On Fri, Aug 25, 2017 at 7:31 AM, Eryu Guan <eguan@xxxxxxxxxx> wrote:
> On Thu, Aug 24, 2017 at 02:48:26PM +0200, Ilya Dryomov wrote:
>> lvm utility in Ubuntu 14.04 LTS treats -l 100%FREE as a hard number and
>> not as an approximate upper limit. With ~5G scratch partition and ~128M
>
> I just looked for an Ubuntu 14.04 LTS box and confirmed lvcreate does
> support '-l 100%FREE'. Even on distributions as old as RHEL6 support
> this usage too. Perpahs there were other things went wrong in your test
> environment?
The syntax is supported, but the semantics are different. Compare
lvcreate(8) man pages on Ubuntu 14.04 LTS and something more recent:
"When expressed as a percentage, the number is treated as an
approximate upper limit for the total number of physical extents
to be allocated (including extents used by any mirrors, for example)."
In the example I gave, '-l 100%FREE' translates to 1310 PEs on Trusty
vs ~60 PEs on a recent Fedora.
Thanks,
Ilya
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