I have seen a similar issue with Ubuntu 14.10 Repro steps:
root@ubuntu-amd64:~# lsb_release -cd Description: Ubuntu 14.10 Codename: utopic # after reboot root@ubuntu-amd64:~# cat /etc/lvm/lvm.conf | grep " snapshot_autoextend" snapshot_autoextend_threshold = 80 snapshot_autoextend_percent = 20 root@ubuntu-amd64:~# vgs VG #PV #LV #SN Attr VSize VFree vg1 1 0 0 wz--n- 20.00g 20.00g root@ubuntu-amd64:~# lvcreate -n vol1 -L 100MB vg1 Logical volume "vol1" created root@ubuntu-amd64:~# lvs LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert vol1 vg1 -wi-a---- 100.00m root@ubuntu-amd64:~# lvs LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert snap1 vg1 swi-a-s-- 12.00m vol1 0.00 vol1 vg1 owi-a-s-- 100.00m root@ubuntu-amd64:~# dd if=/dev/zero of=/dev/vg1/vol1 count=11 bs=1MB 11+0 records in 11+0 records out 11000000 bytes (11 MB) copied, 0.087546 s, 126 MB/s root@ubuntu-amd64:~# lvs LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert snap1 vg1 swi-a-s-- 12.00m vol1 87.83 vol1 vg1 owi-a-s-- 100.00m At this point I expected the snap1 volume to be auto extended based on the 80% setting in lvm.conf. However as can be seen the snapshot is 87% and the size stays as 12MB. If I continue writing the snapshot gets fill and disabled. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1424114 Title: lvm snapshot is not being autoextended To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1424114/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs