Hello ,
Thanks for reply . I am new in this configuration. I
checked the links provided in earlier email chain. But I am still not clear
the file where I will have to change the WWPN number .
On Wed, Jun 17, 2015 at 3:45 PM, Steffen Maier <[email protected]>
wrote:
> On 06/17/2015 07:45 AM, Mainframe Mainframe wrote:
>
>> We are using SUSE 11.2 z/Linux system with FCP channels. There are issues
>> with one host that WWPN being dropped .
>> So, now we want to use different WWPN number for this host and bring up
>> again.
>>
>
> Do you really mean the WWPN for host as in Fibre Channel host (Linunx
> fc_host), i.e. the initiator WWPN of the FCP device itself?
>
> Why?
>
> It's the machine (not the OS) that automatically manages initiator WWPNs;
> both the physical WWPN of the FCP channel as well as all the virtual WWPNs
> of NPIV-enabled FCP devices of FCP channels.
> Both contain an IBM OUI prefix and something derived from the CEC's I/O
> serial.
> NPIV WWPNs also contain an automatically generated suffix.
> Physical Channel WWPNs also contain the PCHID followed by 1 as 4 trailing
> hex digits (as of z196).
>
> http://www.redbooks.ibm.com/redbooks/SG247266/wwhelp/wwhimpl/api.htm?href=10-1-1.htm
>
> For doing this, as per my knowledge we have to change entries in two
>> places
>>
>> 1) z/VM text file, which is used while z/Linux comes up and have network
>> related information etc.
>>
>
> If you refer to the parm file used to pass kernel parameters at boot/IPL,
> then this does not deal with initiator WWPNs.
> Only for some distro installers it can be used to configure LUNs but that
> involves storage target WWPNs.
>
> 2) Somewhere in z/Linux kernel. I am not sure the exact location
>>
>> Can anybody help me making this WWPN changes in z/Linux kernel .
>>
>
> Linux configuration only deals with storage target WWPNs.
> Pointers are in a presentation I referred to earlier:
> http://www.mail-archive.com/[email protected]/msg67433.html
>
> --
> Mit freundlichen Grüßen / Kind regards
> Steffen Maier
>
> Linux on System z Development
>
> IBM Deutschland Research & Development GmbH
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