Re: use ssd as write-journal or lvm-cache?

On 17/02/2021 09:12, Peter Grandi wrote:

quoted

I was to use ssd to cache my mdadm-raid5 + lvm storage.

Not that sure that layering MDADM on top of DM/LVM2 is always a
good idea, I tend to prefer to keep things simple.

Is that what the OP is doing? I don't think putting raid on top of lvm 
is a good idea, which is why I'm putting lvm on top of raid.

Whatever, I guess you're better putting the cache on the bottom layer, 
just above the actual hardware. In my case, that would be caching the raid.

Cheers,
Wol