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Status Submitted
Workspace AIX
Created by Guest
Created on Nov 5, 2024

RELATED IDEAS

Correct the way AIX NFS4 client constructs its clientID, so that it is persistent across LPMs, as it is required to be.

Current behavior/design

Currently, the clientID generated by AIX NFS4 client can possibly change after an LPM. This is because of the current design.

In the current design, NFS4 client uses the nodeID as a part of the clientID, and the nodeID can change after an LPM. The new clientID can possibly conflict with one generated by an old LPAR in the frame.

Expected Enhancement

Use a different algorithm for generating the clientID, so that it remains persistent across LPMs (and across reboots as well).

Benefit

The current behavior violates the RFC requirement that clientID should remain unchanged on reboots & reincarnations of the client. So modifying the current design would help keep us in line with RFC.

Also, the current design could elicit an unexpected "NFS4ERR_CLID_INUSE" error from the server if the server still has that clientID saved. Or it could lead to other types of server misbehavior, due to the collision. This is what had happened at a customer (Enterprise Holdings Inc.) site, and it resulted in data availability issues . There could be more chaos depending on the server (if it discards all the state associated with the other client). We would avoid these data availability, and possible data inconsistency issues.

Idea priority Urgent
  • Guest
    Reply
    |     Nov 14, 2024

    Please fix this bug asap.
    We have already created many tickets in the last few years but have not received a solution except to reboot the affected lpars.
     

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