My current unraid server is pretty old now, however it still works fine - so have no reason to upgrade/replace the hardware.

 

However with SSD prices dropping, I recently bought 2x 4tb sata SSDs to replace two array drives (one parity and one data).  Having now set all of that up, i read that this is probably a bad idea and I shouldn't use SSDs within the array.

 

So the solution seems to be to use the SSDs in a btrfs pool outside of the array, as that would support trim.  However the version of unraid I am using (6.8.3) does not support multiple pools.

 

The reason I have never upgraded unraid is that some years ago when i tried upgrading to v6.9.x this broke passthru on my vm's.  No one on the forums was able to help me fix that at the time.   So I reverted back to a working 6.8.3.

 

I'm thinking that i should try upgrading again to the latest version and see where I stand.   However as I am so far behind, I'm concerned I won't be able to revert easily if things don't go as expected.

 

Can anyone advise if downgrading back to v6.8.3 from v6.12.x is possible?

I didn’t think the array supported SSDs at all. They always said SSDs don’t support TRIM but I just bought two that do.  Being able to transition from spinning runs to SSD would be amazing.

From what I've read, you can add SSDs to the array, however TRIM will never run.   Which is bad for SSDs

6 minutes ago, FlyingTexan said:

They always said SSDs don’t support TRIM but I just bought two that do.

SSD’s have always supported Trim and have relied on it to keep performance maximised. The issue has been that Unraid never does a Trim of SSDs that are used in the main array.   The rational for this was that this could lead to silent corruption of parity unless the SSD supports Deterministic Trim.