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Data protection management
Data Protection management ensures that data is protected and remains available.
Understanding SRDF groups
SRDF groups provide a collective data transfer path linking volumes of two separate storage systems. These communication and transfer paths are used to synchronize data between the R1 and R2 volume pairs that are associated with the SRDF group. At least one physical connection must exist between the two storage systems within the fabric topology.
Create SRDF groups
SRDF groups provide a collective data transfer path linking volumes of two separate storage systems.
Manage remote replication sessions
Unisphere supports the monitoring and management of SRDF replication on storage groups directly without having to map to a device group.
Set the SRDF GCM flag
SRDF groups provide a collective data transfer path linking volumes of two separate storage systems.

Set the SRDF GCM flag

SRDF groups provide a collective data transfer path linking volumes of two separate storage systems.

Prerequisites

See Roles and associated permissions to determine the user roles that can perform this task.

About this task

The Geometry Compatible Mode (GCM) parameter modifies how a storage system manages the size of a volume. When the GCM attribute is set, the volume is treated as 0.5 a cylinder smaller than its true configured size.

Steps

Select the storage system.
Select Storage > Storage Volumes .
Select a storage volume and click Set SRDF GCM:
Click On to set the GCM flag or Off to unset the flag.

NOTE: The only way to unset this flag is to unmap the device which requires an outage at the host which would mean losing access to volumes.
Click OK.

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