A couple of questions about SSDs

[Valeri Galtsev]

On Thu, 15 Oct 2020 08:26:39 +0200
Andrea Venturoli <ml at netfence.it> wrote:

> On 10/14/20 8:22 PM, Ralf Mardorf wrote:
> 
> > In my desktop PC are 5 SSDs. Four are connected to the mobos SATA 3
> > connectors and one is connected to a SATA 2 connector. Four are
> > 223.57 GiB sized and one is 447.13 GiB sized. I'm to lazy to check
> > how old each of them is, but IIRC the oldest is around 3½ years old
> > and the vendor's software mentions that the "health" is at 64%, the
> > system drive is one of the newer SSDs, maybe around 2 years old,
> > "health" 57%.  
> 
> So your SSDs seems to last 4-6 years.
> 
> 
> 
> > In my experiences HDDs last for around 2 years, if you turn the
> > computer on and off very often and for around 7 years, if the
> > computer runs more or less 24/7.  
> 
> I'm currently typing on a box running on 13 years old HDs.
> They've been used on a server (so always on) for maybe 5-6 years,
> then demoted to a desktop machine and they've been cycle-powered
> daily for at least other 6.
> I even have older, still working, rust around.
> 

I first must confess: I always was very picky about choice of hard
drives. And I did manage to stick with most reliable ones. That said, I
do have machines in the server room running for 10 years, always up,
except for occasional reboot (Linux kernel or glibc update...). All
still with original drives. Of each 10-20 drives during this time only
1-2 failed (or exhausted badblock reallocation table) and have been
replaced.

Incidentally, always up is the least demanding use of spinning drive.
Well manufactured that is, and positioned horizontally (with axis of
platters vertical). If the above observed, the limiting factor will be
the number of spin downs or power offs when spring loaded arm let loose
and hits the post being stopped at "parking track".

SSDs have their use when you need really high speed (or reading), so we
still use them for the purpose, even realizing they may loose in
durability department.

Valeri

> When an HD gets to small/slow for its purpose, I replace it with a 
> bigger shinier one, but I just move the old one to a less demanding
> use, backups/archive being the lower step in their life.
> 
> 
> 
> > However, my guess is, due to a lack of experiences with SSDs, that
> > they last for as long as HDDs do last.  
> 
> Seems not, then.
> 
> 
> 
>   bye & Thanks
> 	av.
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-- 
++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247
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