I have a couple of intel 750 NVMe drives and 8 WD greens in RAID 6 - Caching possibilities?

<!-- SC_OFF --><div class="md"><p>So, just what the title says. I have 2 bitchin&#39; fast SSD&#39;s and a handful of dog-ass-slow spinning rust in software RAID 6.</p> <p>Which caching software do you think would handle this the best? </p> <p>-I&#39;m currently using LVM&#39;s built in option, but it doesn&#39;t seem to be doing much for me.</p> <p>-I&#39;ve tried EnhanceIO, but it seemed a little unstable at times and resulted in all-out kernel panics other times.</p> <p>-Should I even bother to try flashcache?</p> <p>-Should I slap myself for using such insanely slow spinners?</p> <p>P.S. I have too much data to move to temporary storage, a re-format is not possible right now.</p> </div><!-- SC_ON --> submitted by