Figure 23 Tpv/Ftv Capacity Optimization - Fujitsu ETERNUS DX100 S4 Design Manual

2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
TPV/FTV Capacity Optimization
TPV/FTV capacity optimization can increase the unallocated areas in a pool (TPP/FTRP) by chang-
ing 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/FTV, 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 se-
quential data to which only 0 is allocated:
Restoration of data for RAW image backup
•
• RAID Migration from Standard volumes to TPVs/FTVs
• Creation of a file system in which writing is performed to the entire area
The TPV/FTV capacity optimization function belongs to Thin Provisioning. This function can be star-
ted after a target TPV/FTV is selected via ETERNUS Web GUI or ETERNUS CLI. This function is also
available when the RAID Migration destination is a TPP or an FTRP.
TPV/FTV capacity optimization reads and checks the data in each allocated area for the Thin Provi-
sioning function. This function releases the allocated physical areas to unallocated areas if data that
contains all zeros is detected.

Figure 23 TPV/FTV Capacity Optimization

Before the process
After the process
TPV/FTV capacity optimization may not be available when other functions are being used in the de-
vice or the target volume.
For details on the functions that can be executed simultaneously, refer to
tions That Are Available for Simultaneous Executions" (page
For details on the procedure of TPV/FTV capacity optimization, refer to "ETERNUS Web GUI Us-
er's Guide".
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Check
TPV / FTV 0
LBA0
Release
TPV / FTV
*1: The allocated capacity varies depending on the TPP/FTRP capacity.
Copyright 2023 Fujitsu Limited
0
Release
: Physically allocated area (data other than ALL0 data)
: Physically allocated area (ALL0 data)
: Unallocated area
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