I am thinking about speeding up a slow drive with ssd caches. I have two small ssds. I consider that I can accept read cache loss, but would love to configure writecache as raid-1. However, it seems that LVM cache advice always suggests the user opts for either LVM cache (ie. cominbed read&write) OR the writecache (write only), but not both.
Is combining both cache types indeed not possible? A simple explanation for why would be of great help.