[DRBD-user] Problem with DRBD sync stalling with vmware vmxnet3 10Gb adapter

Sean McCreadie smccreadie at CanyonPartners.com
Fri Nov 19 19:54:20 CET 2010

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


I am having issues using the vmware 10Gb virtual adapter with vmxnet driver and drbd.  When I go to sync the resources, the sync will always stall at some point.  I have confirmed that the vmxnet driver is the culprit, as I have no issues using the e1000 NIC and driver on the same VMs.

My setup is this:

-          ESXi 4.1 on new HP DL 380 G7 servers

-          Onboard Broadcom NC382i gigbit adapter

-          Add on Emulex OneConnect 10Gb SFP adapter

-          Two identical fedora 13 VMs setup with drbd version 8.3.7 installed

-          One SFP+ cable running direct between the two 10Gb NICs on each server, no switch.

-          One 1Gb CAT6 cable running direct between two 1Gb NICs on each server, no switch.

When I add a vmxnet3 virtual adapter to the VMs and start drbd, it begins syncing and then quickly will stall.  The behavior is identical when I map the virtual NIC to either the Emulex 10Gb adapter on the ESXi host, or the Broadcom 1Gb adapter. So I know its not the physical link that's the issue.

Conversely when I add the e1000 NIC to the VMs and start drbd, everything syncs fine with no issues, and again this is the same no matter what physical link I connect the VMs to.

I installed vmware tools and verified it loaded the vmxnet3 module successfully.

I have looked in the messages log but haven't found anything, is there another log I should be reviewing?

Thanks in advance for any insight into this.


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