Virtual TapeServer 6.04.05 for NonStop Servers Supplemental Installation Guide

24 | Enabling and Configuring Data Replication
Instant DR and AutoCopy features have distinct advantages that may be specific to
individual sites or requirements. In general, Instant DR should be used if files do not change
much from day to day. AutoCopy is best used if files change often throughout the day. Keep
the following in mind when enabling these features:
Configuring network settings and TCP/IP security
You must configure network settings and TCP/IP security for all VTS locations if you wish to
use Instant DR and AutoCopy. To configure the local system, you must attach a monitor,
keyboard, and mouse to the VTS server. To configure remote systems, you must use a remote-
access application to access those systems, or perform the steps at each site. The IP address,
which will differ for each VTS server, must be configured at the local and remote sites.
Consult your network administrator to determine the gateway and subnet mask to use for
each system.
In addition, you should be familiar with networking concepts to complete the steps in this
section. Obtain the following information before beginning this procedure:
• Root access to the VTS system; see the Virtual TapeServer Configuration Guide for a list
of the default accounts provided on the server
• IP address, subnet mask, and gateway of each VTS server
Instant DR AutoCopy
How often is data copied? In batches Individually, as each virtual
tape is unmounted
When is data transmitted? Synchronized, once or more
per day
As each virtual tape is
unmounted
How is the feature initiated? By policy scheduling or the
Dispatch button on the
Instant DR page in the VTS
web interface
Automatically, virtual tapes
in the pool are monitored
and copied when necessary
At what level are changes
made (implementation
granularity)?
Vault, pool, or virtual tape Pool only
How much data is
transmitted?
Data difference only, which
may reduce data
transmission
Bit-for-bit (1:1) copy
operation
When is bandwidth
consumed?
Per schedule, usually off-
hours
Throughout the day, may
coincide with user activity
How many backup sites are
supported?
Multiple sites, from one site
to many based on setup
Single site, from one site to
another
Is tuning supported? Initiates multiple jobs to
overcome delays
Single job only