>> [...] ps: my ssd is intel dc grade, so I think enable >> write-back mode of cache is not problem. [...] Not all "enterprise" grade flash SSD models have persistent buffers though, so better check. > In any case, in order to not add a single point of failure to > the array, better rely not on SSD being a "datacenter" one > (anything can fail), but use a RAID1 of two SSDs. The main point of "enterprise" flash SSD models is (as the original poster wrote) the ability to enable write-back (thus much, much higher committed write rates), if they have persistent buffering. Higher "endurance" and reliability are secondary points. With redundant units having models with persistent buffering is even more important too.
