Re: [Ltsp-discuss] LTSP and bonding

[Klaus-Peter N. <kla...@av...>]

Joe Baker schrieb:
> It is conceivable that in the instance of a nuclear power plant control
> system or in a 911 emergency call center, etc that someone might want to
> build in redundant Ethernet connections to the thin client.

Or in airtraffic control ...

> In my experience, it is more likely that a network switch would fail to
> service a port properly than for a NIC to fail, but perhaps having an
> extra NIC would provide a workaround for a failing switch (especially if
> there is also another switch).

> Can we assume that the Ethernet connections would connect via different
> switches?

Yes. The two client NICs are connected to two different switch.
Each server has two NICs. The two server NICs are also connected to the two 
different switch.

> Would they need the same IP address or different IP addresses?

Look, thats a bonding configuration mode 1 (/etc/sysconfig/network/ifcfg-bond0 
on SLES 9):

BOOTPROTO='static'
BROADCAST='10.180.1.255'
IPADDR='10.180.1.2'
MTU=''
NETMASK='255.255.255.0'
NETWORK='10.180.1.0'
REMOTE_IPADDR=''
STARTMODE='onboot'
UNIQUE='Ccgx.RfYI5sfd_88'
BONDING_MASTER=yes
BONDING_SLAVE_0='bus-pci-0000:02:02.0'
BONDING_SLAVE_1='bus-pci-0000:07:01.0'
BONDING_MODULE_OPTS='miimon=100 mode=1 use_carrier=0'

The two BONDING_SLAVEs (the two ethernet cards) are both running with the same 
IP-Address 10.180.1.2.
So you can pull one LAN cable. Or one ethernet card or one switch can fail. The 
server is still availaible.

This is what we need for the clients.

Greetings

KP

-- 
Klaus-Peter Niedermann

Phone:  +49 (0) 7541 / 282-470
         +49 (0) 7531 / 696-355
Fax:    +49 (0) 7531 / 696-315
E-mail: kla...@av...

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