Mick <michaelkintz...@gmail.com> wrote: > On Monday 13 Feb 2017 13:17:14 Poison BL. wrote: > > On Mon, Feb 13, 2017 at 11:44 AM, Daniel Frey <djqf...@gmail.com> > > wrote: > > > On 02/12/2017 02:40 PM, Alan Grimes wrote: > > > > So does anyone have any evidence of a current generation SSD > > > > lasting more than 20 days? > > > > > > I have tried various SSDs (multiple brands and generations) over > > > the last maybe five years and found that they're very unreliable > > > (multiple brands too.) > > > > > > I know everyone's saying these things are reliable but out of > > > four SSDs I own, I've had to replace three, some more than once. > > > > > > I just don't use them for anything I want to stay working. Right > > > now I keep them in my mythtv frontends as I can restore the OS > > > easily. One one of them the company involved (Kingston) even sent > > > me a newer drive/model as it was replaced more than once. > > > > > > I know they're fast. But what's the point of going 500 MPH and > > > crashing into a mountain with no chance of repair/recovery. I > > > went back to a (relatively) slower rust raid10, and it's been > > > reliable for the last four years. At least with a hard drive > > > failure, you stand /some/ chance at recovery, not zero. > > > > > > The one SSD that hasn't had to have been replaced under warranty > > > is in my laptop which I generally use maybe a dozen times a year. > > > I fully expect it to die one of these times when I boot the > > > laptop (it's one of the old models.) > > > > > > My experiences are with Samsung, Kingston, Intel, Crucial and > > > AData SSDs. The last one I bought because these things I view as > > > throwaway devices (the warranty expired on the original Crucial) > > > and don't want to spend big money on them. I have noticed the > > > AData SSD's performance is not as fast now as it was new (maybe > > > 1.5 years ago?) So it'll probably pack it in soon too. > > > > > > Dan > > > > I've had more than one spinning rust drive fail hard over the years > > as well, though yes, you do usually have some chance of recovery > > from those. Gambling on that chance by leaving a given disk as a > > single point of failure is still a bad idea, spinning disk or not. > > The point that you went from single-disk SSD back to raid10 makes > > me question why, if your uptime requirements (even if only for your > > own desires on a personal machine) justify raid10, you weren't on > > at least raid1 with the SSD setup. > > > > As for performance degredation on SSDs, that I've definitely seen > > on pretty much every brand, though I've had good luck doing clean > > reloads on samsungs once or twice to get speeds back up some > > (somehow, even trim doesn't seem to keep things at their best).
It really helps when you always left some free space on the drives. I used fstrim to reserve additional 20% free space on my SSD drives. I said additional because manufacturers always(?) reserve some percentage free space for overprovisioning. This not only expands the lifetime of SSDs but also helps to preserve write performance. > > I can't say they're more or less reliable than spinning disks, > > though they do have the benefit of no moving parts to wear out over > > time (thermal cycles can still cause a physical failure on them, > > though). > > Have you noticed a difference between mounting partitions on them > with the discard option, Vs running fstrim on a cron job? I noticed a big performance impact with my old Corsair 60GB SSD (Force3 IIRC) when I used the discard option in fstab. So I decided to use the fstrim command instead, before I did my weekly backups. The fstrim command always needed about 10 minutes or so to complete its job. About 1 year ago I replaced the Corsair with a Samsung SSD 850 PRO. With this device I did not notice a performance impact when the discard option is enabled and so I decided to use it. Btw: On the Samsung SSDs the fstrim command only needs a second or so to do its job. I never used a benchmark program to check if there is really no difference. But at least I don't notice any in my every day use. My old Corsair SSD (bought it in 2011) is still in use as swap space device in my Win7 machine (together with a SSD 850 PRO as system device). Before that, I used it as system disk on my gentoo machine. I also used it for my users mail and thumbnail directories and also for /log, /tmp, /var and the whole portage tree. Before I upgraded my gentoo machine to 16GB RAM I also used the SSD for portages temporary files. So it was really in heavy use. And is still running without problems. Before I installed the Corsair SSD into my Win machine, I used fstrim to increase the reserved space to 50%. I hope that it will run for at least another 6 years. ;-) -- Regards wabe
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