Dell Unity: Refreshing a replication session with a transfer in progress may lead to a hung task

Summary: Customer may have hang tasks if replication operations are issued for a session with a transfer in progress. (Dell Correctable)

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Symptoms

Background to this event:

  • Customer issuing a replication state change such as Pause, Failover With Sync (SwitchOver), or Failover or Sync to a session with an active transfer in progress
  • This typically is issued in error (without the customer realizing that the session is in active transfer).
  • Alternatively, the session transfer may be very slow or stop responding and the customer may be issuing the command hoping to "see progress"

Subsequent operations attempt fails with the following error message:

Operation failed. Error code: 0x987f
Another replication operation is already in progress. Please try again later. (Error Code:0x987f)

 

Cause

The transfer is progress status is very likely normal but in specific conditions would require investigation (specifically if not updating/last sync time remains in the past)

 

Resolution

Contact Dell Technologies Technical Support or your Authorized Service Partner and quote this Knowledgebase ID.

If the subsequent task was not issued yet, examine the replication status in Unisphere over time and confirm it is progressing properly.

Wait until the sync is complete before issuing any further replication operations.

If the session is not updating over time, it requires Dell Technologies support assistance investigating the issue further (assuming no further obvious faults reported on the array).

 

Additional Information

To verify that the session is active or healthy and in active transfer, double-click session name for its properties in the Unisphere Replication page or issue the following cli command (run at least twice to check on updated status):

UEMCLI Example:

root@(none) spb:/$ uemcli /prot/rep/session show -detail

1:    ID                           = 81604378663_APM00163xxxxxx_0000_8160437xxxx_APM00171xxxxxxx_0000
      Name                         = rep_sess_res_21_res_22_APM00163xxxxx_APM00171xxxxxx
      Session type                 = block
      Synchronization type         = auto
      RPO                          = 1h 00m
      Resource type                = LUN group
      Sync State                   = auto syncing
      Health state                 = OK (5)
      Health details               = "This replication session is operating normally. No action is required."
      Operational status           = Auto Sync Configured (0x8405)
      Source status                = OK
      Destination status           = OK
      Network status               = OK
      Destination type             = remote
      Destination system           = RS_2
      Local role                   = Source
      Source resource              = res_21
      Source SP-A interface        = 10.1.xx.xx
      Source SP-B interface        = 10.1.xx.xx
      Destination resource         = res_22
      Destination SP-A interface   = 10.1.xx.xx
      Destination SP-B interface   = 10.1.xx.xx
      Time of last sync            = 2017-05-05 15:07:17      ==> if last sync time is not progressing , session is hang
      Sync status                  = 55% Complete
      Sync transfer rate           = 18 MB/s
      Sync transfer size remaining = 80436224 (76.7M)        ==> if numbers are not decreasing , session is hang
      Previous transfer rate       = N/A
      Average transfer rate        = N/A

 

Affected Products

Dell EMC Unity Family

Products

Dell EMC Unity Family
Article Properties
Article Number: 000052475
Article Type: Solution
Last Modified: 17 Apr 2026
Version:  5
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