![]() How to verify whether SCSI UNMAP is enabled or disabled on a Windows host *** WHU 6.0.1 -> turns in-band UNMAP offįsutil behavior query disabledeletenotify See the Interoperability Matrix Tool for recommendations specific to your configuration.Data ONTAP 8.2.x – in 7-Mode and clustered Data ONTAP-> WUHU 7.1. ![]() When using Windows native DSM (MSDSM), use the corresponding Windows Host Utilities (WHU) version from the following:.For server Core editions, this is performed by running the PowerShell cmdlet 'get-sandisk' command.From Windows MMC, locate the storage section Data ONTAP DSM Management, right-click and select Refresh. Data ONTAP DSM 4.0 and later checks Data ONTAP versions, and will adaptively set in-band UNMAP accordingly.How to enable/disable the feature on Windows hosts Note: If you change the space_alloc or space-allocation setting after provisioning a LUN to a Windows host, reboot the Windows host for it to discover the changed setting.For a LUN to advertise support for and accept SCSI UNMAP commands, enable the space-allocation option on LUNs, which you expect to use this feature with. For clustered Data ONTAP, support for SCSI UNMAP begins in the 8.2 release family.Earlier than Data ONTAP 8.2, SCSI UNMAP was fully functional without space_alloc being enabled, even though not all of the supported T10 Thin Provisioning features were turned on, unless the option was set. Starting in Data ONTAP 8.2 7-Mode, a change was implemented that required space_alloc option be enabled on a LUN for it to advertise support for, and accept SCSI UNMAP commands. For Data ONTAP 7-Mode in the 8.1 release family, no configuration change was required to enable SCSI UNMAP.How to enable/disable the feature in Data ONTAP Windows operating systems utilize in-band UNMAP in following versions:.Data ONTAP utilizes SCSI in-band UNMAP in following versions:.What versions of Windows and ONTAP work well with in-band SCSI UNMAP Typically, this is performed by storage arrays due to load on the system, and as such it is possible to not always reclaim all of the expected blocks during an UNMAP operation. As UNMAP is an advisory command, the SCSI specification allows the target the option of responding to the command with a success response without reclaiming all of the blocks in the specified range.The SnapDrive Space Reclaimer feature uses a vendor-specific hole-punching command for deleting space. However, vendor specific out-of-band space reclamation is available for Windows through such applications as SnapDrive for Windows and the Data ONTAP PowerShell Toolkit. Windows 2008 and earlier have no native in-band UNMAP support.SCSI UNMAP command is used as an in-band operation by Windows 2012 and later.T10 Thin provisioning technology, broadly adopted in the current computer industry, uses UNMAP command to achieve improved storage utilization, flexible capacity planning, and non-stop storage provisioning service. UNMAP command is an advisory SCSI command standardized within T10 SCSI command set, which is used to reclaim space from blocks that have been deleted by the host OS, an application, or a virtual machine.
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