HPE EVA Storage

EVA4400 - WWN Replacement

 
Albatross
Regular Advisor

EVA4400 - WWN Replacement

Hi Folks,

I was asked to verify the possible caveats of performing a WWN change of an already initialized EVA4400, due to mis-entering during initial setup. Our biggest concerns are:

- Would this affect vdisk presentation?
- Would this impact normal array operations?

The environment consists of 480c and 680c blades, running Windows Server 2008, connected via 4/24 SAN Switches. Array and firmware is up to date.

Thanks in advance for your insight,
5 REPLIES 5
Uwe Zessin
Honored Contributor

Re: EVA4400 - WWN Replacement

The WWN is stored on all metadata disks and has become part of the initialized system. You can put the disk drives into a different EVA4400 and upon boot it will take over that identity including the WWN.

You will have to save all data, 'uninitialize' the system (which means total loss of *all* data !!). Then you can assign a new WWN, re-initialize the system and restore the data.
.
Dileep..
Trusted Contributor

Re: EVA4400 - WWN Replacement

Hello,
WWWN numbers are unique to EVA and its mandatory to assign the correct WWWN number.
The only way to change the WWN number of an EVA is
1) Take the backup
2) reinitialise EVA , enter correct wwwn.
3) restore the backup

Ravi_Shankar
Frequent Advisor

Re: EVA4400 - WWN Replacement

You should also take SSSU report (HP Tool to take Arrays configuration), Controller Events logs before performing any operation on EVA.

You can ask HP to provide SSSU tool if you do not have that.
Uwe Zessin
Honored Contributor

Re: EVA4400 - WWN Replacement

SSSU.exe is supplied with every CV-EVA installation -
just browse your C:\ drive...
.
Albatross
Regular Advisor

Re: EVA4400 - WWN Replacement

Thanks for your input, it's very appreciated!