Am Fri, 12 May 2017 15:02:20 +0200 schrieb Imran Geriskovan <imran.gerisko...@gmail.com>:
> On 5/12/17, Duncan <1i5t5.dun...@cox.net> wrote: > > FWIW, I'm in the market for SSDs ATM, and remembered this from a > > couple weeks ago so went back to find it. Thanks. =:^) > > > > (I'm currently still on quarter-TB generation ssds, plus spinning > > rust for the larger media partition and backups, and want to be rid > > of the spinning rust, so am looking at half-TB to TB, which seems > > to be the pricing sweet spot these days anyway.) > > Since you are taking ssds to mainstream based on your experience, > I guess your perception of data retension/reliability is better than > that of spinning rust. Right? Can you eloborate? > > Or an other criteria might be physical constraints of spinning rust > on notebooks which dictates that you should handle the device > with care when running. > > What was your primary motivation other than performance? Personally, I don't really trust SSDs so much. They are much more robust when it comes to physical damage because there are no physical parts. That's absolutely not my concern. Regarding this, I trust SSDs better than HDDs. My concern is with fail scenarios of some SSDs which die unexpected and horribly. I found some reports of older Samsung SSDs which failed suddenly and unexpected, and in a way that the drive completely died: No more data access, everything gone. HDDs start with bad sectors and there's a good chance I can recover most of the data except a few sectors. When SSD blocks die, they are probably huge compared to a sector (256kB to 4MB usually because that's erase block sizes). If this happens, the firmware may decide to either allow read-only access or completely deny access. There's another situation where dying storage chips may completely mess up the firmware and there's no longer any access to data. That's why I don't trust any of my data to them. But I still want the benefit of their speed. So I use SSDs mostly as frontend caches to HDDs. This gives me big storage with fast access. Indeed, I'm using bcache successfully for this. A warm cache is almost as fast as native SSD (at least it feels almost that fast, it will be slower if you threw benchmarks at it). -- Regards, Kai Replies to list-only preferred. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
