pkrev
Contributor
Contributor

Link goes randomly down on NICs when restarting network or rebooting VM

Hi we are running arround 115 linux servers on ESX4 datacenter, lately we started to experience random NICs link drop on guests when restarting network or rebooting VM Linux server.

When I restart network manualy (couple of restarts) link is detected again.

Thanks for any hints.

dmesg output

eth0: intr type 2, mode 0, 1 vectors allocated

eth0: NIC Link is Up 10000 Mbps

eth0: NIC Link is Down

eth1: intr type 2, mode 0, 1 vectors allocated

eth1: NIC Link is Up 10000 Mbps

eth1: NIC Link is Up 10000 Mbps

netstat -i

Kernel Interface table

Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg

eth0 1500 0 5205 0 0 0 0 0 0 0 BMU

eth1 1500 0 1250 0 0 0 238 0 0 0 BMRU

ethtool eth0

Settings for eth0:

Supported ports:

Supported link modes: 1000baseT/Full

10000baseT/Full

Supports auto-negotiation: No

Advertised link modes: Not reported

Advertised auto-negotiation: No

Speed: Unknown!

Duplex: Unknown! (255)

Port: Twisted Pair

PHYAD: 0

Transceiver: internal

Auto-negotiation: off

Supports Wake-on: uag

Wake-on: d

Link detected: no

ethtool eth1

Settings for eth1:

Supported ports:

Supported link modes: 1000baseT/Full

10000baseT/Full

Supports auto-negotiation: No

Advertised link modes: Not reported

Advertised auto-negotiation: No

Speed: 10000Mb/s

Duplex: Full

Port: Twisted Pair

PHYAD: 0

Transceiver: internal

Auto-negotiation: off

Supports Wake-on: uag

Wake-on: d

Link detected: yes

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1 Reply
AndreTheGiant
Immortal
Immortal

Have a look at vSwitch properties (where are connected the VMs). How many ports do you have?

Andre

Andre | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro
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