RE: Thoughts on crs installation on HP-UX

From: Yong Huang <>
Date: Sun, 25 Jan 2009 11:32:58 -0800 (PST)
Message-ID: <>

> Neither bonding nor trunking offers a perfect solution for Ethernet
> device HA - if you try to use link aggregation, they have to both be
> connected to the same switch, creating a SPOF, and if they're connected
> to both switches, then either MII link notification (unreliable with
> certain drivers) or ARP pinging (bad mojo happens if an external network
> failure occurs) has to be used to detect failures.
> Not that it won't work fine in most environments, but Linux bonding
> isn't nearly as nice as what the commercial clustering solutions
> (Veritas, SG, etc.) offer.
> Thanks,
> Matt


Are MII link notification and ARP pinging something done on the switch or the workstations (servers)? Is the latter what arping Linux command does?

# arping -I bond0 -c 2
ARPING from bond0 Unicast reply from [00:1B:78:9C:A3:0A] 0.645ms

But I think your point is to have a way to detect the failure of a slave interface that makes up the bonding interface. I don't know if arping does that. But we can simply run ifconfig or `ip address show' and grep DOWN. Right? Or check words like "link status definitely down for interface eth3" in /var/log/messages? We rarely had issues with these interfaces. Linux bonding seems to be fairly stable for us. Our two slave interfaces connect to two switches each.

Yong Huang       

Received on Sun Jan 25 2009 - 13:32:58 CST

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