C. Snapshot Configurable NAS Volume Capacity
(Guideline)
This appendix provides the possible NAS volume capacities (guidelines) for snapshot acquisitions.
The maximum copy capacity varies depending on the copy table size and resolution settings, and the number of
snapshot generations.
●
When a Backup Is Performed Using QuickOPC with OPC Restoration
The values in the table are calculated based on the requirements when the following copy sessions are set
for the NAS user volume.
•
Snapshot
Same requirements as without OPC restoration
•
Backup
Requirements when one QuickOPC session is set for the backup of the NAS user volume and when an OPC
restoration is performed from the copy destination to the copy source for restoring this QuickOPC
Figure 193
Operational Configuration (When a Backup Is Performed Using QuickOPC with OPC
Restoration)
NAS backup
volume
NAS user volume
NAS volume backup
(QuickOPC)
SDV#255
SDV#1
SDV#0
NAS volume restoration
(OPC)
ETERNUS DX
Snapshots
To set snapshot, calculate the available NAS volume capacity according to the customer's operating
environment and adjust the settings so as not to exceed the upper limit.
For details on how to calculate the copy table size, refer to the "Modify Copy Table Size" section in "ETERNUS
Web GUI User's Guide". This section describes how to calculate the recommended values based on the copy
requirements, the total copy capacity, and the number of sessions. For Snapshots, perform the calculations
as shown below.
•
Copy requirements
Same requirements as without OPC restoration
•
Total copy capacity
Total capacity of NAS volumes in which Snapshot is set
•
Number of sessions
Total number of Snapshot generations to which the schedule is set
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Design Guide
Summary of Contents for ETERNUS DX S5 Series
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