Using PowerFlex SRA 1.0.0.1 with PowerFlex 4.0.1 and VMware SRM

Summary: PowerFlex SRA 1.0.0.1 supports PowerFlex 4.0.1 with VMware SRM versions 8.2-8.6. This KB provides the workaround for the one known issue. Issue: The user cannot map Replication Consistency Group target devices to the SRM disaster recovery site using the PowerFlex UI. Devices must be mapped with CLI. ...

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Symptoms

There is no ability to map the target SRM volumes to hosts when initially creating a Replication Consistency Group in the PowerFlex UI. Therefore, any SRM recovery plan operation fails with the following: "One or several volumes not mounted to SDC."

Cause

The PowerFlex UI does not allow mapping of a target volume when creating a Replication Consistency Group (RCG), though documentation indicates it should.

Resolution

Since RCG target volumes cannot be mapped in the UI during initial creation, any target volumes must be mapped using the CLI. Log in to scli on the primary MDM. Then map the target volumes as read_only using the following syntax: 

Usage: scli --map_volume_to_host (--volume_id  | --volume_name ) (--host_id  | --host_name   | --sdc_guid  | --sdc_ip ) [--access_mode ] [--allow_multi_map]
Description: Map a volume to SDC 
Parameters:
    --volume_id                     Volume ID
    --volume_name                 Volume name
    --host_id                       Host ID
    --host_name                   Host name
    --nvme_host_nqn                NVMe Host NQN
    --sdc_guid                    SDC Global Unique Identifier
    --sdc_ip                        SDC IP address
    --access_mode          Mapping access mode. Can be one of the following: read_write (default), read_only, no_access
    --allow_multi_map                   Allow this volume to be mapped to more than one Host

The volumes only must be mapped once. The following is an example of mapping the volume read-only to a host, but also allowing it to be mapped to other hosts: 

scli --map_volume_to_host --volume_name SRM-KB --sdc_guid FE5E4FFA-79F0-4EFD-8A5F-29A72DE83D86 --access_mode read_only --allow_multi_map 

Be sure to map the volumes to all hosts at the SRM recovery site.

However, when additional pairs are added to the RCG, whether through manual or auto provisioning, the PowerFlex UI permits mapping as shown here:

 

It is only the initial pair that cannot be mapped. Alternatively, the user can create an empty RCG in the CLI (the UI does not permit creation of an empty RCG) and then add all pairs and mappings in the UI. The CLI to add an empty RCG is:

[root@dsib2191 ~]# scli --add_replication_consistency_group --destination_system_name London_PF --rpo 60 --replication_consistency_group_name SRM_Test_2 --protection_domain_name pd1 --remote_protection_domain_name pd1
Successfully created the Replication Consistency Group SRM_Test_2. Object ID 8b69a2ff00000001

Affected Products

PowerFlex Appliance, PowerFlex custom node
Article Properties
Article Number: 000207227
Article Type: Solution
Last Modified: 13 Feb 2025
Version:  4
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