NS0-509: NetApp Certified Implementation Engineer–SAN Specialist, Practice Exam

By Netapp · Question Mode

QuestionQ25

ONTAP SAN implementation testing and troubleshooting

A thin-provisioned LUN was created with the following command:

lun create -vserver vs1 -path /vol/vol1/lun1 -size 500G -ostype windows_2008 -space-reserve disabled -space-allocation disabled

Your Windows 2016 host reports 200 GB free on lun1. However, lun1 reports 0 bytes free on the storage cluster.

What should you do to resolve this problem?

Explanation

ONTAP requires LUN space allocation to be enabled for T10 SCSI thin provisioning, including UNMAP-based reclamation of blocks the Windows host has freed. With space allocation disabled, host filesystem free space is not returned to the thin-provisioned LUN’s backing storage, so ONTAP can show no free capacity despite free space reported by Windows.

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