Lost configuration!

[kennelm]

All,

 

I am helping a friend recover from a USB issue that resulted in a non-bootable unraid server.  I repaired the USB drive, but it looks like the unraid configuration file got deleted somehow.  Fortunately, I see that the Plus key is still intact.   Anyway, this much I know:

 

There was:

1 8TB parity drive

4 4Tb data drives

1 500GB M.2 cache drive

 

The server has 2 spare 4TB data drives.  I am not sure which two of the 6 4TB drives are the spares.  

 

I am not sure which data drive was disk1, disk2, etc.  But I am certain the 8TB drive was parity. 

 

I have another unraid server that I could use to evaluate the data drives to see if they are formatted or otherwise contain data.

 

What is the best way to recreate the lost configuration?  

 

Thanks!

[kennelm]

OK, I've determined which of the 4TB drives hold data.  I slid all six of the 4TB drives into my existing array (one by one) and I determined with 4 are xfs and which 2 are precleared/unformatted.

 

So, now I know exactly which drive is parity and which 4 drives are data drives.  I just don't know the order (disk1, disk2, etc.)

 

Any ideas on next steps?

 

Can I just assign the 4 data drives (in no particular order), the parity drive, and the cache drive and start the array?  I do NOT want the data drives to be formatted or otherwise changed.   If parity is no longer valid, I assume it will be recalculated.

[JorgeB]

With single parity data disk order is not important, just assign all disks, check parity is already valid ans start the array, then run a parity check, a few sync errors are expected because of you mounting the disks outside the array.

[kennelm]

With single parity data disk order is not important, just assign all disks, check parity is already valid ans start the array, then run a parity check, a few sync errors are expected because of you mounting the disks outside the array.

Thanks, Johnnie. I thought so, but wanted to be absolutely certain. The data drives have a ton of media that would be painful to recreate.

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[John_M]

9 hours ago, kennelm said:

The data drives have a ton of media that would be painful to recreate.

Painful enough to justify making backups?