Hello,
I'm fairly new to multipath and I am having an issue with it not using
all of my NICs. Currently, my node has 4 gigE NICs to my storage network
and the SAN has 8 gigE NICs to the same network and I am attempting to
setup multipath with ISCSI in order to utilize more than 1 gigabit
connection. However, when I use nload to check the network usage, you
can see the traffic hop around the NICs. For example, data would send
for 2-3 seconds on eth1, then stops and starts on eth2, then stops and
starts back up on eth3. All perfectly distributed, but in this setup,
unable to reach beyond the capacity of a 1 gigabit connection.
I have each NIC on a different network (e.g. 10.1.1.0/24 for eth1,
10.1.2.0/24 for eth2, etc.). Netstat shows that the connections are
being made each to different IPs:
tcp 0 0 10.1.3.8:35493 10.1.5.241:3260 ESTABLISHED
tcp 0 0 10.1.3.8:53972 10.1.3.241:3260 ESTABLISHED
tcp 0 0 10.1.6.8:41090 10.1.4.241:3260 ESTABLISHED
tcp 0 0 10.1.1.8:50754 10.1.1.241:3260 ESTABLISHED
tcp 0 0 10.1.6.8:49780 10.1.5.241:3260 ESTABLISHED
tcp 0 0 10.1.1.8:36938 10.1.6.241:3260 ESTABLISHED
tcp 0 0 10.1.6.8:52009 10.1.6.241:3260 ESTABLISHED
tcp 0 0 10.1.5.8:51630 10.1.1.241:3260 ESTABLISHED
tcp 0 0 10.1.5.8:54481 10.1.4.241:3260 ESTABLISHED
tcp 0 0 10.1.1.8:54504 10.1.5.241:3260 ESTABLISHED
tcp 0 0 10.1.5.8:58229 10.1.3.241:3260 ESTABLISHED
tcp 0 0 10.1.3.8:49031 10.1.1.241:3260 ESTABLISHED
tcp 0 0 10.1.5.8:40551 10.1.6.241:3260 ESTABLISHED
tcp 0 0 10.1.4.8:45016 10.1.5.241:3260 ESTABLISHED
tcp 0 0 10.1.4.8:55665 10.1.4.241:3260 ESTABLISHED
tcp 0 0 10.1.6.8:57472 10.1.3.241:3260 ESTABLISHED
tcp 0 0 10.1.6.8:39278 10.1.1.241:3260 ESTABLISHED
tcp 0 0 10.1.4.8:41329 10.1.6.241:3260 ESTABLISHED
tcp 0 0 10.1.5.8:33553 10.1.5.241:3260 ESTABLISHED
tcp 0 0 10.1.3.8:48950 10.1.6.241:3260 ESTABLISHED
tcp 0 0 10.1.4.8:54752 10.1.1.241:3260 ESTABLISHED
tcp 0 0 10.1.1.8:40911 10.1.4.241:3260 ESTABLISHED
tcp 0 0 10.1.4.8:41135 10.1.3.241:3260 ESTABLISHED
tcp 0 0 10.1.3.8:44606 10.1.4.241:3260 ESTABLISHED
tcp 0 0 10.1.1.8:54677 10.1.3.241:3260 ESTABLISHED
(10.1.*.8 is the node and 10.1.*.241 is the SAN)
Here is my /etc/multipath.conf:
defaults {
path_grouping_policy multibus
path_selector readsector0
polling_interval 3
path_selector "round-robin 0"
failback immediate
features "0"
no_path_retry 1
rr_weight uniform
rr_min_io 100
# user_friendly_names yes
}
Both servers are running Ubuntu 12.04LTS.
Any ideas?
Thanks,
Eric
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