Figure 23 Tpv Capacity Optimization - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function
Operations Optimization (Virtualization)
TPV Capacity Optimization
TPV capacity optimization can increase the unallocated areas in a pool (TPP) by changing the physical areas
where 0 is allocated for all of the data to unallocated areas. This improves functional efficiency.
Once an area is physically allocated to a TPV, the area is never automatically released.
If operations are performed when all of the areas are physically allocated, the used areas that are recognized by
a server and the areas that are actually allocated might have different sizes.
The following operations are examples of operations that create allocated physical areas with sequential data to
which only 0 is allocated:
Restoration of data for RAW image backup
•
RAID Migration from Standard volumes to TPVs
•
Creation of a file system in which writing is performed to the entire area
•
The TPV capacity optimization function belongs to Thin Provisioning. This function can be started after a target
TPV is selected via ETERNUS Web GUI or ETERNUS CLI. This function is also available when the RAID Migration
destination is a TPP.
TPV capacity optimization reads and checks the data in each allocated area for the Thin Provisioning function.
This function releases the allocated physical areas to unallocated areas if data that contains all zeros is detected.

Figure 23 TPV Capacity Optimization

Before the process
After the process
TPV capacity optimization may not be available when other functions are being used in the device or the target
volume.
For details on the functions that can be executed simultaneously, refer to
Available for Simultaneous Executions" (page
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
Check
TPV 0
LBA0
Release
TPV
Copyright 2019 FUJITSU LIMITED
0
Release Release
*1: The allocated capacity varies depending on the TPP capacity.
: Physically allocated area (data other than ALL0 data)
: Physically allocated area (ALL0 data)
: Unallocated area
146).
41
0 0
Release
21MB (*1)
"Combinations of Functions That Are
P3AM-8992-14ENZ0