Oh, I mentioned that TLC SSDs supposedly were thought to only last for 1000 erase cycles, but the particular Samsung model I was referring to (840 non-Pro) seems to do a lot better! These people killed one after 24,000 erase cycles and 3 petabytes of writes: http://www.vojcik.net/samsung-ssd-840-endurance-destruct-test/ If we use 24000 as the cycle count, then with just 13 on the clock so far, machine #2 is going to last 386217 years before wearing out :)
Machine #1 is using MLC so maybe it'll get to 500 years? :) On 16 January 2015 at 14:22, Toby Corkindale <[email protected]> wrote: > I'm curious to know what your SSD wear indicators look like, from > long-running Linux machines, and how long it looks like they'll last > based on existing usage. > You can query these with smartctl (if your drive db is too old, run > sudo update-smart-drivedb first) > > I'll go first. These are just private machines, albeit ones doing > reasonable work. Perhaps at some point in the future I'll be able to > report on long-term results of enterprise SSDs, but I can't right now. > > Machine one: > Power_On_Hours 4522 (188 days) > Total_NAND_Writes_GiB 18846 > Maximum_Erase_Cycle 199 > Avg_Write_Erase_Ct 74 > Total_Bad_Block 201 > Perc_Avail_Resrvd_Space 100 > This machine has been running for over 188 days non-stop, has logged > nearly 19 TB of writes, and is about 2.5% of the way through it's > expected minimum lifespan[1]. > Estimated total lifespan time: 20.6 years. > > Machine two: > Power_On_Hours 18326 (763 days) > Used_Rsvd_Blk_Cnt_Tot 0 > Wear_Leveling_Count 13 > Total_LBAs_Written 2066747494 (ie. about 1080 GiB [2]) > This has been running for 763 days non-stop. Like the first machine, > it hasn't used any of the reserved blocks yet. It's about 1.3% of the > way through its min expected lifespan.[3] > Estimated total lifespan time: 160 years. > > -Toby > > 1: ie. 3000 write/erase cycles for MLC; in practice you seem to get > quite a bit more though, according to testers. > 2: This drive doesn't report the actual NAND writes, just LBAs > written, but you can roughly convert those out; call each LBA 512 > bytes, and then multiply the total by a conservative 1.1 to allow for > write-amplification; we come up with about 1080 gigabytes. > 3: This machine is running a cheaper type of TLC-based SSD, so > theoretical amount of erase/write cycles are just 1000. -- Turning and turning in the widening gyre The falcon cannot hear the falconer Things fall apart; the center cannot hold Mere anarchy is loosed upon the world _______________________________________________ luv-main mailing list [email protected] http://lists.luv.asn.au/listinfo/luv-main
