Virtual TapeServer 8.4 Configuration Guide

66 | Virtual TapeServer Configuration Guide
last modified a virtual tape.
l Ownership of virtual tapes is not stored, so there is no way to inform the administrator of
either system of the originator of the virtual tape.
l Remote export jobs push virtual tapes from one system to another. It is your responsibility to
disable the remote export jobs on current primary server (at the production site) and enable
them on the current secondary server when swapping roles. If you do not disable all jobs on
the production site, data may be overwritten.
l Delta differencing is used to determine the content that is exported to remote servers after
the initial export. If you want to disable this feature, thereby transferring entire virtual tapes,
you must edit the configuration file and add this parameter: disable_delta_differencing='YES'.
l The export will fail if a virtual tape with the same name exists on the remote server (in a
different pool).
l If a virtual tape does not reside in a VTL, the remote export will fail if the virtual tape is
locked at the time of the export.
How to configure servers and swap roles
Though there are a variety of reasons to configure your environment for role swapping, there are
two scenarios that dictate the steps you can perform:
l The primary server becomes unavailable and the secondary server must assume production
responsibilities. Eventually, the primary server will resume production responsibilities. This
may be the case if you must take a site offline for maintenance or if you are testing DR
procedures.
l The primary server or site becomes permanently unavailable.
The following procedures provide an overview of the steps you must perform for each scenario. The
primary server is referred to as “Server A” and the secondary server is referred to as “Server B” for
simplicity.
Note Some steps in the following procedures are provided in section of this chapter. However, some
steps are provided in the Quick Start Guide and online help. It is recommended that you display
and review this documentation before beginning.
To configure servers and swap roles
1. Configure network settings and TCP/IP security as described in "Configuring network settings"
on page 68. This step includes configuration of the primary server (Server A) and secondary
server (Server B).
2. If you want to send email notifications for completed or failed remote export jobs, configure
SMTP settings as described in the online help.