swap / remove cache ssds in pool

[Bob@unraid]

Hello everyone,

 

at the moment I am running a single SSD cache pool with 3 drives. First I started with a single 500GB SSD, then I added a 1TB SSD and later another one.

 

Currently cache is the 500GB, cache1 is 1TB and cache2 is 1TB. All drives are part of a btrfs pool.

 

My goal is to remove the 500GB and just run the 2 1TB SSD in a 2-drive cache pool.

 

So I stopped the array, set the cache(0) drive to unassinged and started the array. That did not work and the cache pool showed "Unmountable: Too many missing/misplaced devices" error.

Next I set my newest 1TB SSD as the cache(0) drive and started again but the same error was shown.

 

Is there a "simple" way to remove the "old" 500GB SSD or is move all the stuff from the cache to the array the way to go, also with a cache pool?

 

Thanks!

 

 

[JorgeB]

44 minutes ago, Bob@unraid said:

So I stopped the array, set the cache(0) drive to unassinged and started the array.

That should work assuming it's a redundant pool, start the array with all pool devices assigned and post the diagnostics.

[Bob@unraid]

Thanks for the replay.

 

I set the (first) cache drive to "no" but then I cannot start the array (see my attachment)

 

Any ideas? I have no clue also thought a swap in the cache pool is quite easy

 

 

 

 

When I swap Cache and Cache 3 I can start the array but again with the unmountable error. Start the array anyway and run the diagnostics. Again see the attachments

 

Thanks a lot

unraid-diagnostics-20210508-1453.zip

Edited May 8, 2021 by Bob@unraid

[JorgeB]

21 hours ago, Bob@unraid said:

but then I cannot start the array

 

Just need to check that assuming the pool is redundant, can't see since diags were taken with the pool not mounted.

[Bob@unraid]

Thanks a lot Jorge.

Checked the mark and the array started without any problem. When I tried I think I just oversee that mark 😅

 

One last question: Is it possible to swap / set / change the 2 remaning disk to Cache and Cache 2 and get rid of "Cache "not installed""?

 

Thanks again

[JorgeB]

16 hours ago, Bob@unraid said:

One last question: Is it possible to swap / set / change the 2 remaning disk to Cache and Cache 2 and get rid of "Cache "not installed""?

Yes.

[Bob@unraid]

Just unassigned Cache 3 and added the drive to Cache, worked without any problems👍