![]() The unmap process must be triggered manually: vmkfstools -y /vmfs/volumes/esxi-sparse/ Verify Dead Space Reclamation support with esxcli storage core device vaai status get esxcli storage core device vaai status get -d naa.6589cfc0000006948963c2aa5057083fĭead Space is not automatically reclaimed. This enables an array to reclaim space of a thin-provisioned datastore.ĭead Space Reclamation does only work if your iSCSI extent is a ZVOL created as sparse volume: The UNMAP command enables an ESXi host to inform the storage array that space from a thin provisioned LUN can be reclaimed. When a Virtual Machine on a thin-provisioned LUN is deleted, the storage array does not know that the blocks are unused, so it reports the space still as occupied. MBZERO/s - Current megabytes per second zeroed.Zero_F - Total number of failed ZERO commands.Zero - Total number of ZERO commands offloaded.An eager-zeroed virtual disk was created while the screenshot was taken. This will enable Device mode and all required fields. Verify Write Same operations with esxtop. Press u f f g i o in esxtop. Verify Write Same support with esxcli storage core device vaai status get esxcli storage core device vaai status get -d naa.6589cfc0000006948963c2aa5057083f Write Same is enabled by default on all FreeNAS iSCSI LUNS By using the Write Same primitive, the ESXi host simply tells the storage array how much zeroes it should write. This would significantly shorten the time needed. The ESXi host has to write gigabytes of zeroes to the storage array which takes some time. When an eager-zeroed virtual disk is created, the entire space gets zeroed. MBC_WR/s - Current magabytes per second written.MBC_RD/s - Current megabytes per second read.Clone_F - Total number of failed CXOPY commands.Clone_WR - Total number of writes offloaded.Clone_RD - Total number of reads offloaded.A Virtual Machine was migrated with Storage DRS while the screenshot was taken. Verify XCOPY operations with esxtop. Press u f f g i o in esxtop. Verify XCOPY support with esxcli storage core device vaai status get esxcli storage core device vaai status get -d naa.6589cfc0000006948963c2aa5057083f XCOPY is enabled by default on all FreeNAS iSCSI LUNS This does not waste ESXi Host resources such as CPU cycles, DMA buffers and SCSI commands in the HBA queue. The XCOPY primitive allows to offload these requests to the storage array. Without VAAI clone and Storage vMotion operations are performed by the VMkernel. ATSF - Total number of failed ATS commands. ![]() Verify ATS operations with esxtop. Press u f f g i o in esxtop. Verify ATS support with esxcli storage core device vaai status get esxcli storage core device vaai status get -d naa.6589cfc0000006948963c2aa5057083f A SCSI reservation locks a datastore and prevents all other hosts from doing metadata updates on that datastore.ĪTS is enabled by default on all FreeNAS iSCSI LUNS Thin Provisioning Space Threshold WarningĪtomic Test & Set (ATS / Hardware Accelerated Locking)ĪTS is a storage based locking mechanism to replace SCSI reservations on VMFS volumes when doing metadata updates.Dead Space Reclamation (Delete / UNMAP).Atomic Test & Set (ATS / Hardware Accelerated Locking).FreeNAS 9.3 now fully supports all 7 VAAI (vStorage APIs for Array Integration) block primitives:
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