HP StorageWorks Storage Mirroring Evaluation Guide (T2558-96326, April 2009)

4 - 5
For complete details on all of the statistics, see the Storage Mirroring User’s Guide.
You may notice your Replication Status toggle between Replicating and Ready as it continues
processing the file changes, when your Replication Status stays at Ready, Storage Mirroring is
waiting for additional changes to transmit. After replication is complete, you are ready to continue
with the evaluation.
Verifying the data changes on the target
Now that you have modified some of the files, you want to be sure that the file modifications were
applied correctly.
1. Browse your source and target. Compare the directory structures and the total number of files.
2. Look again at the four files you modified earlier. Verify manually that the changes you made have
been applied to the target copy of the file.
3. Right-click the connection on the right pane of the Management Console and select Verify. You
will see two choices on the Start Verification dialog box.
 Verify Only—This option performs the verification process by comparing the date, time and
size of each file and generates a verification report identifying the files that are not
synchronized.
 Remirror Files to the Target automatically—This options performs the verification process
by the comparison method specified, generates a verification report, and then remirrors those
files from the source to the target that are not synchronized.
4. Select Verify Only and click OK.
NOTE: Many user applications typically save an entire file even though only a portion of the
file may have changed. Therefore, the replication statistics will show the entire file
being transmitted, not just the changed data. To confirm that replication only
transmits the changed segments of files, you must use an application, such as a
database application, or a command, such as the echo command, to save only the
changed portions of a file.
NOTE: Because of the way the Windows Cache Manager handles memory, machines that are
doing minimal or light processing, as you are in this evaluation, may have file operations
that remain in the cache until additional operations flush them out. This may make
Storage Mirroring files on the target appear as if they are not synchronized. When the
Windows Cache Manager releases the operations in the cache on the source, the files will
be updated on the target. To make sure this does not impact your testing, flush the cache
by copying a couple of files from one directory to another and then deleting them.