PV size is reported as 50GB but is physically 54GB

Gabriel M Dragffy dragffy at yandex.ru
Fri Sep 1 20:55:16 UTC 2006

On Fri, 2006-09-01 at 15:38 +0200, Alan McKinnon wrote:
> The physical partition is 54G large, but the logical volume on 
> it (most definitely *not* the same thing) is 50G - the rest is 
> LVM overhead. It needs to initialize the partiton to make a pv 
> out of it, the extents need to be created and tracked, and 
> something somewhere is recording which extents are assigned to 
> which lvs. All this takes space
4GB of space seems a bit steep, that's like 5% of my total disc size.

> > I also have another discrepency in sizes reported by LVM, or
> > for example using df. However I have saved that for another
> > topic as I think it is unrelated to this particular question.
> This entire industry can't seem to make up it's mind as to 
> exactly what a mega byte is. It can be:
> 1000 * 1000 bytes
> 1000 * 1024 bytes
> 1024 * 1024 bytes
> and we have MB, Mb, mB and mb abbreviations to confuse the 
> issue...

I know of these differences, but I kind of thought computer tools would
be using the same system and it was just the manufacturers using 1000
bytes so that they could market drives that really didn't quite have the

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