[Bug 1424114] Re: lvm snapshot is not being autoextended

[Josip Rodin]

On Ubuntu 14, it doesn't seem to work with monitoring = 1 set, either. I
had also tried doing vgchange --monitor y --poll y volumegroup, and
lvcreate --snapshot --monitor y ... and there was no effect.

Testing on Ubuntu 16 now

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Title:
  lvm snapshot is not being autoextended

Status in lvm2 package in Ubuntu:
  Confirmed

Bug description:
  After setting auto extend threshold and rebooting, lvm snapshots are
  not being auto extended.

  Steps to recreate:
  1. Using Ubuntu 14.04 LTS
  2. Set snapshot_autoextend_threshold to less than 100
  # grep autoext /etc/lvm/lvm.conf 
      snapshot_autoextend_threshold = 50
      snapshot_autoextend_percent = 20
  3. Reboot server to have lvm reread lvm.conf
  4. Create a snapshot of a mounted logical volume
  # lvcreate -s /dev/testVG/testLV -L 1G -n testLVsnap
  5. Make modifications to mounted logical volume
  6. List logical volumes and snapshots
  # lvs
    LV         VG     Attr      LSize  Pool Origin Data%  Move Log Copy%  Convert
    testLV     testVG owi-aos-- 10.00g                                           
    testLVsnap testVG swi-a-s--  1.00g      testLV  95.04

  What I expected to have happened:
  Once Data% of snapshot reached the snapshot_autoextend_threshold, the snapshot logical volume should have been auto extended.

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