Is there TRIM support for solid state drives (SSD) in RHEL6?

Solution Verified - Updated -

Issue

  • Is there TRIM (SCSI or block discard) support for SSD in RHEL6?
  • Is TRIM properly transmitted through layers like LVM, MD (software raid), filesystems etc?
  • Is SCSI discard on or off by default for ext4?
  • What is fstrim tool and how can we use discard function to reclaim my unused disk space for ext4 filesystem on ssd disk drives?
  • How to configure filesystem with discard mount option to reclaim unused blocks on disk drives?
  • Storage Reclamation
  • What is the official/recommended tools to zero out deleted/free space under RHEL? Is there any documentation available to perform this operation?

Environment

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

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