[linux-lvm] pvcreate: vfat signature detected on /dev/sda5

John L. Poole jlpoole56 at gmail.com
Sat Dec 10 03:35:24 UTC 2016

I have a new 4TB disk on a new server which I'm installing Xen on.
I've always intended that I use whatever small partitions to get a 
system up and running
and then dedicate the remaining balance of the disk to LVM.

After much hassle I finally got my Xen instance up on this EUFI based unit,
and I created a new partition, /dev/sda5, using fsdisk.

When I tried to create a new volume, I received a warning about
a vfat signature.  I aborted.

Note: /dev/sda2 is a VFAT system which is required by EFI.

I had not previously create sda5, I just created sda1 - sda4 until
I finally had a dom0 server operating.

Here's the layout of the disk:

Device        Start        End    Sectors  Size Type
/dev/sda1      2048       6143       4096    2M BIOS boot
/dev/sda2      6144     268287     262144  128M EFI System
/dev/sda3    268288    1316863    1048576  512M Linux filesystem
/dev/sda4   1316864   42272767   40955904 19.5G Linux filesystem
/dev/sda5  42272768 7814037134 7771764367  3.6T Linux LVM

Here's my attempt to create a physical volume:

    zeta jlpoole # pvcreate /dev/sda5
    WARNING: vfat signature detected on /dev/sda5 at offset 54. Wipe it? 
[y/n]: n
      Aborted wiping of vfat.
      1 existing signature left on the device.
      Aborting pvcreate on /dev/sda5.
    zeta jlpoole #

Is the warning something I need to be concerned about when
creating a physical volume on /dev/sda5?  I'm wondering if it was 
looking at another
partition and bubbling up just as a precaution.

Thank you,


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