... and you could also use mode 0 in bonding to get roundrobin-lb. -hpj -----Original Message----- From: linux-cluster-bounces@xxxxxxxxxx on behalf of Flavio Junior Sent: Thu 11/13/2008 18:25 To: linux clustering Subject: Re: Clusters with multihomed hosts You can use bonding NICs with active-backup mode. Only one NIC is used at a time, the second will only come up if the primary (active) fails. Dont forget to configure miimon value for link monitor. -- Flávio do Carmo Júnior aka waKKu On Thu, Nov 13, 2008 at 2:21 PM, Michael O'Sullivan < michael.osullivan@xxxxxxxxxxxxxx> wrote: > Hi all, > > I need to know more about using redundant NICs in clusters. > > I have a 2-node cluster with 2 NICs in each node. The first NICs on each > node are connected to one switch, the second NICs on each node are connected > to another switch. This is an experimental arrangement so I am using > /etc/hosts instead of DNS. It appears that the cluster software becomes > confused if I put both NICs for the hosts in the /etc/hosts file, even if > they are in different subnets. Here is the /etc/hosts file I would like to > use: > > # localhost line > 192.168.10.1 node1 > 192.168.10.2 node2 > 192.168.20.1 node1 # Second NIC on node 1 > 192.168.20.2 node2 # Second NIC on node 2 > > but this seems to cause the cluster to hang (confused about which NIC to > use?), so I have removed the last 2 lines and everything works fine. > However, this means if the switch on the 192.168.10.x subnet fails the > cluster will "break". If the cluster would recognise that node1 and node2 > are available via the second NICs then I wouldn't have to worry about this > single point-of-failure. > > I have thought about bonding the NICs which (I think) would take care of > the problem, but I have heard that boding two NICs usually does not give > double the bandwidth. I have read a little about high-availability and > failing over IP addresses, but this seems to be between different nodes, not > different NICs in the same host. > > Would anyone please be able to give me some direction about the best way to > set up my cluster and NICs to make the cluster reliable in the event of > switch failure? And keep the full bandwidth of the NICs intact? > > Thanks in advance for any help you can give. Kind regards, Mike > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster >
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