Hitachi MK-97DF8018-00 User Manual
Page 48
6–6
Using SnapShot
Hitachi Simple Modular Storage Copy-on-Write SnapShot User’s Guide
Use the V-VOL for Tape Backup, Testing, Reports, Etc.
Your snapshot image (V-VOL) can be used to fulfill a number of data
management tasks performed on a secondary server. These management
tasks include backing up production data to tape, using the data to develop
or test an application, generating reports, populating a data warehouse, and
so on.
Whichever task you are performing, the process for preparing and making
your data available is the same. The following process can be performed
using the Navigator 2 GUI or CLI, in combination with an operating system
scheduler. The process should be performed during non-peak hours for the
host application.
To use the V-VOL for secondary functions
1. Un-mount the V-VOL. This is only required if the V-VOL is currently being
used by secondary server.
2. Resync the pair before stopping or quiescing the host application. This
is done to minimize the down time of the production application.
- Navigator 2 GUI users, please see the resync pair instruction in
.
- Advanced users using CLI, please see the resync pair instruction in
Updating SnapShot Logical Unit on page A-6
.
•
3. When pair status becomes “Paired”, shut down or quiece (quiet) the
production application, if possible.
4. Split the pair. Doing this insures that the backup will contain the latest
mirror image of the P-VOL.
- Navigator 2 GUI users, please see the split pair instruction in
.
- Advanced users using CLI, please see the split pair instruction in
Updating SnapShot Logical Unit on page A-6
.
5. Un-quiesce or start up the production application so that it is back in
normal operation mode.
6. Mount the S-VOL (V-VOL) on another server.
7. Run the backup program using the snapshot image (V-VOL).
•
NOTE: Some applications can continue to run during a backup operation,
while others must be shut down. For those that stay running (placed in
backup mode or quiesced rather than shut down), there may be a
performance slowdown on the P-VOL.
NOTE: When performing read operations against the snapshot image (V-
VOL), you are effectively reading from the P-VOL. This extra I/O on the P-
VOL affects the performance.