VMAX AFA and PowerMax: VDM Cannot Load After DM Panic Due to Blocked Threads When Running Embedded NAS 8.1.15.401 and NFSv4

Summary: The VDM cannot load after a DataMover (DM) panic due to blocked threads. This issue occurs when Embedded NAS (eNAS) is running version 8.1.15.401 with NFSv4.

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Symptoms

The VDM cannot load after a DataMover (DM) panic due to blocked threads. This issue occurs when eNAS is running version 8.1.15.401 with NFSv4.

The following entries are from the Logs:

Aug  8 07:59:57 2022:DART:KERNEL:ERROR:3:Slot 2:::1659959974:ThreadsServicesSupervisor: Service:NFSD Pool:NFSD_v4Daemons BLOCKED for 422 seconds: Server operations may be impacted .
Aug  8 07:59:57 2022:DART:KERNEL:ERROR:3:Slot 2:::1659959974:ThreadsServicesSupervisor: Service:NFSD Pool:NFSD_Exec BLOCKED for 400 seconds: Server operations may be impacted .

 

Cause

  • There is a defect in the NFSv4_ClientList::Clean() code.
  • Upgrading to Cumulative E-Pack 5978.711.711_9699 or 9734 upgrade the eNAS version to 8.1.15.401. This upgrade introduces exposure if a file system is mounted with NFSv4.

 

Resolution

  • For customers running eNAS version 8.1.15.401 (released in Cumulative E-Packs 5978.711.711_9699 and 9734) with NFSv4-mounted file systems, the recommendation is to remount the file system with NFSv3.
  • For customers running eNAS version 8.1.15.401, submit an E-Pack request for eNAS version 8.1.15.402.

 

Affected Products

PowerMax, Symmetrix, VMAX
Article Properties
Article Number: 000202531
Article Type: Solution
Last Modified: 03 سبتمبر 2026
Version:  10
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