drive to recover formatted disk, check trust parity before starting array -start array -only one data disk should be unmountable, if there are two you're using wrong data disk or there's something else wrong -stop array -unassign spare disk (the unmountable one) -start array -stop array -reassign spare disk -start array and wait for disk to finish rebuild I’m sure this will work as I did it myself before, but I recommend using a spare disk just in case the rebuild fails because of a bad disk or some other reason so you can still try to recover data using reiserfsk on the formatted disk. I would insert a first step which is assign all the drives as data drives including the parity drive and excluding the drive you want to recover. Then the one that shows as unformatted is the parity drive..
January 3, 201610 yr Community Expert I would insert a first step which is assign all the drives as data drives including the parity drive and excluding the drive you want to recover. Then the one that shows as unformatted is the parity drive.. The problem is that he formatted one of the data disks, so his going to have two unformatted disks, that’s why this only works if he knows which one was parity.
January 3, 201610 yr That's why I suggested leaving the wiped drive out and excluding it for that step...
January 3, 201610 yr Community Expert Good point, as long as he knows which one it is. And if he does know the identitiy of all drives he can just rebuild the wiped drive from parity using the wiped drive instead of a spare disk, assuming unRAID V6.1.5 or greater where trust parity works correctly. New Config and Trust Parity with all drives in correct slots then Start, Stop, unassign wiped drive, Start, Stop, reassign wiped drive, Start and it should rebuild.
January 4, 201610 yr Author Wow, thanks a lot for all your answers! No I have hope again! I installed Unraid 6.1.6, requested a trial license and assigned my three drives. But now I cannot start my array because Too many attached devices. Please consider upgrading your registration key. Huh? These are exactly the same drives that I used before with the Unraid free version. I already rebooted the system after requesting the trial license.
January 4, 201610 yr Community Expert Wow, thanks a lot for all your answers! No I have hope again! I installed Unraid 6.1.6, requested a trial license and assigned my three drives. But now I cannot start my array because Too many attached devices. Please consider upgrading your registration key. Huh? These are exactly the same drives that I used before with the Unraid free version. I already rebooted the system after requesting the trial license. Do you have any other drives plugged in? They count against the license even if not being used by unRAID.
January 4, 201610 yr Author Ok, I see... Thanks. In the past I had Unraid running as a VM under Esxi, so only the three drives were seen by unraid.
January 4, 201610 yr Author I have everything back again, thanks a lot! I decided to trust Unraid some years ago, I am really glad that I was right!
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