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

[Mouse]

>>> I hear the consistency of units argument.  But the storage industry
>>> didn't switch to using strict SI units (...)
>> Genuine question: did they actually switch?  Or did they almost
>> always used powers of ten?
> They switched.  In 1989 if I remember correctly, and I'm pretty sure
> I do.

Yes, they switched.  I think I even still have a few disks that are
honestly labeled; I had a quick look through my pile of disks here at
home and didn't find any, but they would be the (digitally) smallest of
my drives and thus most likely to be in storage instead of at home.

I did find two curious cases.

One is a Hitachi laptop drive with no single-figure capacity marking;
the only indication of how much it contains is "CYL 8944 H15 S63".

The other is an SSD which is labeled as "128MB"; upon connecting it to
a machine, I find it is 128 of the same bogus MBs that gave us 1.44MB
floppies!  It reports exactly 256000 sectors of 512 bytes each.

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