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Block Virtualization Process
Block virtualization technology enables dynamic allocation of storage resources in storage pools. Using this technology shortens the response time for data reads/writes in the storage pools and the time needed to reconstruct data on failed disks.
Figure 3-1 Block virtualization process
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- The storage system groups disks into multiple disk domains. A disk domain may consist of the same or different types of disks. The disk types of a disk domain determine the storage tiers of storage pools.
- The storage system divides the storage media in storage tiers into fixed-size CKs.
- CKs in a storage tier form CKGs and hot spare space based on the RAID policy and hot spare space policy configured on DeviceManager.
- The storage system divides CKGs into extents based on the data migration granularity configured on DeviceManager. The extent is the smallest unit of a thick LUN.
- When a user creates a thin LUN, the storage system divides extents into grains and maps the grains to the thin LUN for more precise management over the storage space.