Symptoms
The AppSync events will show:
2019-04-26 15:29:07.816,Restore copy,xx,UNITY_000047,SRV-appsync,Failed to restore the Unity snapshot AppSyncSnap-20190410_152120:332-287e3583-632b-4947-8ec9-5d0e7571b4b8-VOL_11 with an unexpected response from array uni-local-xxx. Response text: The restore operation cannot be performed because destination of the restore operation is being used by an active sync replication session. Pause the session, and try again. (Error Code:0x716f1011).
The resume may also fail as seen in the AppSync events:
2019-04-26 15:29:10.179,Restore copy,xx,UNITY_000086,SRV-appsync,Failed to perform on demand resume operation on replication session with id: xxxxxxx_APM00-LOCAL_0000_yyyyyyyy_APM00-REMOTE_0000
The AppSync Server log will show the request to pause of the Unity native replication session:
04-26-2019 15:28:00.488 INFO [Thread-458] [com.emc.archway.restclient.RESTClient] [xxx-appsync] [] c6ceac66-df16-4c49-92f5-9feb710c1a62->>> executeRequest: executing POST: POST https://10.UNITY-IP:443/api/instances/replicationSession/
xxxxxxx_APM00-LOCAL_0000_yyyyyyyy_APM00-REMOTE_0000/action/pause HTTP/1.1
The Unity EMCSystemLogFile located in a Unity data collect will show when the session became paused in GMT. Notice it took 33 seconds, which is greater than the 30 seconds AppSync allows.
"2019-04-26T19:28:33.375Z" "spb" "Neo_CEM" "23121" "N/A" "WARN" "14:60772" :: "Replication session rep_sess_res_3_res_2_APM00-LOCAL_APM00-REMOTE has been paused." :: Category=User Component=Health
Cause
AppSync only allowed for 30 seconds for the Unity native replication session to pause.
Resolution
A hotfix exists for AppSync 3.8.0.0 that extends the time period that AppSync will wait for the Unity native replication session to be paused to 30 minutes, with checks every 20 seconds.Refer to the release notes post AppSync 3.8.0.0 to determine if the issue is resolved in releases subsequent to AppSync 3.8.0.0.To obtain the hotfix for AppSync 3.8.0.0 or subsequent releases that do not note this issue as being resolved, open a service request and quote this article.
