I use teamd to connect two linux hosts. the connection use 3 nic
at each host with direct ethernet cable. the protocol is roundrobin.
it runs fine for several month. until one day I found the
DRBD(Distributed Replicated Block Device) connection over the link was
broken. I test the network and found about 1/3 of ping packets lost
between the hosts. it seems one nic dead, but "ifconfig" shows me all
the nic are there and no TX/RX errors. "teamdctl team0 state" show all
three links are up. those are production machines so I don't have much
time to debug the situation. I poweroff then poweron the two hosts and
everything is back to normal again.
I use roundrobin to get triple bandwith. but if one nic problem
will cause the whole link down, I need to reconsider it. I use the
default "ethtool" to detect link status, will "arp_ping" be better to
detect link failure?
I have heard about that you should not use teamd/bonding to connect
two hosts directly. but I never found the reason why. maybe someone
can give a short advice about it?
my linux version is scientific linux 7.0. teamd version which comes
with the os is 1.9 (teamd-1.9-15)
"teamdctl team0 config dump" shows as below: