> I have a doubt about the test Ips in the IPMP group and the daemon's
> (mpathd) use of it to probe the target systems and detect failure.
>
> Lets say i have qfe0 and qfe1 in the IPMP group group1.
> Questions are:
>
> 1. Do the test IPs on this interfaces have to be in the same subnet (e.g
> 10.5.30.5 and 10.5.30.6 v/s 10.5.30.5 and 10.5.31.5)
All test IP addresses should be on the same subnet -- but this need not be
the same subnet as your data addresses. That is, assuming multiple
subnets are present on the same wire, you can use another subnet (we often
recommend RFC1918 addresses to reduce the burden on routable IPv4
addresses). However, there must be other hosts on the link that have
addresses on whatever subnet you choose.
> 2. The Data IP (which will float) accross this 2 interfaces and which
> application will be using also have to be in the subnet? (e.g 10.5.30.7)
See above; no.
> 3. Target hosts, does it have to be the hosts in the same subnet or
> reachable via immediate router or it can be any where in the
> network.Please provide example of configuring target hosts (in both
> scenarios if the 2nd scenario of target host being somewhere in the
> network table).
See above.
> 4. Any suggestions on using Link based failure v/s probe based failure
> detection
As per in.mpathd(1M):
The in.mpathd daemon can detect NIC failure and repair
through two methods: by monitoring the IFF_RUNNING flag for
each NIC (link-based failure detection), and by sending and
receiving ICMP echo requests and replies on each NIC
(probe-based failure detection). Link-based failure detec-
tion requires no explicit configuration and thus is always
enabled (provided the NIC driver supports the feature);
probe-based failure detection must be enabled through the
configuration of one or more test addresses (described
below), but has the benefit of testing the entire NIC send
and receive path.
Is there something more you're curious about?
--
meem
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