Hi,
After doing a search of the FAQ and the forum, I have some questions about swapping out cache drives.
I am currently running unRAID 6.2 stable release.
My BTRFS cachce currently consists of the following SSDs:
1. 256GB (originally started with just one)
2. 256GB (added it to have redundancy)
3. 512GB (added it later, figuring to double the size of usable space to 512GB)
The webGUI always reports having only 256GB available and shows only the two 256GB with used space; the 512GB appears to be have no read/writes to it.
I want to swap out the two 256GB SSDs with a single 512GB SSDs, resulting in two 512GB SSDs.
Here's my questions:
1. Would the fastest way to do this be to backup everything on the cache drives to a non-cache drive; remove all the drives from the cache pool; physically swap out the two 256GB for the second 512GB drive; re-create the cache pool; and copy the data back to the new cache pool?
2. Do I need to somehow clear out/reformat the old 512GB drive before re-creating the cache pool? I've seen references about using preclear on a drive before using it for cache to make sure it is empty; but, also have read other messages saying preclear is for hard drives only.
3. I've read that having a cache pool using different size drives could result in incorrect cache pool space being reported in the webGUI. If I was to add a third drive of equal size (e.g., a 3rd 512GB drive), will this result in 750GB usable?
Thanks,
Marcos