[dm-devel] Multipath not using multiple NICs at once

[Eric]

I tried "service-time 0", but it didn't seem to change. I ran "multipath 
-ll" and it still shows policy="round-robin 0". I restarted the 
multipath service, but no luck.

Here's my current config after some suggested changes from the 
#device-mapper channel on freenode:

defaults {
         path_grouping_policy    multibus
         path_selector           readsector0
         polling_interval        3
         path_selector           "service-time 0"
         failback                immediate
         features                "0"
         no_path_retry           1
         rr_weight               uniform
         rr_min_io_rq            1
#       user_friendly_names     yes
}


On 3/23/2014 9:52 AM, urgrue wrote:
> > path_selector "round-robin 0"
>
> Have you tried changing this to queue-length or service-time?
>
> On 23/3/14 05:08, Eric wrote:
>> 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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>
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