What happens if a thin provisioned logical volume fills up with more than the underlying pool volume provides?

Solution Unverified - Updated -

Issue

  • What happens if a thin provisioned logical volume fills up with more than the underlying pool volume provides?
  • I use LVM thin provisioning. I have a pool volume, what happens when writing more data in the thin volumes in the pool volume than the pool volume offers?

  • Why do I get the following errors, writing to a thin provisioned volume when the underlying pool volume is too small?

    Nov 30 13:21:41 rhel6u3a kernel: device-mapper: thin: 253:4: reached low water mark, sending event.
Nov 30 13:21:41 rhel6u3a kernel: device-mapper: thin: 253:4: no free space available.

Environment

  • Red Hat Enterprise Linux 6
  • LVM thin provisioning (TechPreview as of RHEL6.3)

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