Rick,
Thank you for the quick response. We did receive the "busy" message in
additions to the "erp failed" message when I had both linux guests defined to
the same channel path. When using different channel paths the "busy" message
went away. As far as NPIV, we have NPIV turned on at the Brocade switch level,
but it is not turned on at the zVM lpar level. We just tried the same fcp setup
with two linux guests running SUSE10SP2 on the same vm lpar. It works without
errors under SUSE linux. So it looks like the problem is with Redhat linux. We
are going to research that avenue next.
Thank you, Bob
-----Original Message-----
From: The IBM z/VM Operating System [mailto:[email protected]] On Behalf
Of Richard Troth
Sent: Wednesday, June 23, 2010 12:26 PM
To: [email protected]
Subject: Re: Shared fcp with two linuxguests
For the problem you describe, I would expect a specific "busy" message.
> tdcrac02 kernel: zfcp: unit erp failed on unit 0x0020000000000000 on
> port
> 0x5001738001820141 on adapter 0.0.8001
In any case, are you using a shared physical FCP adapter? You'll then also
need NPIV.
Without NPIV, a single physical FCP adapter presents one WWPN to the SAN, for
all LPARs using it and for all subchannels on it. With NPIV, you get a
different (virtual) WWPN for each subchannel on each LPAR.
If you DO have NPIV in place, then check that the storage is zoned and mapped
to both (virtual) WWPNs (per path), one for each of the guests.
Probably obvious to you, so no offense, but it's easy to miss.
-- Rick; <><
On Wed, Jun 23, 2010 at 10:13, Robert J McCarthy <[email protected]>
wrote:
> We are planning to set up an Oracle RAC environment with two linux
> guests on the same vm lpar. They will be accessing the same fcp disk.
> The problem that we are having is as as follows:
> The 1st guest is booted. An "lszfcp -D" command displays all of the
> expected information including the WWPN and lun of the san.
> The 2nd guest is booted. An "lszfcp -D" command will show the WWPN of
> the san, but not the lun information for the san. The following error
> is also found in the linux log
> tdcrac02 kernel: zfcp: unit erp failed on unit 0x0020000000000000 on
> port
> 0x5001738001820141 on adapter 0.0.8001
> We are running zVM 5.4 and Redhat 5.4 of linux. The fcp disks are
> assigned a separate channel path for each guest through DEDICATE
> statements in VM. Any ideas ?
> Thank you, Bob
>
