Reassembling RAID from Seagate NAS - multiple newbie mistakes
 

Hello everyone,

I have a Seagate Business NAS that failed, like they do. It ran default configuration, 4×4TB drives in RAID5 array. Because the box died, after trying everything I could find, I decided to follow this guide (https://sidfishes.wordpress.com/2014...-failed-error/) and after some more googling I was able to recreate the array in newly built Debian machine.

Now the main problem was that most of the data I needed was in 2TB iSCSI file. Because I didn´t know the state of drives (SMART said three are okay and one with warning), I tried to recover the array with brand new 4TB WD drive replacing the one with SMART warning and then decided what to do next.

It all went well until we had a series of multi-hour power outages that the UPS just couldn´t handle. And there we are, my inadequate Linux knowledge trying to repair something I didn´t understand.

As I know now, the biggest mistake was to try to recreate the RAID instead of reassembly, but it happened. Now I do have six drives connected:

1) spare 4TB WD with partial recovery and blank 2TB WD to copy the data
2) 2 Seagate drives that holds the recovered RAID5 (which cannot start with 2 drives only, of course)
2) 2 Seagate drives with new array created with this:
One of these two drives is the one with the warning.

Now what?

Is there anything I can do to reassemble the original array and copy the iSCSI LUN file so I can mount it? I have kept some notes during the process, but I don´t know if they would be of some help.

Lastly, as I have read hundreds of pages during last two weeks, I really can´t sort it out by myself due to big internal confusion.

The files on this array are not critical, I can get by without them, but I can make some people quite happy if it works out.

If you think that all is not lost, please help, I promise I´ll try to understand! :)

Thanks, Tom

You might be interested to read this thread. Note the recent update.