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Just to follow up, I first did the procedure for removing a cache pool disk. Disconnected that disk and inserted the new larger disk. Then did the replace cache disk procedure, and disconnected the last of the old cachepool discs. Works like a charm.

Thanks! ...And of course. I ment set it up as a cache disk. It's not much data at the moment. Just a small VM and some docker/Appdata files. My main VM is going back on cache (ssd) when the new disk is up.

What if you want to swap out 2 old small ssd's with 1 new larger one? I'm swapping out 2x100GB now, and settled for 1x250GB. Can I just do the folloing: 1. power down 2. disconnect old drive nr.1 3. insert new drive 3. power up 4. set up new disk as cache only 5. power down 6. disconnect old disk nr.2 7. power up 8. done?

I've read something about disabling hyperthreading may solve some problems regarding latency. Is that done in BIOS? What performance gain/loss will that result in? Someone said 10% gain in using hyperthreading? Then I guess just 6 cpus will show up, instead of 12 in my system, and it makes pinning and assignment somewhat easier to manage.