User guide

Recovery point objective (RPO). The acceptable amount of data loss measured in time. The recovery point objective
is the point in time to which you must recover data as defined by your organization.
Recovery time objective (RTO). Recovery time objective (RTO). The maximum tolerable length of time that a
computer, system, network, or application can typically be down (until system boot start) after a failure or disaster
occurs. The RTO is a function of the extent to which the interruption disrupts normal operations and the amount of
revenue lost by unit of time as a result of the disaster.
Red Hat Enterprise Linux (RHEL). A Linux-based operating system produced by Red Hat and targeted toward the
commercial market, including mainframes.
replication agent. Replication agents carry out many of the tasks associated with replication, including creating
copies of schema and data, detecting updates at the Publisher or Subscriber, and propagating changes between
servers. By default, replication agents run under Microsoft SQL Server Agent job steps.
replication client. This software package installs on every source server that the user wishes to include in a VSR
solution. It acts as the main point of communication between the customer's server and the VSR Management Server.
replication ensemble. The VSR component that holds all of the servers used in a VSRC installation to replicate
customer production data. You can have multiple Replication Ensembles within a VSR POD.
replication server. The server being replicated by the IBM SmartCloud VSR service.
Reserved Resource Virtual Machine service level. The fastest recovery service for critical systems. Though similar
to the Shared Resource Virtual Machine service level in most respects, its RTO is typically less than 15 minutes.
Customers can subscribe to this service level only as an upgrade from the Shared Resource Virtual Machine service
level. The gold server icon in the tree view indicates a server protected at the Reserved Resource Virtual Machine
service level.
RHEL. See Red Hat Enterprise Linux (RHEL).
role. A server role is a set of software programs that, when they are installed and properly configured, lets a
computer perform a specific function for multiple users or other computers within a network. Generally, roles share
the following characteristics:
v They describe the primary function, purpose, or use of a computer. A specific computer can be dedicated to
perform a single role that is heavily used in the enterprise, or may perform multiple roles if each role is only
lightly used in the enterprise.
v They provide users throughout an organization access to resources managed by other computers, such as Web
sites, printers, or files that are stored on different computers.
v They typically include their own databases that can queue user or computer requests, or record information about
network users and computers that relates to the role. For example, Active Directory Domain Services includes a
database for storing the names and hierarchical relationships of all computers in a network.
v As soon as they are properly installed and configured, roles function automatically. This allows the computers on
which they are installed to perform prescribed tasks with limited user commands or supervision.
See also:
v User
v Customer VSR Administrator
v IBM VSR Administrator
role services. Software programs that provide the functionality of a role. When you install a role, you can choose
which role services the role provides for other users and computers in your enterprise. Some roles, such as DNS
Server, have only a single function, and therefore do not have available role services. Other roles, such as Remote
Desktop Services, have several role services that can be installed, depending on the remote computing needs of your
enterprise. You can consider a role as a grouping of closely related, complementary role services, for which, most of
the time, installing the role means installing one or more of its role services.
RPO. See Recovery point objective (RPO).
RTO. See Recovery time objective (RTO).
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