Hi: I was to use ssd to cache my mdadm-raid5 + lvm storage. but I wonder if I should use them as lvm-cache or mdadm write journal. lvm-cache has benefits that it can do also read-cache. but I wonder if full-stripe write is the key point I need. I prefer to use the ssd as mdadm write journal. is there other reason I should use lvm-cache instead of mdadm write-journal? ps: my ssd is intel dc grade, so I think enable write-back mode of cache is not problem.
