Thin Provisioning

Thin Provisioning has the following features:

  • Storage Capacity Virtualization

    The physical storage capacity can be reduced by allocating the virtual drives to a server, which allows efficient use of the storage capacity. The volumes more than the capacity of all the installed drives can be allocated by setting the capacity required for virtual volumes in the future.

  • TPV Balancing

    I/O access to the virtual volume can be distributed among the RAID groups in a pool by relocating and balancing the physical areas allocated to the virtual volume.

  • TPV/FTV Capacity Optimization (Zero Reclamation)

    Data in physically allocated areas are checked in blocks and unnecessary areas (areas where 0 is allocated to all of the data in each block) are released to unallocated areas.

Caution

If the Thin Provisioning function is used, the drives must be installed as follows for the maximum pool capacity. The drive type and capacity are not restricted.

Table: Maximum Pool Capacity and Required Number of Drives

Model

Are the drives installed in the CE slots?

Maximum pool capacity

Required number of installed drives

Required drive installation slot

Enclosure

Slot location

DX600 S6

Yes

Up to 1PB

2

CE#0

Slot#0 and Slot#1

1.5PB or more

4

CE#0

Slot#0 to Slot#3

No (*1)

Up to 1PB

2

DE#10

Slot#0 and Slot#1

1.5PB or more

4

DE#10

Slot#0 to Slot#3

DX900 S6

DX8900 S6

Yes

Up to 1PB

2 / 4 (*2)

CE#0

Slot#0 and Slot#1

2PB

4

CE#0

Slot#0 to Slot#3

4PB

8

CE#0

Slot#0 to Slot#3

DE#08

Slot#0 to Slot#3

8PB or more

16

CE#0

Slot#0 to Slot#7

DE#08

Slot#0 to Slot#7

No (*1)

Up to 1PB

2 / 4 (*3)

DE#04

Slot#0 and Slot#1

2PB

4

DE#04

Slot#0 to Slot#3

4PB

8

DE#04

Slot#0 to Slot#3

DE#08

Slot#0 to Slot#3

8PB or more

16

DE#04

Slot#0 to Slot#7

DE#08

Slot#0 to Slot#7

*1

When only SAS drives are installed in the drive enclosure.

*2

The required number of drives for the ETERNUS DX900 S6 is two.

The required number of drives for the ETERNUS DX8900 S6 is four. Two of those must be installed in the required drive installation slot. The remaining two can be installed in any controller enclosure (CE) or drive enclosure (DE) slot.

*3

The required number of drives for the ETERNUS DX900 S6 is two.

The required number of drives for the ETERNUS DX8900 S6 is four. Two of those must be installed in the required drive installation slot. The remaining two can be installed in any drive enclosure (DE) slot.