Re: [linux-lvm] fdisk and lvs size differences

[Tomasz Chmielewski <mangoo wpkg org>]

Bryn M. Reeves schrieb:
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> Tomasz Chmielewski wrote:
> > Let's say I have a 500GB logical volume:
> >
> > # lvs | grep san2_data
> >   san2_data                  san1 -wi-a- 500.00G
> >
> >
> > fdisk will report a bigger number:
> >
> > # fdisk -l /dev/san1/san2_data
> >
> > Disk /dev/san1/san2_data: 536.8 GB, 536870912000 bytes
>
> It's just units; the G in lvm's output signifies powers-of-two units,
> wheras the GB reported by fdisk is in powers-of-ten (SI units).
>
> See the lvm man pages for a description of the units supported (lower
> case are SI, upper case are powers-of-two).

What lvm manual exactly? I didn't find anything about upper/lower case 
units supported in "man lvcreate" or "man lvm". In fact, it didn't make 
a difference here whether I used "g" or "G".

Of course, I could calculate it manually, but I'd rather have it done 
automatically.


# lvcreate -L500g -n san2_data san1
  Logical volume "san2_data" created

# fdisk -l /dev/san1/san2_data

Disk /dev/san1/san2_data: 536.8 GB, 536870912000 bytes


# lvcreate -L500G -n san2_data san1
  Logical volume "san2_data" created

# fdisk -l /dev/san1/san2_data

Disk /dev/san1/san2_data: 536.8 GB, 536870912000 bytes


# lvm version
  LVM version:     2.02.07 (2006-07-17)
  Library version: 1.02.08 (2006-07-17)
  Driver version:  4.11.0

This is on Debian Etch.



--
Tomasz Chmielewski
http://wpkg.org