In Clustered Data ONTAP 8.2.1, there
isn’t currently a way to set port priority for the LIF’s failover group. These
are your failover-policy options:
::>
net int modify -failover-policy ?
nextavail
- Next failover target selected based on next port in failover targets list,
preferring local ports first
priority
- Next failover target selected based on first available port in failover
targets list
disabled
- Failover disabled
And running the command “net int
failover ?” you’ll notice that the commands that controlled priority are
deprecated:
::>
net int failover ?
(network interface failover)
append (DEPRECATED)-Append a
logical interface failover rule
change-priority (DEPRECATED)-Change the priority
of a logical interface's failover rule
create (DEPRECATED)-Create a
logical interface failover rule
delete (DEPRECATED)-Delete a
logical interface failover rule
insert
(DEPRECATED)-Insert
a logical interface failover rule
modify (DEPRECATED)-Modify a
logical interface failover rule
My unofficial analysis seems to suggest
that port priority is by default set something like this (for a FAS62XX with
data ports e0a, e0b, e0d, e0f):
Priority
1: Node 1 - e0a
Priority
2: Node 1 - e0b
Priority
3: Node 1 - e0d
Priority
4: Node 1 - e0f
Priority
5: Node 2 - e0a
Priority
6: Node 2 - e0b
....
And I think that gives the picture: Node
1 ports in alphabetical order, then Node 2 ports in order, then Node 3... Even
if you try creating your failover-group in a particular order, the behaviour is
as above.
To show what I mean, run the command:
::>
net int failover show
The home port will be the first failover
target and then you’ll see the order mentioned above.
One thing that’s not immediately
obvious though, is that the LIF’s home-port doesn’t have to be in its
failover-group (this is the titular trick). So, say if you’re got two 10 GbE
ports, and you’re planning on having say an intercluster LIF on each (to take
advantage of increased TCP sessions), and you’ve got data LIFs on those two 10
GbE ports also, but you don’t want the intercluster LIF to failover to another
10 GbE port if it’s home goes down, then this is what you can do:
Note:
In the following example, e0a and e0b are our 1 GbE ports, and e0d and e0f are
our 10 GbE ports. Our first intercluster LIF is going on e0d (a second would go
on e0f.)
::>
net int failover-group create -failover-group NODE1-ICL -node NODE1 -port e0a
::>
net int failover-group create -failover-group NODE1-ICL -node NODE1 -port e0b
:>
net int create -vserver NODE1 -lif NODE1-ICL1 -home-port e0d -home-node NODE1
-role intercluster -failover-group NODE1-ICL -failover-policy nextavail
-address 10.10.10.101 -netmask 255.255.255.0
::>
net int show NODE1-ICL1 -fields home-port
vserver lif home-port
-------------
---------- ---------
NODE1
NODE1-ICL1 e0d
::>
net int failover show NODE1-ICL1
Logical Home Failover Failover
Vserver Interface Node:Port Policy Group
--------
--------------- --------------------- --------------- ---------------
NODE1
NODE1-ICL1 NODE1:e0d nextavail NODE1-ICL
Failover Targets: NODE1:e0d,
NODE1:e0a,
NODE1:e0b
We demonstrate the failover working as
anticipated below. First we down the LIF - NODE1-ICL1’s - home port e0d, and
observe it goes to e0a; then down port e0a and observe it goes to port e0b;
then we up e0a and e0d (note that the default auto-revert settings for
intercluster LIFs is false) and then down e0b, and observe it goes back to its
home-port e0d.
::>
set adv
::*>
net port modify -node NODE1 -port e0d -up-admin
false
::*>
net int show NODE1-ICL1 -fields home-port
vserver lif home-port
-------------
---------- ---------
NODE1
NODE1-ICL1 e0a
::*>
net port modify -node NODE1 -port e0a -up-admin
false
::*>
net int show NODE1-ICL1 -fields home-port
vserver lif home-port
-------------
---------- ---------
NODE1
NODE1-ICL1 e0b
::*>
net port modify -node NODE1 -port e0d -up-admin
true
::*>
net port modify -node NODE1 -port e0a -up-admin
true
::*>
net int show NODE1-ICL1 -fields home-port
vserver lif home-port
-------------
---------- ---------
NODE1
NODE1-ICL1 e0b
::*>
net port modify -node NODE1 -port e0b -up-admin
false
::*>
net int show NODE1-ICL1 -fields home-port
vserver lif home-port
-------------
---------- ---------
NODE1
NODE1-ICL1 e0d
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