Re: [linux-lvm] can't use LVM2 - "Failed to write physical volume"? [SOLVED]

[Tomasz Chmielewski <mangoo@wpkg.org>]

Tomasz Chmielewski schrieb:
> It seems to me that for some reason it's not possible to create a 
> physical volume on a DRBD device. Below, we can see that running 
> "pvcreate" succeeds and than fails, then it succeeds again etc.:
> 
> # pvcreate -d -v /dev/drbd0
>     Set up physical volume for "/dev/drbd0" with 976544952 available 
> sectors
>     Zeroing start of device /dev/drbd0
>   Physical volume "/dev/drbd0" successfully created
> 
> # pvcreate -d -v /dev/drbd0
>     Wiping cache of LVM-capable devices
>     Set up physical volume for "/dev/drbd0" with 976544952 available 
> sectors
>     Zeroing start of device /dev/drbd0
>   Failed to write physical volume "/dev/drbd0"

Looks like LVM doesn't like some raw devices?

I added a partition to /dev/drbd0 with fdisk.

Then, I added a drive mapping with kpartx.

It works fine now.

# kpartx -a -v /dev/drbd0
add map drbd0p1 : 0 976543092 linear /dev/drbd0 63

# pvcreate -d -v /dev/mapper/drbd0p1
     Set up physical volume for "/dev/mapper/drbd0p1" with 976542708 
available sectors
     Zeroing start of device /dev/mapper/drbd0p1
   Physical volume "/dev/mapper/drbd0p1" successfully created


Anyway, why does it fail if I want to set up LVM on raw DRBD device? A 
bug or a feature?



-- 
Tomasz Chmielewski
http://wpkg.org