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Why Are Some NetApp ONTAP Volumes/LUNs Thick Provisioned and Others Thin When Using OpenStack Cinder?

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Applies to

  • NetApp ONTAP 9.x (including 9.14.1P6)
  • NetApp All SAN Array (ASA-C800)
  • OpenStack Cinder (any distribution, e.g., Red Hat OpenStack)
  • NetApp Cinder driver (NFS/iSCSI/Fibre Channel)

Issue

Customer observed that, in their environment where OpenStack Cinder is used with NetApp ONTAP as the backend, some LUNs/volumes are thick provisioned and some are thin provisioned. This behavior is inconsistent and not clearly understood by the storage or OpenStack teams.

Sample log output:

cluster1::> lun show -vserver vs-openstack -lun * -fields space-reserve
...
vs-openstack /vol/overcloud18/volume-ae3bc8e1-2aa4-4a17-81ec-0ab6f4adeb19 space-reserve enabled
vs-openstack /vol/overcloud18/volume-b6c6bd78-9f51-418d-818a-43b24afa7d6c space-reserve disabled
...

 

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