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198 DS6000 Series: Concepts and Architecture
and then follows the prompts. If using a GUI, the user navigates to the CD root directory
and clicks on the relevant setup executable.
3. The DS CLI is then installed. The default install directory will be:
– /opt/ibm/dscli - for all forms of UNIX
– C:\Program Files\IBM\dscli - for all forms of Windows
– SYS:\dscli - for Novell Netware
10.5 Command flow
To understand migration or co-existence considerations, it is important to understand the flow
of commands in both the ESS CLI and the DS CLI.
ESS Copy Services command flow using ESS Copy Services CLI
When using the ESS Copy Services CLI with an ESS 800, all commands are issued to a
Copy Services Server, present on one cluster of the ESS. Interaction with this server is via
either a Web Copy Services GUI interface, or via a CLI interface. To use the CLI, the open
systems host needs to have ESS Copy Services CLI software installed. An ESS CLI script will
issue commands to the CLI software, which then sends them to the primary Copy Services
Server (known as Server A). For backup, a second server can also be defined (known as
Server B).
Figure 10-1 on page 199 shows the flow of commands from host to server. When the Copy
Services (CS) server receives a command, it determines whether the volumes involved are
owned by cluster 1 or cluster 2. This is based on LSS membership (even numbered LSSs
belong to cluster 1, odd numbered LSSs belong to cluster 2). The CS server issues the
command to the client software on the correct cluster and then reports success or failure back
to the CLI software on the open systems host.