Hey, I've seen similar issues to my situation searching through the forums, and am currently still working on it but I wanted to post this. I'd like to think that this is a common issue for noobs like me to Unraid, or just making a silly mistake also like me. If I figure it out on my own of course I'll respond in case anyone runs into this. I started a RAID/cache pool with two old SSD's I had but both were different sizes. I did this prematurely without looking into this so that's my fault... Anyway, I tried to take them out of the pool, but now the larger drive that is 240gb is reading as 64gb. I tried changing the file type from btrfs to xfs, but when I try to format the drive Unraid just tells me that the drive is unmountable. If I switch it back to btrfs it's back to 64gb. The other drive is still showing it's in a pool. I've scrubbed them, reset them, erase, etc... but I'm still stuck. Any suggestions would be appreciated? 

Edited December 27, 20223 yr by MedicalDetective05
solved

Unassign the drives, install the Unassigned Devices and Unassigned Devices Plus plugins, enable destructive mode in settings. You'll now get a red cross at the right of the drive names, click on that to erase all partitions on the disks you want to clear. They'll now be blank and ready for setting up however you want.

Edited December 24, 20223 yr by Kilrah

if you use 2 ssds for a cache pool, unraid assumes that you want to create a RAID 1 (Mirror) pool for securing the Data. Such a mirror alway has the size of the SMALEST Disk from the pool, the leftover bytes of the other one are unused.

If you go to the pool's setting, you can control what kind of RAID Level (if any) should be created. Of course the best time for this would be BEFORE you put any data on the pool. Changes of RAID Level usually imply a reformat thus killing everything which is on there now (hint: move/copy it elsewhere before you start to play with the pools geometry...)

(if you use 3 and more drives unraid will automatically choose RAID Level 5 for instance. But as with every RAID level, the restriction always is that the capacity is the one from the smalest drive)

to "free" the unused part of a "out-of-pool-taken" drive you need to install "unassigned devices" plugin and delete all existing partitions of that drive.

Edited December 24, 20223 yr by MAM59

1 hour ago, Kilrah said:

Unassign the drives, install the Unassigned Devices and Unassigned Devices Plus plugins, enable destructive mode in settings. You'll now get a red cross at the right of the drive names, click on that to erase all partitions on the disks you want to clear. They'll now be blank and ready for setting up however you want.

 

Thank you, I'm actually going to bed now, and I'm moving files to the server so I'll do this as soon as I can. I have both plugins already enabled I just never implemented destructive mode so I didn't even think of that, thank you. 

 

 

57 minutes ago, MAM59 said:

if you use 2 ssds for a cache pool, unraid assumes that you want to create a RAID 1 (Mirror) pool for securing the Data. Such a mirror alway has the size of the SMALEST Disk from the pool, the leftover bytes of the other one are unused.

If you go to the pool's setting, you can control what kind of RAID Level (if any) should be created. Of course the best time for this would be BEFORE you put any data on the pool. Changes of RAID Level usually imply a reformat thus killing everything which is on there now (hint: move/copy it elsewhere before you start to play with the pools geometry...)

(if you use 3 and more drives unraid will automatically choose RAID Level 5 for instance. But as with every RAID level, the restriction always is that the capacity is the one from the smalest drive)

to "free" the unused part of a "out-of-pool-taken" drive you need to install "unassigned devices" plugin and delete all existing partitions of that drive.

 

Yeah, I feel silly for doing what I did I had already watched a video before setting up my server about how it puts everything in RAID. I wasn't thinking at the time.... I just thought two in a pool = more space... I got a little over zealous I suppose, and I will reply back after I try do this. Thank you for the explanation it was helpful and reminded me of that video I watched by spaceinvaderone. 

Just wanted to say thank you again it's working now all good!