Convert a 4 node to 2 node 3par.....

[turbogizzmo]

This is purely development, non-production, non-supported question.

Has anyone successfully converted a 4 node to a 2 node? And I don't mean the easy way when you have node 0 and 1. I mean with node 2 and 3.

[MammaGutt]

So you want to keep nodes 2 and 3 in the system and remove 0 and 1?

Do you intend to keep the data on the array? If no, just start from scratch with ootb.

If yes, I don't quite see how you can do this. As far as I know, you don't have a dismissnode command, so even if you were to empty all PDs behind nodes 0 and 1, dismiss those and dismiss the cages, the system will be forever degraded with 2 nodes missing (and probably not power up after power loss) and probably crash when the second node is shutdown/removed.

[turbogizzmo]

I have only 2 and 3 and 0 and 1 was sent elsewhere. Of course 0 and 1 will work but not sure if anything can be done to make 2 and 3 work.

How about doing something crazy like a node rescue to make node 2 the new node 0 pulling data from node 3......

Also there is no data, not in production....

[Georgii]

Read PM.

[pbzw]

The thread is quiet old, but I'm also interested in this topic.

Got a single node 7400 (controller 2+3) to play with.
Hardware seems totally fine (also flash disks in the controllers seem to have valid content), but the controllers won't boot up.

Symptoms:
- amber battery LED is on -> but this seems to be normal behaviour at start, because also our 7400 (in production) does the same, but when the controllers get ready the light goes off. I also tested it with working PSUs... so the PSUs/batteries should be fine
- warning and UID LEDs keep start flashing, become briefly solid and continue to flash forever
- unfortunately NO serial output

I don't think this is a hardware fault, rather two desparate controllers trying to find the other node with c0 and c1?

Can someone help me with this? Or explain whats happening?

[MammaGutt]

You should have serial output during boot. If you don't you might have incorrect cable or terminal settings on you laptop.

[pbzw]

The same cable works on our 7400.
So I guess it has to work also on this one.

[feldsam]

Hello, you can do it easily. Connect to both nodes serial console and start 3par. durring boot when you see CPU informations press CTRL+W on both nodes. You get into whack menu. Type 'prom edit' and go throught conf values by pressing Enter. Stop on 'node id' key and change it from 02 to 00 resp. from 03 to 01. Continue by pressing enter. At the end type 'quit'. 3par nodes continue booting process with new node IDs. Thats all.

[pbzw]

Thanks for your helpful infos.

Unfortunately I do not get ANY serial output, as described above.
But it is for sure no cable/setting problem.

Thus I believe the controllers are not starting.
I thought it may be because it is necessary to boot the controllers connected to node 0 and node 1.

But I'm starting to believe it might be a hardware issue.
The only hint I have are the symptoms described above (LED status).
But I cannot figure out what is wrong.

[feldsam]

Hello, you should have serial output even if it is node 02 and 03. Check for node id is in later stages of boot. So looks like controllers are gone, if you don't get any output on serial console.