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 Resolving Cross-vCenter Migration Issues with Large VMs (>30TB)

Credits of this article:

During cross-vCenter migrations, we encountered issues with large VMs (>30TB), resulting in prolonged migration times (days) and frequent failures (every 3rd migration). VMware support provided a workaround to extend the port reservation timeout.

*Workaround Steps:*

Step 1:

 SSH to vCenter and take a backup `vpxd.cfg`: 

cp /etc/vmware-vpx/vpxd.cfg /etc/vmware-vpx/vpxd.cfg.bak
 

Step 2:

  Edit `vpxd.cfg` and add below
```
<vpxd>
 <dvs>
 <PortReserveTimeoutInMin>7200</PortReserveTimeoutInMin>
 </dvs>
</vpxd>
```
 

This extends the port reservation timeout to 5 days (7200 minutes).

1. Restart `vpxd` service: `service-control --restart vmware-vpxd`
2. Retry vMotion for large VMs.
3. Post-migration, revert `vpxd.cfg` to its original state: `cp /etc/vmware-vpx/vpxd.cfg.bak /etc/vmware-vpx/vpxd.cfg`
4. Restart `vpxd` service again.

*Note:*

- This workaround requires vCenter downtime due to the `vpxd` service restart.
- This solution is specifically for large VM migrations (>30TB) and should be reverted post-migration.



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