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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