Rerpotect task with vLSR fails with error "Failed to sync data on replica devices. SRA command 'syncOnce' failed"

Products

• VMware Live Recovery

Issue/Introduction

• During a reprotect operation in VMware Site Recovery Manager (SRM) using PowerFlex Storage Replication Adapter (SRA), the reprotect task fails with the error:

Failed to sync data on replica devices. SRA command 'syncOnce' failed. General error, check logs for details.

• Though the reprotect task reports errors, the replicated datastore mounts correctly on the recovery site.

Environment

• VMware Live Site Recovery 9.x
• VMware Site Recovery Manager
• Dell Power Flex Storage

Cause

• When vLSR or SRM initiates the reprotect workflow, it triggers the syncOnce operation through the PowerFlex SRA. the PowerFlex API returns an error indicating that the operation is not supported, which causes the SRA syncOnce command to fail and the reprotect operation to report an error. 
• Below errors will be seen in the SRA logs:

[verbose] 2025-12-30 11:49:18,353 sync_once.py:start_sync_group:78: Commence method 'start_sync_to_group' with args: (<sra_powerflex.api.PowerFlex object at 0x7f5e2bf5b5e0>,) and kwargs {'group_id': '2d642d4400000000'}
[info] 2025-12-30 11:49:18,353 api.py:client:115: access to client
[info] 2025-12-30 11:49:18,353 base_client.py:__init__:88: session initialized!
[verbose] 2025-12-30 11:49:18,354 base_client.py:request:176: POST request (3ba94d84f1bf43e0bb5ec1d591fb5f6e) to https://pflxxxx.xxx.lab.xxx.com/api/instances/ReplicationConsistencyGroup::2d642d4400000000/action/syncNowReplicationConsistencyGroup with body None
[verbose] 2025-12-30 11:49:18,356 base_client.py:request:176: GET request (f5aab910454a4be281e66112aa1080e1) to https://pflxxxx.xxx.lab.xxx.com/api/login with body None
[verbose] 2025-12-30 11:49:18,498 base_client.py:request:182: request (f5aab910454a4be281e66112aa1080e1) completed with code 200
[verbose] 2025-12-30 11:49:18,641 base_client.py:request:182: request (3ba94d84f1bf43e0bb5ec1d591fb5f6e) completed with code 500
[error] 2025-12-30 11:49:18,642 base_client.py:request:196: request (3ba94d84f1bf43e0bb5ec1d591fb5f6e) completed with code 500 and response: b'{"message":"The Replication Consistency Group is in Slim Mode.","httpStatusCode":500,"errorCode":4046}'
[error] 2025-12-30 11:49:18,642 sra_logger.py:log_call_with_args:156: function start_sync_to_group failed with error: "not supported error code"
[verbose] 2025-12-30 11:49:18,642 sync_once.py:start_sync_group:78: Complete method 'start_sync_to_group' with result: None <class NoneType>
[error] 2025-12-30 11:49:18,643 sra_logger.py:log_call_with_args:156: function start_sync_group failed with error: "not supported error code"
[verbose] 2025-12-30 11:49:18,643 sync_once.py:sync_groups:104: Complete method 'start_sync_group' with result: None <class NoneType>
[error] 2025-12-30 11:49:18,643 sra_logger.py:log_call_without_args:137: function sync_groups failed with error: "not supported error code"
[verbose] 2025-12-30 11:49:18,643 sync_base.py:get_result:95: Complete method 'sync_groups'
[error] 2025-12-30 11:49:18,644 sra_logger.py:log_call_without_args:137: function process failed with error: "not supported error code"
[verbose] 2025-12-30 11:49:18,644 executor.py:start:119: Complete method 'process'
[error] 2025-12-30 11:49:18,644 executor.py:start:133: not supported error code
[verbose] 2025-12-30 11:49:18,646 executor.py:log_traceback:37: Traceback (most recent call last):
  File "sra_powerflex/api.py", line 69, in _wrapped_call
  File "sra_powerflex/api.py", line 420, in start_sync_to_group
  File "powerflex_client/clients/replication_consistency_group.py", line 63, in sync_now
  File "powerflex_client/base_client.py", line 200, in request
powerflex_client.client_exceptions.ClientHTTPException: ClientHTTPException (url: https://pflxxxx.xxx.lab.xxx.com/api/instances/ReplicationConsistencyGroup::2d642d4400000000/action/syncNowReplicationConsistencyGroup, status_code: 500, message: The Replication Consistency Group is in Slim Mode., request_body: None, error_code: 4046, details: None

Resolution

Please engage the SRA/Array vendor for further investigation.