The NPIV_WWPN is assigned to a host by the storage controller so you might consider using the host/owner name to establish uniqueness. I believe that there is an owner entry already in the table.
From: Thang Pham [mailto:[email protected]] Sent: Friday, April 26, 2013 2:55 PM To: xCAT Users Mailing list Cc: xCAT Users Mailing list Subject: Re: [xcat-user] How does xCAT deal with NPIV provisioned LUNs? Chuck and I discussed support for NPIV a little bit more. This is what we came up with: To specify a SCSI/FCP disk uniquely, you would need: - LUN (in the current table & used by Linux) - WWPN (in the current table & used by Linux) - FCP channel (in the current table & used by Linux) - NPIV_WWPN (only unique to CEC) - FCP_WWPN There are a few WWPNs, but they all have different meaning. Only the LUN, WWPN, and FCP channel are required by Linux. In the case of NPIV, you would need the NPIV_WWPN and FCP_WWPN. This can be found by: ==> q fcp wwpn 2fc8 FCP 2FC8 NPIV WWPN 00000000000081D4 CHPID 23 PERM WWPN 500507601D801D6F These WWPNs are ones that are not used or seen by Linux, but are required to uniquely identify the disk across CECs. Please suggest a better name for these WWPNs if you have one. We can put this in the next release, 2.8.2, when it comes out in a few months. Do you have any suggestions or refinements that we should also include? Regards, ------------------------------------- Thang Pham IBM Poughkeepsie Phone: (845) 433-7567 e-mail: [email protected]<mailto:[email protected]> [Inactive hide details for "Will, Chris" ---04/25/2013 01:23:22 PM---Finally got a couple of luns to test with and the second lu]"Will, Chris" ---04/25/2013 01:23:22 PM---Finally got a couple of luns to test with and the second lun I tried to add to the pool got an error From: "Will, Chris" <[email protected]<mailto:[email protected]>> To: xCAT Users Mailing list <[email protected]<mailto:[email protected]>>, Date: 04/25/2013 01:23 PM Subject: Re: [xcat-user] How does xCAT deal with NPIV provisioned LUNs? ________________________________ Finally got a couple of luns to test with and the second lun I tried to add to the pool got an error. slxmfdev3:~ # chhypervisor xsys --addzfcp2pool zfcp1 free 50000972081ca531 0000000000000000 68G xsys: New zFCP device pool zfcp1 created xsys: Adding zFCP device to zfcp1 pool... Done slxmfdev3:~ # chvm slxmfdev2 --addzfcp zfcp1 0402 1 68g replace_root_device slxmfdev2: Using device with WWPN/LUN of 50000972081ca531/0000000000000000 slxmfdev2: Adding FCP device... Done slxmfdev2: Setting LOADDEV directory statements slxmfdev2: Replacing LNX148's directory entry... Done Now to add the second lun which will be used by another guest slxmfdev3:~ # chhypervisor xsys --addzfcp2pool zfcp1 free 50000972081ca531 0000000000000000 68G xsys: (Error) zFCP device already exists Possible solutions would be: - Require the owner to be specified or the npiv wwpn of the server (the wwpn maintained in the xcat table is the destination wwpn and is the same of all servers). - Opt out of the requirement to maintain a zfcp table on the hcp. Chris From: Thang Pham [mailto:[email protected]] Sent: Wednesday, April 24, 2013 11:20 AM To: xCAT Users Mailing list Cc: xCAT Users Mailing list Subject: Re: [xcat-user] How does xCAT deal with NPIV provisioned LUNs? We are trying to verify this. The current version of xCAT has limited support for SCSI/FCP devices. We plan to add more support in later releases. It basically does most of the tailoring in autoyast/kickstart during the provision phase. If there is an existing VM that you want to config SCSI devices for, it does most of the tailoring on the Linux filesystem, editing /etc/zfcp.conf and such files and echoing the WWPN and LUN through into udev. I do not see a problem (yet) with using NPIV, since most of the configuration is done on the FCP channel(s). Regards, ------------------------------------- Thang Pham IBM Poughkeepsie Phone: (845) 433-7567 e-mail: [email protected]<mailto:[email protected]> [Inactive hide details for "Will, Chris" ---04/23/2013 12:33:53 PM---Here is what I mean. Here are two guests on our vmax npiv]"Will, Chris" ---04/23/2013 12:33:53 PM---Here is what I mean. Here are two guests on our vmax npiv array. slx111cln1:~ # lszfcp -D From: "Will, Chris" <[email protected]<mailto:[email protected]>> To: xCAT Users Mailing list <[email protected]<mailto:[email protected]>>, Date: 04/23/2013 12:33 PM Subject: Re: [xcat-user] How does xCAT deal with NPIV provisioned LUNs? ________________________________ Here is what I mean. Here are two guests on our vmax npiv array. slx111cln1:~ # lszfcp -D 0.0.0400/0x50000972081ca531/0x0000000000000000 0:0:0:0 slxosdev2:~ # lszfcp -D 0.0.0400/0x50000972081ca531/0x0000000000000000 0:0:1:0 With NPIV, the wwpn and LUN that the guest “sees” are the same. From: Thang Pham [mailto:[email protected]] Sent: Tuesday, April 23, 2013 11:04 AM To: xCAT Users Mailing list Cc: xCAT Users Mailing list Subject: Re: [xcat-user] How does xCAT deal with NPIV provisioned LUNs? I do not see any problem with this. A unique disk is determined by a combination of LUN and WWPN. As long as those values are specified as 16 byte characters, you should be good. Regards, ------------------------------------- Thang Pham IBM Poughkeepsie Phone: (845) 433-7567 e-mail: [email protected]<mailto:[email protected]> [Inactive hide details for "Will, Chris" ---04/23/2013 11:01:26 AM---We have implemented NPIV with our EMC storage array. It lo]"Will, Chris" ---04/23/2013 11:01:26 AM---We have implemented NPIV with our EMC storage array. It looks like xCAT is maintaining a pool of zf From: "Will, Chris" <[email protected]<mailto:[email protected]>> To: xCAT Users Mailing list <[email protected]<mailto:[email protected]>>, Date: 04/23/2013 11:01 AM Subject: [xcat-user] How does xCAT deal with NPIV provisioned LUNs? ________________________________ We have implemented NPIV with our EMC storage array. It looks like xCAT is maintaining a pool of zfcp devices but all of our servers have their LUN addressing staring at “0000”. Is this a problem with implementing zfcp with xCAT? 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