How to avoid Virtual Network Failures After a Live Migration 'extended-mapin-space' is set to 'on' BUG:17694771

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HOW TO AVOID EXTENDED-MAPIN-SPACE ISSUE

This issue applies to:

Oracle VMSun Software - Generic
Solaris SPARC Operating SystemSPARC

Guest domains  Solaris 10 or Solaris 11 on Oracle VM Server for SPARC (LDOMs 2.1 to 3.1) may experience virtual network failures after a live migration operation if 'extended-mapin-space' is set to 'on'.

You can check if you have set to 'on' the value extended-mapin-space as below

 

# ldm list -l | grep extended-mapin-space=on

In the /var/adm/messages when the issue is happening you can see the following

vnet1: exceeded number of permitted handshake attempts (5) on channel 22

To avoid this issue, set 'extended-mapin-space' to 'off' before executing a live migration.
If the described  issue has already occurred, the system can be restored by executing the following commands to re-establish the virtual network connectivity:
  1. ldm stop <affected guest domain>
  2. ldm unbind <affected guest domain>
  3. ldm set-domain extended-mapin-space=on <affected guest domain>
  4. ldm bind <affected guest domain>
  5. ldm start <affected guest domain>

SPARC Platform with issues
  • Solaris 10 with unbundled product OVM 2.1 through OVM 3.1.0.*
  • Solaris 11 with unbundled product OVM 2.1
  • Solaris 11.0.8.5.0 through 11.1.16.5.0
Important: Solaris 8, Solaris 9, and Solaris x86 are not affected by this issue.

Workaround

This issue is addressed in the following releases:

SPARC Platform
  • Solaris 10 with unbundled OVM patch 150817-02 or later
  • Solaris 11 with unbundled product OVM 3.1.1 (patch 14227416) or later
  • Solaris 11.1.17.5.0 or later
Note: For older releases of OVM (below 3.1) you must upgrade to 3.1 first and then apply patch 150817-02.

For more information feel free to consult the following document (Doc ID 1635520.1)

 

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