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See matching posts in thread - FS5200 Vmware unmap reclaim spa...
See matching posts in thread - Enabling/disabling SCSI UNMAP d...
See matching posts in thread - Flashsystem host unmap not work...
IBM DS8880 now supports VMware SCSI UNMAP primitive. With this, storage space is returned to IBM DS8880 for another use when space is released from vSphere layer. Using this VMware's VAAI SCSI UNMAP primitive, the VMware host notifies the storage device about freed space on a thin-provisioned LUN by sending a SCSI UNMAP command
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Storage Space Unmap Support in AIX Overview: Thin Provisioning is a technology employed by storage products for optimized resource utilization
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Now with the DS8000 R8.2.3 release this June (bundles 88.23 and higher), the DS8880 also supports the VMware SCSI UNMAP option, along with the VAAI and VASA APIs which we had been supporting before
【ハイパーパイザー層でのレクラメーション】 VMwareはESXi5.0以降でUNMAPが使えるようになりました。 ESXi5.0では、自動でUNMAPが有効になっていましたがStorage vMotion時のパフォーマンス等の問題からESX5.0 u1ではUNMAPは自動では行われない設定になりました。...ESXi5.5以降では、これに変わり"esxcli storage vmfs unmap"というコマンドが提供されるようになりました。