IBM Enterprise Storage Server 2105 E10, Introduction And Planning Manual

Page: 66 / 156

Services function. The default setting for ESS is disable ESS Web Copy service
Interface for S/390 hosts. If you are interested in using the Web Copy service
Interface, you must identify the information in “Appendix B. Communication
Resources (ESS Web Copy Services) work sheet” on page 89.
Note: You can invoke Extended Remote Copy (XRC), Concurrent Copy, PPRC,
and FlashCopy for IBM System/390 hosts with the IBM/System390 command
functions.
Open Systems
ESS Web Copy Services is a Java-based client server application. The application
consists of one primary server component, an optional backup server component,
and one or more client components. The backup server refers to a server that can
be started as a primary server in the event that the first primary server fails.
The implementation of these application components in a collection of ESS clusters
forms an ESS Web Copy Services server group. This implementation allows users
to define, execute and view the status of Copy Services functions and tasks in, and
between the server group clusters. For example, the ESS Web Copy Services
application allows a user to:
v
Initiate a FlashCopy task for two volumes in one ESS cluster
v
Establish PPRC relationships for volumes in two ESS clusters
v
Execute predefined PPRC and FlashCopy tasks
Each ESS cluster within a server group runs the ESS Web Copy Services client
component. The user designates one of the ESS clusters in a server group to also
run the primary server component, and optionally designates another ESS cluster to
run the backup server component. If the server group consists of ESS clusters
installed at different locations, then the primary and backup servers should be
assigned to ESS clusters that are remote from each other.
The ESS clusters that are part of a Copy Services (CS) server group use the
TCP/IP network to communicate. You can configure two ESS Copy Services
servers to a group. Each ESS Copy Services server group manages four clusters
and a maximum of 2048 volumes. You have identified the assignment of the TCP/IP
addresses within the Communication work sheet given to the CE during ESS
installation. You enter this information on the Copy Services work sheet. See
“Chapter 4. Planning for communication” on page 65 for the procedures for filling in
this work sheet. (In order for this communication to work well, some type of name
resolution has to be running in the users network.) IBM recommends using a
domain name server (DNS) for name resolution. DNS resolves the names of the
participating ESS clusters and enables ESS Web Copy Services to operate
correctly. This includes allowing the open system hosts to run CLI for Copy Services
automation. When DNS is not available, the IBM SSR can configure each ESS to
provide name resolution.
Users access the ESS Web Copy Services interface from the ESS Specialist
Introduction panel using an ESSNet console or a Web browser at a local
workstation. Access to the ESS Web Copy Services from a browser window
normally connects to the primary server, which has the overall view and control of
the server group Copy Services configuration. The backup server provides similar
view and control for handling when the primary server is unavailable. A user can
access the backup server if the primary server is unavailable. A user must manually
reset the Web Copy Services Function to connect to the backup server when the
primary server is unavailable as in Disaster Recovery actions.
42
ESS Introduction and Planning