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How do Volume Groups differ from Dynamic Disk Pools in E-Series storage?

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Applies to

E-Series storage

Answer


The table below shows the differences between Volume Groups and Dynamic disk pools in E-Series storage:

 

Volume Groups Dynamic Disk Pools
RAID Selection Yes RAID 6 only
Segment Size 32/64/128/256/512 KB 128 KB fixed
Disk limitation 30 None
Disk selection Yes No
Volume Growth Yes Yes
Volume Shrink No No
Thin Provisioning No Yes
Disk Drawer loss protection Yes Yes
Disk Selection for volume creation Yes No
Reconstruction speed Slow Fast
Modification Priority Lowest <-->Highest High, Cannot be edited
Hot spare Yes No
Disk Preservation No Yes
Suited IO type Sequential Random

Note: Hot spares are not required for disk pools. For disk pools, a certain amount of capacity is preserved for emergencies like drive failures. The maximum disk preservation is 10 disks (equivalent capacity is reserved in each drive in the pool).

Volume Group creation wizard:

  • Volume Groups have an option to select the drives manually or automatically.

 1002438-1.jpg

  • The RAID Level can be selected.

1002438-2.png

Dynamic Disk Pool creation wizard:

  • The drives are auto-selected.

1002438-3.PNG

  • The Create Volume option in Dynamic Disk Pool (DDP) has the option to select thin volume.

1002438-5.JPG

Additional Information

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