Yes, ST18000NM0092-3CX103. I think most, if not pretty much all, of the Mach.2s for which public bench results have also been posted are ST18000NM0092s. 2X14s are SAS only and 16 TB 2X18s seem to be unicorns. I also can’t recall ever coming across data for the 18 TB SAS variants (ST18000NM0272 and ST18000NM0012).
@John-S, who’s a storage architect for Seagate, has said the only disadvantage to the SATA versions is they can deadlock if you try stupid hard to break them. I hit the 465 MB/s limit even in SEQ2M Q1T2, which really shouldn’t be a queue stall as each actuator only ever gets one command at a time and idles between commands. RND4k benches with DiskSpd hitting both halves of the drive simultaneously are pretty much a straight doubling, which doesn’t suggest for stalling either, though that may not be a complex enough use case.
I suspect Windows may be a limitation as @Oblivious911 got 474 MB/s with a 2X14 on Ubuntu. 10% below Seagate’s spec of 524, which isn’t too bad for software RAID0. Definitely better than the -15% of 465 out of 545 MB/s when JBODing ST18000NM0092.
Yeah, we mostly run IronWolf Pro on cooler storage for its 550 TB annual WRL as some of our drives get up around 500 TB/year. Recent-ish Exos is rated for 0.35% AFR under 24x7 operation, though, so it’s pretty much what’s in our rackmount arrays. One reason I have a 2X18 as I was having to throttle some of my work pretty hard not to blow up WRL.
Eh? I usually see new prices of US$ ~20/TB for enterprise hard drives, ~65/TB for consumer flash, and mostly 100-175/TB for enterprise flash. Upper end enterprise goes over US$ 200/TB, sure, but there’s lots of <10x options.
Mmm, 550 TB/year WRL on a five year warranty is 0.38 DTPD for a 20 TB drive. Five year warranty consumer TLC is 0.33+ DWPD. DWPD on the QLC I know offhand’s a bit higher (~0.4) due to three year warranty.
That’ll move around with drive and workload specifics but it seems to me the main point is IO intensity tends to cost, either in reads counting towards WRL, consumer flash replacement on sufficient writes, or up front for 1 DWPD enterprise flash.