Change Domain ID value from CLI.

[MitVongNam]

After successfully logged in.
What command will help me to change domain ID of an exisiting sw? Current Fabric OS is 5.0.1b? Thanks in advance.

[Mark Poeschl_2]

Use the 'configure' command. You will be prompted for a series of things - domain ID among them.

[SAKET_5]

Ok, so you do need a "switchdisable" followed by a "switchenable" command to complete the change in domain ID. Depending on how your SAN Fabrics are setup, this might have little to significant impact on your hosts that attach to this switch, i.e. if you have redundant fabrics with multipathing/failover working on all the SAN attached nodes then you should be doing fine with doing one switch per fabric at a time.

Also, the domain IDs on each switch should be unique.

"Configure" is the correct command. But do keep the above in mind.

[MitVongNam]

I want to make sure I fully understand what needs to be carried out:
1) Configure
2) Switchdisable
3) Switchenable
or 2, 1, then 3. By the way, none of this will trigger switchreboot RIGHT!
Separate Question: How Can I tell whether there is movement of data within the fabric wihtout physically being there, nor looking at Green LEDs ?? Is there a command to execute? THANKS.

[Uwe Zessin · Accepted solution]

The order is:
> switchdisable
> configure
...
> switchenable

It will not trigger a switch reboot, but switchdisable turns off all ports and the switchenable will cause a fabric-wide reconfiguration event.

You can check with 'portperfshow' whether there is any traffic.

[MitVongNam]

I need to understand what Fabric-wide Reconfiguration events will do.
Can you either
1)Guide me Where I can read about it. OR
2)Explain in simple term.
I am overwhelmed these information. I am really looking forward to apply these. BUT I don't want to carry out anything which may bring the whole thing down.
THANKS.

[MitVongNam]

OK. I made no progress on resetting value of this switch. But here is I had done.
1) Log in.
2) Switchdisable (Goes from Healthy to Maginal).
3) Configure.
I see no prompt for resetting Domain ID. But there was a prompt on "Inisistence Domain ID Mode Y/N" ? I did reply NO. Am I missing something?? Switches are 41XX, 38XX. All are configured with v5.0.1b.
4) I reluctantly gave in after Switchenable.

[MitVongNam]

OK. I made no progress on resetting value of this switch. But here is I had done.
1) Log in.
2) Switchdisable (Goes from Healthy to Maginal).
3) Configure.
I see no prompt for resetting Domain ID. But there was a prompt on "Inisistence Domain ID Mode Y/N" ? I did reply NO. Am I missing something?? Switches are 41XX, 38XX. All are configured with v5.0.1b.
4) I reluctantly gave in after Switchenable.

[Uwe Zessin]

Here is part of a log I have saved from an older session. While I don't have one from V5, I am fairly sure it still does apply:

+-----
fcswa2:admin> configure

Configure...

Fabric parameters (yes, y, no, n): [no] y <--

Domain: (1..239) [1] 2 <--
BB credit: (1..16) [16]
+-----

The change is fairly disruptive. If I remember correctly, the routes are recomputed, for example. It should not matter much as long as you have a second, redundant fabric, but the change *will* lead to new hardware paths for IBM AIX and HP-UX.

[MitVongNam]

I did it! WOOOOOOOOO!!!
THANKS. My mistake...
I was juggling several things at the same time and got sidetracked..
Again. THANKS.. THANKS!!!

LEARNED A LOT!!!

[SAKET_5]

Ok, so you asked what a Fabric Reconfiguration means...and here it is straight from BCFP Notes:

RECONFIGURE FABRIC (RCF) VS. BUILD FABRIC (BF)
â ¢ RCF is a disruptive process
o Domain ID lists are cleared
o Class F traffic is aborted in flight
o Open data exchanges (Class 2/3 traffic) are discarded
â ¢ Overlapping Domain IDs detected
â ¢ Principal Switch election process
Build Fabric (BF) is a non-disruptive process
o Principal switch, priority and routes are preserved
â ¢ Caused by a failure of a principal ISL, trunk master, fabric merge with no overlap or unconfigured
switch is added
â ¢ Open exchanges are not discarded

Hope, it helps.

[MitVongNam]

THANKS. Learned a lot!!!