[rescue] expanding a ZFS pool: leave slack space?

[Robert Toegel]

I agree with you. Look what happened with NASA when two different "places"
didn't use units at all and they landed a Mars probe at who knows how many
km/hr, way beyond craft specifications. (QUD, quick unexpected disassembly
I think they call it)

Bob (former science teacher)

On Sun, May 2, 2021, 02:32 Romain Dolbeau <romain at dolbeau.org> wrote:

> Le dim. 2 mai 2021 C  02:15, Mouse <mouse at rodents-montreal.org> a C)crit :
> > Only for disk-maker-redefined values of "TB".  At least in my
> > experience, "4TB" disks are a smidgen under 3.6387 actual TB
>
> 'Tera' has meant 10^12 since 1960 (along 'Giga' for 10^9), when the SI
> was introduced as an update to the Metric system.
> Larger decimal prefixes were introduced up to in 1975 and 1991.
>
> Why would you expect the manufacturer to not comply with a standard in
> use in 95+% of the countries in the world?
> They're simply using a standard-compliant notation that's easier for
> most people than "32*10^12", let alone "3.6387*2^30"
>
> No standard body has ever defined the Tera as anything different from
> 10^12.
>
> The IES has defined binary prefixes to handle situations where
> power-of-2 are useful.
> It's very simple to write 32 GiB or 3.64 TiB and be unambiguous.
>
> Sorry for the rant, but it's one of my pet annoyances and I keep
> pestering my colleagues to make sure they use standard-compliant units
> and prefixes in documentation to make things clear.
> When you use 'MiB', 'GiB' or 'Tib' everywhere for memories and caches
> and other Po2 structures, the use of 'GB' or 'TB' for storage or 'GHz'
> for frequency doesn't raise so many questions.
> Different prefixes for different use cases.
>
> For those interested in a bit of history, the BIPM has the older
> brochures of the SI online:
> <https://www.bipm.org/en/publications/si-brochure>
> 'Tera' is on page 13 of the 1970 brochure, and at the time was still
> the largest SI prefix (negative-power-of-10 prefixes were introduced
> sooner as they had more use in physical sciences at the time).
>
> Cordially,
>
> --
> Romain Dolbeau
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