Recently in Fedora something changed that stops us from creating small
LVs for testing.
An example failure with a 64 MB partitioned disk:
# parted -s -- /dev/sda mklabel msdos mkpart primary 128s -128s
Warning: The resulting partition is not properly aligned for best performance:
128s % 65535s != 0s
# lvm pvcreate --force /dev/sda1
/dev/sda1: Data alignment must not exceed device size.
Format-specific initialisation of physical volume /dev/sda1 failed.
Failed to setup physical volume "/dev/sda1".
Obviously if I were to increase the beginning of the partition to
65536 sectors (32 MB) then there wouldn't be much space left for data.
Another possibly related issue happens if I use a 32 MB disk and leave
out the partition table (again, this used to work in Fedora up to recently):
# lvm pvcreate --force /dev/sda
# lvm vgcreate VG /dev/sda
# lvm lvcreate -l 100%FREE -n LV /dev/VG
Calculated size of logical volume is 0 extents. Needs to be larger.
guestfsd: error: Calculated size of logical volume is 0 extents. Needs to be
I checked the lvm2 git repo and didn't see any recent changes which I
thought could affect this.
I'm not sure what component is responsible. I have two very similarly
configured machines where it works with one but not with the other.
The only difference seems to be the kernel:
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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