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Re: [Linux-cluster] Packet loss after configuring Ethernet bonding






----- Original Message -----
From: Digimer <lists alteeve ca>
To: Zama Ques <queszama yahoo in>; linux clustering <linux-cluster redhat com>
Cc: 
Sent: Saturday, 10 November 2012 8:24 AM
Subject: Re: [Linux-cluster] Packet loss after configuring Ethernet bonding

On 11/09/2012 09:26 PM, Zama Ques wrote:
> Hi All, 
> 
> Need help on resolving a issue related to implementing High Availability at network level . I understand that this is not the right forum to ask this question , but since it is related to HA and Linux , I am asking here and I feel somebody here  will have answer to the issues I am facing .
> 
> I am trying to implement Ethernet Bonding , Both the interface in my server are connected to two different network switches . 
> 
> My configuration is as follows: 
> 
> ========
> # cat /proc/net/bonding/bond0
> 
> Ethernet Channel Bonding Driver: v3.6.0 (September 26, 2009)
> 
> Bonding Mode: adaptive load balancing Primary Slave: None Currently 
> Active Slave: eth0 MII Status: up MII Polling Interval (ms): 0 Up Delay 
> (ms): 0 Down Delay (ms): 0
> 
> Slave Interface: eth0 MII Status: up Speed: 1000 Mbps Duplex: full Link 
> Failure Count: 0 Permanent HW addr: e4:e1:5b:d0:11:10 Slave queue ID: 0
> 
> Slave Interface: eth1 MII Status: up Speed: 1000 Mbps Duplex: full Link 
> Failure Count: 0 Permanent HW addr: e4:e1:5b:d0:11:14 Slave queue ID: 0
> ------------
> # cat /sys/class/net/bond0/bonding/mode 
> 
>   balance-alb 6
> 
> 
> # cat /sys/class/net/bond0/bonding/miimon
>    0
> 
> ============
> 
> 
> The issue for me is that I am seeing packet loss after configuring bonding .  Tried connecting both the interface to the same switch , but still seeing the packet loss . Also , tried changing miimon value to 100 , but still seeing the packet loss. 
> 
> What I am missing in the configuration ? Any help will be highly appreciated in resolving the problem . 
> 
> 
> 
> Thanks
> Zaman

 > You didn't share any details on your configuration, but I will assume
> you are using corosync.

> The only supported bonding mode is Active/Passive (mode=1). I've
> personally tried all modes, out of curiosity, and all had problems. The
> short of it is that if you need more that 1 gbit of performance, buy
> faster cards.

> If you are interested in what I use, it's documented here:

>  https://alteeve.ca/w/2-Node_Red_Hat_KVM_Cluster_Tutorial#Network

>  I've used this setup in several production clusters and have tested
>  failure are recovery extensively. It's proven very stable. :)

 
Thanks Digimer for the quick response and pointing me to the link . I am yet to reach cluster configuration , initially trying to  understand ethernet bonding before going into cluster configuration. So , option for me is only to use Active/Passive bonding mode in case of clustered environment. 
Few more clarifications needed , Can we use other bonding modes in non clustered environment .  I am seeing packet loss in other modes . Also , the support of  using only mode=1 in cluster environment is it a restriction of RHEL Cluster suite or it is by design . 

Will be great if you clarify these queries .

Thanks in Advance
Zaman


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