[ale] OT: SSD format

[Brian Stanaland]

The importance of SSD firmware hit home for HPE a while back.

https://www.hpe.com/us/en/services/sas-ssd-advisory.html

Because of a bug in firmware, SSDs were failing at either 4 years, 206 days
16 hours or 3 years, 270 days, 8 hours. Absolutely nothing physically wrong
with the drives. But no data could be written OR retrieved.

Brian

On Sat, Apr 9, 2022 at 10:42 AM DJPfulio--- via Ale <ale at ale.org> wrote:

>
> On 4/8/22 16:06, Boris Borisov via Ale wrote:
> >
> > My thoughts are that this tool should be able to ask SSD controller
> > to remap the available space so bad memory block to be avoided.
>
> SSDs have been doing this for 5+ yrs. Quality SSDS for twice that.
> What an SSD provides to the OS is 100% virtual. Has nothing to do with
> anything physical inside the chips. How they handle wear leveling is a
> closely guarded secret for SSD makers.
>
> More expensive SSDs are over-provisioned with extra chips to swap into use
> as needed. This is all within the SSD controller and the quality of that
> software is what differentiates the great SSDs from those with names we
> know, but crappy warranties.  If an SSD doesn't say (or refuses to say) the
> TBW endurance numbers, run away from that vendor.
>
> I try to leave 20% of my SSD unused.  That seems to allow the extra space
> to be used on cheaper SSDs as an over-provisioned storage area, drastically
> improving lifetime.
>
> IMHO.
>
> In short, there is nothing to be done.
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