Why is the read performance of my RAID 1 (mirroring) LV limited to the read throughput of a single disk?

Solution Verified - Updated -

Issue

  • The read perfomance of my RAID 1 LVM Volumes is limited to the maximum read performance of one disk
  • In my environment each RAID 1 Logical Volume consists of 2 disks and therefore I would expect the read performance to almost double. Why is this not the case?

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 7

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