AppSync: AppSync not sending a REST API command to forget the logical-unit resulting errors in VPLEX
Summary: During the appsync unmount operation appsync supposed to send a REST API command to forget the logical-unit in VPLEX. But it's not sending the same for which logical-units got unreachable in VPLEX and errors are shown in VPLEX GUI. ...
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Symptoms
Customer will see below errors in VPLEX GUI:
At the same time frame will see AppSync service plan and unmount phase is success.
In server log, we wont see AppSync sending the below API to forget the logical unit in VPLEX
<Date & Time> executeRequest: executing POST: POST https://<VPLX Server IP/Name>/vplex/logical-unit+forget HTTP/1.1
<Date & Time> executeRequest: Response Status Line: HTTP/1.1 200 OK
But will see AppSync claiming that it completed the operation to forget all logical units from VPLEX
<Date & Time> INFO [EJB default - 5] [com.emc.archway.service.eventservice.EventServiceBean] [AppSync Server Name] [] 5e534c36-54c1-4874-921a-5a9fbb98eeed->>> EVENT [VPLEX_000052]: Completed operation on the VPLEX cluster <VPLEX ID> to forget all logical units which were unmounted.(METADATA: TYPE-INFO, TIME-2021-06-03 04:06:42.450+0200NATIVETIME-<Date & Time> .450+0200, HOST-EMCAppSync, PHASE-Create 1st gen copy, THREAD=EJB default - 5, USER-null, CATEGORY-GENERIC, SESSIONID-null)
At the same time frame will see AppSync service plan and unmount phase is success.
In server log, we wont see AppSync sending the below API to forget the logical unit in VPLEX
<Date & Time> executeRequest: executing POST: POST https://<VPLX Server IP/Name>/vplex/logical-unit+forget HTTP/1.1
<Date & Time> executeRequest: Response Status Line: HTTP/1.1 200 OK
But will see AppSync claiming that it completed the operation to forget all logical units from VPLEX
<Date & Time> INFO [EJB default - 5] [com.emc.archway.service.eventservice.EventServiceBean] [AppSync Server Name] [] 5e534c36-54c1-4874-921a-5a9fbb98eeed->>> EVENT [VPLEX_000052]: Completed operation on the VPLEX cluster <VPLEX ID> to forget all logical units which were unmounted.(METADATA: TYPE-INFO, TIME-2021-06-03 04:06:42.450+0200NATIVETIME-<Date & Time> .450+0200, HOST-EMCAppSync, PHASE-Create 1st gen copy, THREAD=EJB default - 5, USER-null, CATEGORY-GENERIC, SESSIONID-null)
Cause
In AppSync 4.2 due to a Code Bug AppSync not sending the REST API to forget all logical unit if not getting appropriate storage volume details from get-storage-volume-info call on which the forget logical-unit request depends.
Resolution
A hotfix exist to address this issue. Call in support quoting this KB article to obtain the hotfix.
Products
AppSyncArticle Properties
Article Number: 000189275
Article Type: Solution
Last Modified: 03 Nov 2021
Version: 3
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