The time that it took to complete the copy of the FlashCopy data until all
Metro Mirror volumes were synchronous again, depended on the amount
of data transferred. During this time, the Local B would be inconsistent if a
disaster were to have occurred.
Note: Previously, if you created a FlashCopy relationship with the
Preserve Mirror, Required option, by using a Metro Mirror primary
volume as the target of that FlashCopy relationship, and if the status of the
Metro Mirror volume pair was not in a “full duplex” state, the FlashCopy
relationship failed. That restriction is now removed. The Remote Pair
FlashCopy relationship completes successfully with the “Preserve Mirror,
Required” option, even if the status of the Metro Mirror volume pair is
either in a suspended or duplex pending state.
Note: The storage system supports Incremental FlashCopy and Metro Global
Mirror Incremental Resync on the same volume.
Safeguarded Copy
The Safeguarded Copy feature creates safeguarded backups that are not accessible
by the host system and protects these backups from corruption that can occur in
the production environment. You can define a Safeguarded Copy schedule to create
multiple backups on a regular basis, such as hourly or daily. You can also restore a
backup to the source volume or to a different volume. A backup contains the same
metadata as the safeguarded source volume.
Safeguarded Copy can create backups with more frequency and capacity in
comparison to FlashCopy volumes. The creation of safeguarded backups also
impacts performance less than the multiple target volumes that are created by
FlashCopy.
Local Storage Server Remote Storage Server
Local A
Local B
Remote B
FlashCopy
f2c01089
Remote A
full duplex
Establish
FlashCopy
full duplex
Metro Mirror
Figure 11. Remote Pair FlashCopy
Chapter 3. Data management features 71
|
|
|
|
|
|
|
|
|
|
|
To Next Page
Loading...
Need help?
General