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Re: [Freeipmi-users] ipmipower

From: Kevin Fox
Subject: Re: [Freeipmi-users] ipmipower
Date: Mon, 14 Jan 2008 14:59:50 -0800

In case it helps anyone, after a lot of probing and help from Al/IBM
(thanks again), we discovered that some IBM BMC's have real problems
with BMC's crashing if they see too many ethernet broadcasts. Isolating
the BMC's to its own network helped, as was turning off some broadcast
traffic the switches were doing, but the biggest help was setting the
IP/MAC address of the node running ipmipower as the Gateway addresses in
the BMC. The BMC's were each doing an ARP request back to the node
running ipmipower and then some smallish random set were blowing their
brains out under the resulting broadcast storm.


On Mon, 2007-12-10 at 17:44 -0800, Kevin Fox wrote:
> Having problems with ipmipower. I have a 192 node cluster and am trying
> to use it with Powerman/ipmipower. Powerman -q is showing a large,
> random assortment of of nodes in the unknown state. It changes each run.
> I went to the underlying ipmipower commands and stat in interactive mode
> comes up with a random set of timed out nodes.
> The man page refers to setting fixed mac addrs in the arp tables, and I
> tried that.
> Doing a tcpdump while doing an ipmiping shows the bmc, at roughly every
> two minutes, makes an arp request towards the machine running ipmiping
> and drops all packets on the floor while it is waiting for the arp
> response. So every bmc drops some packets. Also, when starting up
> ipmiping, it drops some packets while it does an initial arp request.
> I think this is what is confusing ipmipower. I've tried lots of
> different settings for ipmipower but have been unable to find a set of
> options that come up with a reliable stat. Any ideas what I should set
> things to? (These nodes are IBMx3550's using an RSAII if that helps)
> Thanks,
> Kevin
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