The delay in the quick formatting process of a 2 TB LUN from an XtremIO storage array when

installing a new Microsoft Windows 2012 host is likely caused by the UNMAP feature being enabled.

The UNMAP command is part of the SCSI thin provisioning set, which allows the host to inform the

storage array which blocks are no longer in use and can be reclaimed. When UNMAP is enabled, the

quick format process may take longer because the storage array needs to process these UNMAP

commands and perform the necessary space reclamation tasks1.

It’s important to note that while UNMAP can improve storage efficiency, it can also introduce

overhead during operations like formatting, which can lead to delays. For detailed procedures and

best practices, it is recommended to consult the Official Dell XtremIO Deploy Achievement document

or reach out to Dell support for the most accurate guidance.