Virtual Disk Provision Policy
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A virtual disk that occupies the provisioned space in various ways - Check the ppt for more information. 1- What are the types. 2- Comparison 3- Explanation
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Virtual Disk Provision Policy
- 2. Virtual Disk Provisioning Policies Thick Provision Lazy Zeroed Thick Provision Eager Zeroed Thin Provision
- 3. Thick vsThin
- 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
- 6. Provisioning types • Thick Lazy Zeroed • Thick Eager Zeroed • Thin
- 7. Thick Provision LazyZeroed Creates a 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 A type 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 Use this 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.
- 10. Block Allocation
- 13. Comparison
- 14. Tips: You can use Storage vMotion to transform virtual disks from one format to another