The most important part, which I missed at first because I rushed to the graphs: >> We started using SSDs as boot drives beginning in Q4 of 2018. Since that ti

The most important part, which I missed at first because I rushed to the graphs: >> We started using SSDs as boot drives beginning in Q4 of 2018. Since that time, all new storage servers and any with failed HDD boot drives have had SSDs installed. Boot drives in our environment do much more than boot the storage servers. Each day they also read, write, and delete log files and temporary files produced by the storage server itself IMO it's very light load which usually doesn't wear the drive much. [0] It would be more interesting if they provided wear (as reported by the drive) and TBW values. [0] Anecdata: a pair of Samsung 860 Pro 512Gb SSDs, apparently running LUKS, still had 45% endurance after 4 years (of unknown load though).