Shadow Copy Destination Disk Capacity Estimation - Fujitsu ETERNUS VSS Hardware Provider 2.1 User Manual

Chapter 3 Preparation
3.2 Shadow Copy Destination Disk Creation
3.2.2

Shadow Copy Destination Disk Capacity Estimation

The disk capacity of the Shadow Copy destination volume to be created varies depending on the
selected disk type.
• For a normal volume
The Shadow Copy destination disk capacity must be the same as that of the source disk.
• For a Snap Data Volume (SDV)
The Shadow Copy destination SDV disk capacity may be lower than that of the source disk.
Source disk
Actual capacity is just
the amount of source
disk updates.
SDV disk capacity is calculated by the amount of the source disk updates for the period when the
requester is using the Shadow Copy destination (*1).
*1: For example, the period is the time from when the requester starts backup to when backup to a tape
device finishes.
Measure the amount of the source disk updates using the "Update Volume Measurement Command
(stxvtestcopy)". Measure the expected amount of updates using the following procedure and decide the
disk capacity.
(1) Start measuring the
amount of updates.
stxvtestcopy start -p 1
Procedure
1
Extract the file downloaded in
2
Extract the "Update Volume Measurement Command".
- For Windows Server 2008/Windows Server 2012
Double-click the extracted package of the "Update Volume Measurement Command"
(setup_testcopy_2008.exe).
- For a Server Core environment
Use the "Update Volume Measurement Command" after installing VSSHP. Do not use the
"Update Volume Measurement Command" package.
Shadow Copy
destination
SDV
(2) Run some
arbitrary update
operations.
(3) Check the amount of
updates.
stxvtestcopy status -p 1
"4.1 New Installation" (page 34)
ETERNUS VSS Hardware Provider 2.1 User's Guide
Copyright 2012 FUJITSU LIMITED
Capacity seen from the server
appears to be the same as that
of the source disk.
(4) Stop measuring the
amount of updates.
stxvtestcopy stop -p 1
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