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Misaligned LUNs reported for FC LUNs in Ontap

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Applies to

  • Ontap 9
  • FC
  • VMware ESXi host

Issue

  • LUN alignment for LUN in cluster is showing as misaligned 

cx-xx-xx-aff::*> lun alignment show /vol/vol1/lun1
              Vserver Name: svm_name
                  LUN Path: /vol/vol1/lun1
                   OS Type: vmware
                 Alignment: misaligned
Write Alignment Histogram: 82, 15, 0, 0, 0, 0, 0, 0
  Read Alignment Histogram: 82, 0, 0, 0, 0, 0, 3, 11
      Write Partial Blocks: 1
       Read partial Blocks: 3

  • This misaligned LUN hosted 3 Vms, where all these 3 VMs have different guest OS running on them as below
    • 1x Cisco ISE
    • 1x Power IQ
    • 1x VMware vCenter

 

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