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



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


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