Virtual TapeServer 6.03.41 Operations and Administration Guide

90 | Using Instant DR
• Specify a single = in any of the fields to specify the same value as the one directly
above that value (previous line, same column). Specify == or * in the pool field to
indicate the same pool as referenced in the source entry, such as /VAULT01/==. You
can specify == for the target name, which indicates to use the same name as the
virtual tape you are synchronizing.
• Instant DR is designed to connect to remote disaster recover sites over a connection
that is much slower than the connection to your NonStop server or the local area
network. It is important to configure Instant DR in a way that maximizes your
bandwidth. It is recommended to use a wildcard for your virtual tape name, such as
ARC*. The target name is the target file name, such as ARCMASTR. Also, you can
reduce the amount of data sent over the connection to the remote site by using a
common target name for all virtual tapes in a pool. Because backup data sets change
little from day to day, only changes are sent to the remote site, thereby minimizing
bandwidth.
• Keep the following in mind regarding the target name: If a new generation of a
backup is done on consecutive days, you might rotate through a group of virtual tapes
for each backup on each day and retain previous versions online for several days. The
virtual tape you want to synchronize would be the one most recently created. Each of
these virtual tapes has been generated from the same backup task such that some of
the data remains the same from day to day, and some have changed. If the virtual
tapes involved are named ABC001, ABC002, ABC003, you can use an arbitrary group
name such as ABCABC to give to the virtual tape on the remote site.
Do this by creating three lines in the jobset. If these virtual tapes are in the same pool,
you only need to specify vault and pool once and use = for these items on the second
and third lines. On each line, specify the source virtual tape name. Specify ABCABC
for target name on the first line and then specify = on the last two lines.
Alternately, you can use the wildcard shortcut by creating a one-line jobset with the
value ABC* for the virtual tape name, assuming ABC* does not identify more virtual
tapes than the ones you are working with. The asterisk is the only wildcard character
accepted and can be used only in the cartridge field. It can appear anywhere in the
name (before, after, or in the middle). It can also appear by itself to designate all
virtual tapes in the pool. If the All Files checkbox is not selected, VTS finds the virtual
tape identified with a wildcard that has most recently been modified. In this case, it
makes sense to specifically identify the target virtual tape name instead of using ==.
If the All Files checkbox is selected, the opposite is true. It is unlikely that you would
want multiple asterisk-identified source files backed up to the same destination
virtual tape name. In this case, use == in the target field.
Also, click DEL for any blank rows in the Job Set section of the page.
11. Click SAVE.