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/linux-390@vm.marist.edu/msg67433.html
--
Mit freundlichen Grüßen / Kind regards
Steffen Maier
Linux on System z Development
IBM Deutschland Research & Development GmbH
Vorsitzende des Aufsichtsrats: Martina Koederitz
Geschaeftsfuehrung: Dirk Wittkopp
Sitz der Gesellschaft: Boeblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
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