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



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


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