3 ms·

Sure but the 100.000 writes per bit!? To me data integrity and longevity are paramount! These have same idle power btw, but ofcourse 2W on read/write is bad b

by bullen 5y ago

Sure but the 100.000 writes per bit!? To me data integrity and longevity are paramount! These have same idle power btw, but ofcourse 2W on read/write is bad but I rather use these $1000 in 2011 50nm SLC industrial drives and compress my database than buy some MLC/TLC/QLC drive made today with 14nm!

wtallis 5y ago
You should be aware that SSDs perform wear leveling, so the key metric is not how many program/erase cycles the underlying flash can handle on a per-block basis, but the total amount of writes the drive can handle, usually expressed in TB or PB. Unless you have measured your own workload in enough detail to know otherwise, it is extremely unlikely you actually need to use SLC NAND. The market has almost completely abandoned SLC NAND for good reason, and your use case probably isn't that special (though if it is, I'm sure we could have an interesting conversation about it). Absent clear evidence to the contrary, I'm going to assume that a modern TLC SSD could easily fulfill your actual write endurance and data retention requirements, because that's the conclusion that has been reached by all of the big corporations who have been using modern SSDs in production at scale.
- bullen 5y ago
  Maybe, but I'm factoring in the time spent on maintenance at 100x the cost because that is not something I want me or my kids to have to do ever! Meaning with 5 million customers on my MMO we have 250 years of all of them playing every day with these drives. Which gives us margin!
- gpapilion 5y ago
  The wildcard here is the garbage collection in the drive, and bad firmware with high write amplification. I’ve seen TLC devices go bad within a year where the vendor optimized for full page P/E cycles. That said these were high transaction server workloads, and typical home use would be challenged to get to that kind of wear.

by bullen 5y ago

wtallis 5y ago

You should be aware that SSDs perform wear leveling, so the key metric is not how many program/erase cycles the underlying flash can handle on a per-block basis, but the total amount of writes the drive can handle, usually expressed in TB or PB. Unless you have measured your own workload in enough detail to know otherwise, it is extremely unlikely you actually need to use SLC NAND. The market has almost completely abandoned SLC NAND for good reason, and your use case probably isn't that special (though if it is, I'm sure we could have an interesting conversation about it). Absent clear evidence to the contrary, I'm going to assume that a modern TLC SSD could easily fulfill your actual write endurance and data retention requirements, because that's the conclusion that has been reached by all of the big corporations who have been using modern SSDs in production at scale.

bullen 5y ago
Maybe, but I'm factoring in the time spent on maintenance at 100x the cost because that is not something I want me or my kids to have to do ever! Meaning with 5 million customers on my MMO we have 250 years of all of them playing every day with these drives. Which gives us margin!
gpapilion 5y ago
The wildcard here is the garbage collection in the drive, and bad firmware with high write amplification. I’ve seen TLC devices go bad within a year where the vendor optimized for full page P/E cycles. That said these were high transaction server workloads, and typical home use would be challenged to get to that kind of wear.