Rick,
We checked into NPIV support within Redhat. Apparently releases prior to R5
did not support NPIV as shipped, but according to Redhat NPIV is supported in
R5. We are at R5.4. We are checking to see if there might be some Redhat
configuration that must be performed to support NPIV.
Thank you, Bob
-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf
Of Richard Troth
Sent: Wednesday, June 23, 2010 1:41 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Shared fcp with two linuxguests
I THINK (though am not sure, and do NOT understand why) that the FCP driver in
Linux must support NPIV, so check if your RH release has NPIV support for FCP.
-- R; <><
On Wed, Jun 23, 2010 at 12:53, Robert J McCarthy <bob.mccar...@custserv.com>
wrote:
> 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:ib...@listserv.uark.edu]
> On Behalf Of Richard Troth
> Sent: Wednesday, June 23, 2010 12:26 PM
> To: IBMVM@LISTSERV.UARK.EDU
> 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 <bob.mccar...@custserv.com>
> 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
>>
>
