Chapter 3 Volume Management
3.7 TPV Management
ETERNUS Web GUI User’s Guide (Settings)
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5 Click the [Done] button to return to the [Volume] screen.
3.7.3 Optimize TPV/FTV Capacity
The optimizing capacity (Zero Reclamation) function releases the physical area when data in the block (*1)
that is allocated to a TPV or an FTV is filled with zeros.
This function optimizes TPV or FTV capacity.
*1: Volume allocation unit
Volume requirements for optimizing TPV/FTV capacity:
• Volumes for which "Type" is "TPV" or "FTV"
• Volumes without " Readying" status, " Not Ready" status, or " Broken" status
• Volumes that are not undergoing TPV/FTV capacity optimization or volumes that are not reserved for opti-
mization
• Volumes that are not ODX Buffer volumes
• Volumes that are not undergoing RAID migration
• Volumes that are not undergoing TPV balancing
• FTVs that are not undergoing FTRP balancing
• Volumes where the allocation method is not "Thick"
• This function cannot be performed when the storage system status is "Not Ready".
• Do not execute capacity optimization for NAS user volumes, NAS backup volumes, and NAS system vol-
umes.
• The Thin Provisioning function and the Flexible Tier (automatic storage layering) function can be
effectively used by using the Optimize TPV/FTV Capacity function when system configurations or system
environment modifications are performed. Examples of when to use the Optimize TPV/FTV Capacity
function are as follows:
- After the initialization of the OS or the file system (such as writing 0 data to all the volumes) is
complete
- After RAID migration from "Standard" to "TPV" is complete
- After RAID migration from "Standard" to "FTV" is complete
• The progress of the optimizing can be checked with "Optimizing Capacity Progress" on the [Volume
Detail] screen (Basic). Refer to "Volume Detail (Basic)" in "ETERNUS Web GUI User’s Guide (Operation)" for
details.
• The optimizing capacity can be reserved for the source volume of the RAID migration. Refer to "3.9 Start
RAID Migration" (page 301) for details.
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