@MainrtNr5 Welcome to the Rockstor community.
Re:
That is exactly correct, priority wise at least. Btrfs currently does a round robin on which drive to select given the pid of the process doing the access. But there is already the base capability to prioritise say faster drives over slower ones. But this capability is not yet fully developed. For a definitive state-of-play on this capability, which as come up a number of times before, see the linux-btrfs mailing list:
https://btrfs.wiki.kernel.org/index.php/Btrfs_mailing_list
A search within that lists archives should result in a few instances of proposals for fleshing out this capability. It would certainly be a nice feature but from what I can tell it’s just not fully developed yet. But is entirely possible given the base capabilities already in place and I think there have been a few proof-of-concepts proposed for this very feature.
As for searching our forum, we have a long standing css/theme issue that has obscured our almost invisible search (magnifying glass) icon in the top right:
It’s fairly faint but is located to the left of your user icon in the top right.
Sorry about this, @Flox I believe has a fix for this lined up ready but as always it’s a matter of priorities and we have quite a lot to juggle working on the next Stable release. But all in good time and thanks for the prompt. It is in hand but those hands are a little full currently.
Currently the only option we have, which has yet to be tested on our new Rockstor 4 variant, is an ‘external’ solution such as you referenced. And in our case the write-up we have is for bcache:
But this was written for our now legacy CentOS base, where as we are now ‘Built on openSUSE’ for our release candidate phase Rockstor 4.
Hope that helps.