Objective:

 

* Create pool with a 256 SSD and a 1 TB NVME

* Have both drives in single pool addressable by shares 

* No redundancy required

* Maximize space (e.g 1256 GB being the theoretical max ignoring FS and RAID implementations)

 

How do I achieve this?

 

I have tried and failed miserably once (thankfully had a backup of `/mnt/cache`).

When I added both to a pool the UI reported the same drive space as the 256GB SSD. Trying to go back to single device BTRFS I managed to break everything.

 

This BTRFS calculator indicates that the RAID 1 configuration means I cannot use ~744Gb of data.

 

Now I am back with two single device pools, but that is "meh" as a share can only be allocated to a single pool. 

 

I'd appreciate some guidance before proceeding and having to spend 2 hrs restoring my server

 

 

43 minutes ago, OliverRC said:

How do I achieve this?

Create a new pool and then convert to the single profile.

Okay that sounds good, now I am just a little hesitant after destroying my cache the first time.

 

Updated: Instructions to achieve this thanks to the help of @JorgeB

 

1. Stop Array

2. Change "Cache" / Pool name pool to 2 slots

3. Add drive to 2nd slot

4. Format 

5. Let BTFRS operation run to completion (RAID 1  - the default)

6. Click "Cache" / Pool Name under "Pool devices"

7. Under "Balance Status" click the dropdown "Perform full balance" and select "Convert to single mode"

8. Let balance complete 

9. Success, live long and prosper

Edited September 11, 20232 yr by OliverRC
Updated with more detailed instructions

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421

 

Thanks I have updated my reply with the steps required.

Appreciate the swift response. I will outline the steps to make is clear to the next person