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Virtual Disk Provision Policy
The document outlines virtual disk provisioning policies in VMware, detailing three types: thick provision lazy zeroed, thick provision eager zeroed, and thin provision. Thick provisioning allocates space in advance with poor space reclamation, while thin provisioning allocates space on demand and offers better space reclamation. The document offers considerations for performance and monitoring for each provisioning type.
Virtual Disk Provision Policy
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- 2. Virtual Disk Provisioning Policies ThickProvision Lazy Zeroed Thick Provision Eager Zeroed Thin Provision
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- 4. Comparison Thick Provisioning SpaceAllocation- InAdvance Space Usage Rate – Poor Space Reclamation - No Performance -Very Good Monitor – Seldom Spend - In Advance Thin Provisioning Space Allocation - On Demand Space Usage Rate - Good Space Reclamation –Yes Performance – Fair to Good Monitor – Often Spend – On Demand
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- 6. Provisioning types • ThickLazy Zeroed • Thick Eager Zeroed • Thin
- 7. Thick Provision LazyZeroed Createsa virtual disk in a default thick format. Space required for the virtual disk is allocated when the virtual disk is created. Data remaining on the physical device is not erased during creation, but is zeroed out on demand at a later time on first write from the virtual machine. Using the thick provision lazy zeroed format does not zero out or eliminate the possibility of recovering deleted files or restoring old data that might be present on this allocated space.You cannot convert a thick provision lazy zeroed disk to a thin disk
- 8. Thick Provision EagerZeroed Atype of thick virtual disk that supports clustering features such as FaultTolerance. Space required for the virtual disk is allocated at creation time. In contrast to the thick provision lazy zeroed format, the data remaining on the physical device is zeroed out when the virtual disk is created. It might take much longer to create disks in this format than to create other types of disks
- 9. Thin Provision Usethis format to save storage space. For the thin disk, you provision as much datastore space as the disk would require based on the value that you enter for the disk size. However, the thin disk starts small and at first, uses only as much datastore space as the disk needs for its initial operations. Note: If a virtual disk supports clustering solutions such as FaultTolerance, do not make the disk thin.
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- 14. Tips: You can useStorage vMotion to transform virtual disks from one format to another