HCX OSAM does not progress during initial sync

Products

• VMware HCX

Issue/Introduction

• In the HCX Manager UI > Services > Migration > Mobility Groups > Select the Mobility Group > Select the VM, the status does not progress after some considerable time:
  
  
  
• In the source VM, the following logs are being repeated and not progressing on data in the Sentinel logs:
  Windows: C:\ProgramData\VMware\HCX\OSAM\sentinel.log
Linux: /var/log/vmware/hcx/osam/sentinel.log
<timestamp> DEBUG srcID = ###########################, state = 0, chunkToRead = -1, nrChunksInReaderQ = 0
<timestamp> DEBUG chunksToBeAcked= 0, len(resendChunksMap) = 0, nrChunksRetransmitted = 0 nrTotalChunkstransmitted = <Total_Number>
<timestamp> DEBUG nrChunksInHasherQ = 0, nrChunksInTansmitrQ = <Queue_Size>, len(chunkRangeHashMap) = ####
<timestamp> DEBUG srcID = ###########################, state = 0, chunkToRead = -1, nrChunksInReaderQ = 0
  
  
• In the Sentinel appliance, the logs do not show the data being transmitted. The logs are found in /var/log/messages
<timestamp> <Appliance-SGW> sdrd 1935 - - [Notice-sdr-rcm] : [sentinel_id] : Received SYNC_PROGRESS message
<timestamp> <Appliance-SGW> sdrd 1935 - - [Notice-sdr-wdr] : [sentinel_id] : Successfully delivered TRANSMIT_ACKS message with 0 acks
<timestamp> <Appliance-SGW> sdrd 1935 - - [Notice-sdr-rcm] : [sentinel_id] : Received SYNC_PROGRESS message
<timestamp> <Appliance-SGW> sdrd 1935 - - [Notice-sdr-wdr] : [sentinel_id] : Successfully delivered TRANSMIT_ACKS message with 0 acks
  
  
• The following command does not show progression after some minutes
  watch -n 10 'curl -k --cert /common/cs/hm_to_gw.pem --key /common/ks/hm_to_gw.pk8 https://<HCX-IP>:9443/sdr/receivers/<sentinel_id>?_return=control.stats  | python -mjson.tool'
  
  Output:
  

  {
    "control": {
        "stats": {
            "saved": <total transferred>,
            "total": <total size to be transferred>,
            "transmitted": <total transferred?,
            "cpId": ""
        }
    }
}

Cause

This is a known issue, and it is still under investigation.

Resolution

This is a known issue impacting VMware HCX. Please open a support case with Broadcom Support and refer to this KB article.