Refer to "Create Copy Pair" in the
ETERNUS SF Web Console Guide
for details on the operation procedures.
4.4.6 Executing Snapshot Copy
This is a copy method to execute ETERNUS Disk storage system SnapOPC+.
SnapOPC+ uses the Copy-On-Write method to create a pre-update copy source volume.
Refer to "Perform Advanced Copy" in the
ETERNUS SF Web Console Guide
for details on the operation procedures.
SnapOPC+ can save pre-update data on the copy source volume on a per snap generation (unit of volume replication) basis.
SnapOPC+ is designed in view of its mechanism and features to be used as backups for recovery from software failures such as an
operational error or a software error.
If a copy source volume becomes inaccessible due to any hardware failure, SnapOPC+ session(s) fail making it impossible to read the
data on the copy destination volume.
The snapshot copy (SnapOPC+) is effectively available for:
- Backups of temporary files used for cascade copy to alternate media such as tape.
- Backups of file servers and other data less frequently updated.
Figure 4.3 Snapshot Copy (SnapOPC+) Diagram
Note
ETERNUS DX80 S2/DX90 S2, DX100 S3/DX200 S3, ETERNUS DX200F requires one or more Snap Data Pool Volumes.
4.4.7 Checking Copy Status
This section describes how to check the status of Advanced Copy.
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