OSAM migration for VM fails, with the error stating, 'Final sync failed. Sentinel Error (Sync preprocessing failed. Please collect sentinel logs.)'
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OSAM migration for VM fails, with the error stating, 'Final sync failed. Sentinel Error (Sync preprocessing failed. Please collect sentinel logs.)'

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Article ID: 428173

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Updated On:

Products

VMware HCX

Issue/Introduction

  • Following is the error observed for the failed migration,  'Final sync failed. Sentinel Error (Sync preprocessing failed. Please collect sentinel logs.)'

  • Below is the log snippet from SRG appliance logs: 
    $ less "tmp/Fleet-Appliance-2026-01-23--10_51_22/<ServiceMesh_name>/<ServiceMesh_name>-SRG-I1(HCX-SRG).tar.gz_extracted/var/log/messages.4" | grep VM_name -A 5 -B 5
<Timestamp> <ServiceMesh_name>-SRG-I1 sgwd 1863 - - [Notice-sgwd] : error writing to sentinel <SRG_Appliance_ID>: write tcp <SRG_IP_address>:443-><Guest_VM_IP_address>:56848: write: connection reset by peer
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Received SYNC_PROGRESS message
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Beginning handling for SEND_FAILED request on connection [rcp-127.0.0.1:51472] : &{BaseReqMsg:{MsgName:SEND_FAILED} Payload:{StateChgId:0 ErrNo:10101 ErrDesc:Sync pre-processing failed. Error : Preparing sync item \\?\Volume{<Volume-ID>} failed with error Locking volume \\?\Volume{<Volume-ID>} failed with Access is denied.}}
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Raising sync failed event ....
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : Sent Event [EventSyncComplete] to listener [&{0xc000b84c00}]
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Responding to SEND_FAILED request on connection [rcp-127.0.0.1:51472]
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : Unregistered listener [&{0xc000b84c00}] for Event [EventSentinelConnect]
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : Unregistered listener [&{0xc000b84c00}] for Event [EventAbortSync]
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : Unregistered listener [&{0xc000b84c00}] for Event [EventSyncComplete]
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Received event to exit receiving, syncSuccessful=false, syncAborted=false, sentConnected=false
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Exited receiving, syncSuccessful=false, syncAborted=false, sentConnected=false, sendError=<nil>
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Setting storage has data status to (true)
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-rcm] : [<SRG_Appliance_ID>] : Cleaning up storage .....
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-wdr] : Removing sentinel context for [<SRG_Appliance_ID>] .....
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-wdr] : Removed sentinel context for sentinelId: <SRG_Appliance_ID>
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-wdr] : [<SRG_Appliance_ID>] : Found 0 network connnections
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-wdr] : [<SRG_Appliance_ID>] : Sending stop notification to acks transmisstion routine ....
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-wdr] : [<SRG_Appliance_ID>] : Waiting for all goroutines to exit ....
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Notice-sdr-wdr] : [<SRG_Appliance_ID>] : Disabling replica storage
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Err-sdr-rcm] : [<SRG_Appliance_ID>] : &{10101 Sentinel reported SEND_FAILED with error: Sync pre-processing failed. Error : Preparing sync item \\?\Volume{<Volume-ID>} failed with error Locking volume \\?\Volume{<Volume-ID>} failed with Access is denied.}
<Timestamp> <ServiceMesh_name>-SRG-I1 sdrd 1875 - - [Err-sdr-rcm] : [<SRG_Appliance_ID>] : Transitioning to ERROR state : &{10101 Sentinel reported SEND_FAILED with error: Sync pre-processing failed. Error : Preparing sync item \\?\Volume{<Volume-ID>} failed with error Locking volume \\?\Volume{<Volume-ID>}failed with Access is denied.}

Environment

VMware HCX

Cause

The synchronization process for a Sentinel node fails during the pre-processing phase. The sdrd component is unable to secure a mandatory exclusive lock on the underlying Windows storage volume required for data replication.

Resolution

  • Permission Audit: Inspect the service account permissions on Guest VM. Ensure the account running the service mesh agent has full administrative privileges to lock and manage disk volumes of the Guest VM.

  • Resource Contention: Verify if third-party software (Antivirus, Backup agents, or Disk Utilities) held an exclusive lock on the volume at the time of the incident.

Additional Information

Understanding VMware HCX OS Assisted Migration

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