How to increase the read ahead support on devices, lvm volumes ?

Solution Verified - Updated -

Issue

  • How to increase the read ahead support on devices for a SAS server. Are there any best practice ?
  • Can we set the read ahead value at lvm level, on the block device or on all?
  • What is the default read ahead value globally?

Environment

  • Red Hat Enterprise Linux(RHEL) 6
  • Red Hat Enterprise Linux(RHEL) 5
  • LVM volume.

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