HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

572 of 739
Stopping, starting, pausing, or resuming mirroring
After a connection is established, you need to be able to control the mirroring. You can
start, stop, pause and resume mirroring. open the Replication Console, and right-click
the connection on the right pane of the Replication Console. Select Mirroring and the
appropriate mirror control.
● Pause or Resume—When pausing a mirror, Storage Mirroring Recover stops
queuing mirror data on the source but maintains a pointer to determine what
information still needs to be mirrored to the target. Therefore, when resuming a
paused mirror, the process continues where it left off.
● Stop—When stopping a mirror, Storage Mirroring Recover stops queuing mirror
data on the source and does not maintain a pointer to determine what information
still needs to be mirrored to the target. Therefore, when starting a mirror that has
been stopped, the process will mirror all of the data contained in the replication set.
● Start—If you select to start a mirror, you will need to make the following two
selections on the Start Mirror dialog box.
● Full Mirror—All files in the replication set will be sent from the source to the
target.
● File differences—Only those files that are different based size or date and
time will be sent from the source to the target. Expand File difference mirror
options compared below to see how the file difference mirror settings work
together, as well as how they work with the global checksum setting on the
Source tab of the Server Properties.
● Send data only if Source is newer than Target—Only those files that
are newer on the source are sent to the target.
Note:
If you are using a database application, do not use the newer option
unless you know for certain you need it. With database applications, it is
critical that all files, not just some of them that might be newer, get
mirrored.
● Use block checksum—For those files flagged as different, the mirror
performs a checksum comparison and only sends those blocks that are
different.
● Calculate Replication Set size prior to mirror—Determines the size of the
replication set prior to starting the mirror. The mirroring status will update the
percentage complete if the replication set size is calculated.
File difference mirror options compared
An X enclosed in parentheses (X) indicates that the global option on the Server