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 larger. 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: Working: kernel-4.15.0-0.rc8.git0.1.fc28.x86_64 device-mapper-1.02.146-1.fc28.x86_64 lvm2-2.02.177-1.fc28.x86_64 Not working: kernel-4.16.0-0.rc4.git0.1.fc28.x86_64 device-mapper-1.02.146-1.fc28.x86_64 lvm2-2.02.177-1.fc28.x86_64 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
