How to delete a "hidden" dataset.

[AVB]

I wanted to upgrade the space on a 8x3TB XFS2 pool but I didn't want to spend 4 hours each time to replace the discs one at a time. So I thought I could copy the dataset to a larger pool I have and then swap out all the discs and dump it back in. I used cp -iprv /mnt/RMS/Media/ /mnt/RMS-Backup/MediaB/ and watched the data scroll by. However when I looked at the RMS-Backup pool I could see that the freespace was decreasing but there was no MediaB dataset shown. I figured I'd delete the dataset and start again. but it isn't listed anywhere. It doesn't show under zfs list, or Pools in the Gui and if I try to create it I'm told it already exists. I thought that maybe I could unmount/mount it and then be able to delete it but again, if says it doesn't exist.

Somewhere there is a lump of about 100GB of data that I would like to get rid of but can't even see. Any ideas how to find and remove this missing dataset?

 

[Samuel Tai]

If you didn't create a MediaB dataset in RMS-Backup, then it's just a plain folder in the root dataset of that pool.