Linux with zSeries and ESS: Essentials

Chapter 6. ESS Copy Services and Linux 71

Figure 6-8 Incremental FlashCopy

When FlashCopy is established for a large number of volumes, there is a finite amount of

time between the first and last establish, so that copies may not be created at a consistent

point-in-time. FlashCopy V2 introduces a

Consistency Croup

function, which can be used to

create a consistent point-in-time copy across multiple volumes.

6.5 ESS Copy Services Web User Interface

The ESS Copy Services that runs in the ESS provides a Web interface that can be used to

invoke and manage the ESS copy functions. First, one ESS has to be defined as the ESS

Copy Services Server (CSS), and this will hold all ESS Copy Services related information.

Optionally, there can be a second ESS defined to be the backup ESS Copy Services Server.

The recommendation is to define the Copy Services server at the remote (recovery) site and

the backup CSS at the primary (application) site. Setting up the CSS in the ESS is done by an

IBM Service Support Representative.

To access the Copy Services Web User Interface (WUI) you first open the ESS Welcome

Screen, discussed earlier in 4.3.3, “ESS Specialist” on page 44

,

and shown in

Figure 6-9.

FlashCopy initiated from volA to

volB, change recording starts on

both volumes.

Background copy task copies data

from volA to volB.

Time

volA volB

volA volB

volA volB

volA volB

Once FlashCopy is established,

independent updates can proceed

to volA and to volB.

Incremental FlashCopy initiated

from volA to volB.

Background copy task copies

changed tracks from volA to volB.

Change recording reset to track

new changes (ready for the next

incremental FlashCopy request).

72 Linux with zSeries and ESS - Essentials

Figure 6-9 ESS Welcome screen

You then select Copy Services, which will connect your browser to the ESS that is specified

as the Copy Services server. The main menu of the ESS Copy Services Web User Interface

will be displayed (refer Figure 6-10).

Figure 6-10 Main menu ESS Copy Services Web User Interface

Chapter 6. ESS Copy Services and Linux 73

From the Copy Services main menu, you can access all ESS Copy Services panels by

selecting one of the buttons on the left hand side. We will briefly look at each of these. For

further details please refer to

IBM TotalStorage Enterprise Storage Server Web Interface

User’s Guide,

SC26-7448, and

Implementing ESS Copy Services with IBM eServer zSeries,

SG24-5680.

The Volumes panel

The Volumes panel is shown in Figure 6-11. From this panel you can:

򐂰 Receive information and the status of volumes defined in a logical subsystem (LSS) of the

ESS

򐂰 Select source and target volumes for a PPRC or FlashCopy task

򐂰 Filter the output of the volume display to a selected range

򐂰 Search for a specific volume based on its unique volume ID

򐂰 Establish, terminate, and suspend PPRC copy pairs and optionally save the task

򐂰 Establish and withdraw FlashCopy pairs and optionally save the task

򐂰 Enter the multiple selection mode for PPRC and FlashCopy

Figure 6-11 Volumes panel

The Logical Subsystems Panel

The Logical Subsystems panel is shown in Figure 6-12. This panel displays the ESSs and the

logical subsystems within the ESS storage network; the storage network includes all ESSs

that are configured to use the same ESS Copy Services Server. From the Logical

Subsystems panel you can:

򐂰 View all ESSs within the storage network

򐂰 View all logical subsystems (LSSs) within the storage network

򐂰 Get information about a logical subsystem and its status

򐂰 View and modify the copy properties of a logical subsystem

򐂰 Filter the output of a selected range

򐂰 Search for a specific logical subsystem based on its unique address

򐂰 Establish, terminate, and suspend PPRC copy pairs, and optionally save the task

74 Linux with zSeries and ESS - Essentials

򐂰 Perform operations on consistency groups

Figure 6-12 Logical Subsystems panel

The Paths panel

A path is used to send data between the primary and secondary PPRC pairs. The physical

path consists of the ESCON connection between two ESSs, while a logical path describes

the connection of the PPRC source and targets. Please note that before you can create

PPRC copy pair relationships, you must use the Paths panel to establish logical paths

between the source and target LSSs. The Paths panel is shown in Figure 6-13. From this

panel you can:

򐂰 Establish PPRC paths

򐂰 Remove PPRC paths

򐂰 Create a PPRC consistency group

򐂰 View information about paths