How can I verify that my RHEL system can freeze and thaw the filesystems properly?

Solution Unverified - Updated -

Issue

Sometimes during filesystem freeze and thaw by a third-party backup or snapshot application, the system may hang and become unavailable, or may fail to freeze the filesystems entirely.

  • How can we test our system to make sure that our RHEL system will freeze and thaw filesystems?
  • When the device where fsfreeze is used on, is device mapper, are there any points to notice?
  • When the device where fsfreeze is used on is provided by device mapper, are there any points to notice?
  • What is the order in which fsfreeze is working?

Environment

  • Red Hat Enterprise Linux (RHEL) 5/6/7
  • ext3/ext4/xfs filesystems
  • fsfreeze

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