Tuesday, June 11, 2013

Standby or unused Uplink is used after rebooting a ESXi 5.0 Update 1 host

Versions AffectedESXi 5.0; ESXi 5.0 Update 1
Diagnostics.py sequential write performance is poor 
 and esxtop with n switch shows that 1Gbps network is used instead of 
10 Gbps.
It is due to vmware issues explained on these  KBs on ESXi 5.0 update 1:
Workaround I: Remove 1Gbps from the vswitch configuration (validated)

esxcfg-nics -l - to find one Gig link ids ( eg, vmnic2 and vmnic3)
esxcfg-vswitch -l - to find the vswitch portgroups that use these links
esxcfg-vswitch -U vmnic2 vSwitch0 

Workaround II:
To work around this issue, try setting the NIC Failback option to yes on 
vswitch as well port group level.

TagsNetworking; VMware; Troubleshooting