Incorrect cache pool size

[kod23]

Hello everyone,

 

I'm new here and I hope I'm not in the wrong section. 

I've recently added a cache drive to my unraid server (6.7.2). The drive is a Samsung Pro 256GB SSD.

The problem is that it seems that unraid is not counting it.

I have 5 SSD in my cache pool and the size is the sum of half the size of each drive. 

3 x 120GB SSD 

1 x 250GB SSD 

1 x 256GB SSD

Total: 305GB ... where are those 128GB of the last drive gone?

 

Hope you can help me.

Thanks a lot

Andrea

 

Edited October 3, 2019 by kod23

[JonathanM]

BTRFS is "different" when it comes to pool sizes and calculating disk space. Try plugging your numbers into here and see what you get.

https://carfax.org.uk/btrfs-usage/

[kod23]

Hi,

 

thanks for your reply. Unfortunately as per this website, I should obtain a total amount of 433GB.

Am I missing a command to expand the cache pool?

 

[itimpi]

It looks rather as if the 5th drive is not being taken into account.   I am sure there is a BTRFS command that can ask for more information on how the drives are being used.

[kod23]

I've found that using btrfs command line, the disk is not really part of cache pool.

[kod23]

Does anybody know how to help me?

[JonathanM]

Have you done a balance?

[kod23]

I ended up creating a new cache pool.