Controlling Snap Pairs Within a CG Using SYMCLI

 

Topic

Managing TimeFinder

Selections

Select TimeFinder Action: Managing TimeFinder with Solutions Enabler SYMCLI

Select operating system: Solaris

Select a task: Managing TimeFinder/Snap

Select a task: Controlling snap pairs within a CG

 

 

Contents

·             TimeFinder/Snap control with composite group.. 4

 


 

 

·        TimeFinder/Snap control with composite group

 

Overview

You can create, activate, and control specific snap pairs within a composite group, as well as perform control operations on the entire group.

In the following example, the composite group defined on the host contains a set of snap pairs that spans two Symmetrix arrays. The devices include standard devices and virtual devices. Snap pairs in the composite group are created, activated, and controlled together as a group.

 

This procedure is based on content from the following EMC manual:

·         EMC Solutions Enabler Symmetrix TimeFinder Family Product Guide

 

You can download the guide from EMC Online Support (registration required): https://support.EMC.com

 

 

1. 

Create the composite group

Use the symcg create command to create the composite group. This example names the composite group SNAP:

 

   symcg create SNAP –type regular

 

 

2. 

Add the standard devices to the composite group

Add the source devices to the composite group. The following symcg commands add to the composite group a range of standard devices from each of the two source Symmetrix arrays.

 

symcg -cg SNAP addall dev -range 56:6E -sid 35

symcg -cg SNAP addall dev -range 623:3B -sid 79

 

 

3. 

Add the virtual devices to the composite group

Add the virtual devices to the composite group. The following symcg commands with the –vdev option add to the composite group a range of virtual devices from each of the two source Symmetrix arrays.

 

symcg -cg SNAP addall dev -range EC:104 -sid 35 -vdev

symcg -cg SNAP addall dev -range 598:5B0 -sid 79 -vdev

 

 

4. 

Create the snap pair session

The symsnap create command creates the snap pair session, pairing standards and virtual devices from the composite group and placing each snap pair in the Created state.

 

   symsnap -cg SNAP create

 

'Snap Create' operation execution is in progress for composite group 'SNAP'.
Please wait...

 

'Snap Create' operation successfully executed for composite group 'SNAP'.

 

 

5. 

Activate the snap pair session

The symsnap activate command places each snap pair in the copy-on-first-write state and the target virtual device in the Read/Write (RW) state. The actual copying of data is deferred until the tracks are modified on either a source device or a target device. Any subsequent symsnap control operations must be performed on the entire composite group.

 

   symsnap -cg SNAP activate

 

 

6. 

Terminate the snap pair session

Use the symsnap terminate command to end all snap sessions in the composite group.

 

   symsnap -cg SNAP terminate

 

 

 

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