How can I prioritize my applications above an LVM mirror sync operation so they are not starved out while the sync is ongoing in RHEL 6

Solution In Progress - Updated -

Issue

  • We experience a long freeze of IO when we use lvconvert to recreate a mirror set.
  • When creating or converting a mirror, we see a lot of I/O and our applications' I/O becomes very slow or gets delayed for some time while the resync completes
  • Is there a way to deprioritize the LVM processes that issue I/O to devices during a mirror sync?

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • lvm2 with RAID 1 mirrors

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