We have fixed this problem but made more than one change so we do not know the
cause - it would be nice to know who to blame !
Thanks for all the advice. I followed up Scott's suggestion of creating an exec
to delete the EDEV' s paths and to do SET EDEV uuuu CLEAR so that I could vary
the CHPIDs offline. (I found that to redefine the EDEVs I had to use 'SET EDEV
uuuu' providing the Type, Attributes, FCP_dev, wwpn and LUN without the text
'ADD PATH' for the first path and with the text 'add path' for the other paths).
There is no zoning or LUN masking involved and the NPIV wwpns had not changed
(the physical NPIVs had changed - they contains the new PCHIPID ids). We had
already tried switching everything in the paths off/on.
The changes which we made to resolve the problem were: - switch firmware was
upgraded from 6.1.1a to 6.3.0d . Neither had been qualified for zBC12. (We
later upgraded to 7.0.0d)- removed the link between the two SAN switches. The
SAN Volume Controller documentation says that the fibre networks should be
independent. When I disconnected the link I found that one of the SFPs came out
too - it had not 'clicked' into place.- cleaned the z12 end of the fibre links.
All of the zlinuxes then came up and stayed up, except for some which relied on
the ISL being in place. ie the LOADDEV parameters (for loading from chpid 18)
specified an SVC wwpn which was now accessible only from the other CHPID, which
was easily fixed.
Maybe the problem was due to FCP channel microcode in z12 (or z114/196). Or
maybe there were some fabric errors which were exacerbated by the faster z12
IFLs.
Keith
On Monday, 8 June 2015, 15:39, Raymond Higgs <rayhi...@us.ibm.com> wrote:
Hi Keith,
Please check zoning and lun masking. I think the SVC management interface calls
them hosts. If youdidn't do an MES upgrade, then the WWPNs of your channels
changed.
Regards,
Ray Higgs
System z FCP Firmware Development
Bld. 706, B42
2455 South Road
Poughkeepsie, NY 12601
(845) 435-8666, T/L 295-8666
rayhi...@us.ibm.com
From: Keith Gooding <kw...@yahoo.co.uk>
To: LINUX-390@VM.MARIST.EDU
Date: 06/04/2015 04:23 PM
Subject: Problems withSCSI-over-FCP after machine upgrade
Sent by: Linux on 390Port <LINUX-390@VM.MARIST.EDU>
This may not be the proper forum but maybe someonecan help.
We have a small number of linux systems (<32) under z/VM 6.3 whichuse SCSI
connections to LUNs on a SAN Volume Controller via a couple ofIBM SAN24B
switches (the equivalent of Brocade 300). There are also somesystems which use
EDEVs on the same SVC. This had worked on z10 BC forabout 5 years without
problems.
Last week the z10 was upgraded to a zBC12, retaining the same FICON
cards(4Gbs), but not necessarily associated with the same CHPIDs. Since thena
number of the LUN connections have been 'lost', cauing linux systemsto fail.
SCSIDISC displays eg "HCPRXS975I Virtual FCP device 1A05ignored because the
adapter was not able to connect to the fibre channelnetwork". It is then not
possible to rebot the linux system.
Restarting 'everything' - ie SVC nodes, SAN switches, CHIPD vary off/on-
cleared the problem for a while.
Any ideas where to start looking ?. I have discovered that we have >32 FCP
subchannels defined on the CHPID (but highest used unit addressis 1f, and there
are only about a dozen in use). Also the switch has notbeen 'qualified' for use
on z12 (but it appears that it was not qualifiedfor z10 either).
Any advice greatly appreciated !
----------------------------------------------------------------------
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 orvisit
http://www.marist.edu/htbin/wlvindex?LINUX-390
----------------------------------------------------------------------
For more information on Linux on System z, visit
http://wiki.linuxvm.org/
----------------------------------------------------------------------
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
----------------------------------------------------------------------
For more information on Linux on System z, visit
http://wiki.linuxvm.org/
