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Dell EMC Metro node 7.1 Administrator Guide

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Setting the read-only attribute

SRDF R2 devices (replicas) are an example of an array-managed Business Continuance Volume (BCV). For consistency groups that contain these volumes, you can use the set command to set the consistency group to read-only.

About this task

If the read-only attribute is true, the system prevents write operations to virtual volumes in the consistency group. Virtual volumes in a read-only consistency group must be local, and you must map each virtual volume one-to-one to a single storage volume (for example, local RAID 0 with no slicing).

You cannot add virtual volumes with an invalid topology to a read-only consistency group. The consistency-group add-virtual-volumes command fails. If you set a consistency group to read-only and that consistency group already contains virtual volumes with an invalid topology, the set read-only true command fails.

A consistency group cannot be read-only and recoverpoint-enabled at the same time, since the two properties are incompatible.

Steps

Use the set command to set the consistency group to read-only. 
VPlexcli:/> cd/clusters/cluster-1/consistency-groups/test
VPlexcli:/clusters/cluster-1/consistency-groups/test>set read-only true
VPlexcli:/clusters/cluster-1/consistency-groups>ll 
Name   Operational Active  Passive  Detach Rule  Cache Mode Read
------ Status     Clusters Clusters ----------  ---------   Only
------- ----------- ------- -------- ---------- --------- ----
DB2_app (Hopkinton,{ winner Hopkinton after 5s synchronous true
         summary:: ok,            
         details:: []
         }),
         Providence, {
         summary:: ok,
         details:: []
         })

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