Fujitsu ETERNUS DX100 S3 - Figure 23 TPV;FTV Capacity Optimization

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
0 0 0 0
TPV / FTV
LBA0
TPV / FTV
ReleaseReleaseReleaseRelease
: Physically allocated area (data other than ALL0 data)
: Ph
ysically allocated area (ALL0 data)
: Unallocated area
21MB (*1)
*1: The allocated capacity varies depending on the TPP/FTRP capacity.
Before the process
Check
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 "Combinations of Func-
tions That Are Available for Simultaneous Executions
" (page 203).
For details on the procedure of TPV/FTV capacity optimization, refer to "ETERNUS Web GUI Us-
er's Guide".
2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
47
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems
Design Guide (Basic)
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