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

[Phil Stracchino]

On 5/2/21 12:51 PM, Robert Toegel wrote:
> 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)


Rapid Unplanned Disassembly is Elon Musk's term.


I hear the consistency of units argument.  But the storage industry
didn't switch to using strict SI units out of a deep respect for the
scientific system.  They switched (and not all together, in dribs and
drabs, Seagate first) to the storage industry gigabyte because it let
them label the same disk with a bigger number.

And now we're in the bad place where gigabyte means a different thing
depending whether you're talking about memory or storage.  And memory
can't be simply declared to be powers of 10 instead of powers of 2 and
still come out to manageable numbers.  Binary addressing doesn't work
that way.  And then we get into flash memory devices that use storage
industry gigabytes on top of a memory physical layer, and it's just a
hellish mess and all capacity markings are approximations.



-- 
  Phil Stracchino
  Babylon Communications
  phils at caerllewys.net
  phil at co.ordinate.org
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