08 difference between thick and thin provisioning disks

VMware Workstation 和 VMware Server 可以使用這種格式，不過除非第一次輸入 thick 或 thin disk 格式，否則不能在 ESX 或 ESXi 主機上用此種格式啟動虛擬機。

This article provides steps to change the provisioning of a virtual disk from thick to thin, or from thin to thick. The procedure uses the vSphere Client and vCenter Server to perform this task.

If the disk drive is a thin provisioning LUN, the media type of the disk drive appears as “Thin Provisioning Drive”. The system administrator can schedule a storage space consolidation by using the Optimize Drives utility.

Thick provisioning is a type of storage pre-allocation. With thick provisioning, the complete amount of virtual disk storage capacity is pre-allocated on the physical storage when the virtual disk is created. A thick-provisioned virtual disk consumes all

每個虛擬機的資料儲存硬碟都儲存在共享的LUN，而且，根據實驗的選擇將每個虛擬機的資料儲存硬碟配置為 thin-provisioned 或 thick-provisioned。 執行各個 Iometer 測試，每次2分鐘，然後重新啟動每個虛擬機。

Thin provisioning allows virtual disks to allocate and commit storage space on demand. This paper presents a performance study of thin-provisioned disks in a VMware vSphereTM test environment. The test results show that thin disks perform as well as thick

一直以來，到底要選擇哪種虛擬磁碟一直是個二難的問題，雖然 Thin Provisioning 具有儲存空間 動態成長 的優勢，但若真的要比較效能時便比較吃虧，而 Thick Provisioning 雖然儲存效能表現較好，但一直要 一次使用 所有空間也得確缺少彈性，那麼在選擇上應該要怎麼 ...