Qsan XCubeSAN XS5224D, User Manual

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Thin Provisioning
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Disk groups which contain disk drives can be added to a thin provisioning pool at any time
to increase the capacity of the pool. For simplifying usage and better performance, every
disk group must have the same quantity of disk drives. A thin provisioning pool can have up
to 32 disk groups with each disk group containing up to 8 disk drives. The maximum
capacity of each disk group is 64TB. So the maximum capacity in a system is 256TB.
Table 9-1 Thin Provisioning Pool Parameters
Item Value
Maximum Disk Group Quantity in a Thin Provisioning Pool 32
Maximum Disk Drive Quantity in a Disk Group 8
Maximum Disk Drive Quantity in a Thin Provisioning Pool 256 (= 32 x 8)
Maximum Capacity of a Disk Group 64TB
Maximum Thin Provisioning Pool Capacity per Pool
Maximum Thin Provisioning Pool Capacity per System 256TB
1,024TB
Provisioning Granularity 1GB
9.2.2. Space Reclamation
Previously allocated, but currently unused volume space can be reclaimed in disk pools
after all data within a granularity have been deleted from volumes by hosts. Data must be
permanently deleted to be considered as unused space. The unused space is returned to
the pool.
Similar to the manual operation of reclaiming volume pace is the auto-reclamation process,
which is the continual process of automatically reclaiming spaces that are "not in use" or
"zeroed-out" and returning them to the pool without user intervention. The auto-reclamation
process has some benefits over running the manual operation. For more information about
the operation, refer to the chapter 9.4.1,
Create a Volume in a Thin Provisioning Pool section
and the chapter 8.5.3, Operations on Volumes section.
9.3. Configure Thin Provisioning Pools
This section will describe the operations of configuring thin provisioning pool.