The two luns are unique obviously, but the lun address that linux sees can be the same. For example, here is a typical lun assignment for two guests.
Server LUN address LUN mapping address
LUN label Server WWPN
SERVER1 0000000000000000 0030000000000000
296f C05076F47B8007B0
SERVER2 0000000000000000 0031000000000000
2973 C05076F47B8007B4
Chris
From: Chuck Brazie [mailto:[email protected]]
Sent: Friday, April 26, 2013 8:15 AM
To: xCAT Users Mailing list
Subject: Re: [xcat-user] How does xCAT deal with NPIV provisioned LUNs?
I am confused as to what you are adding. The WWPN is unique to the storage
controller port, so why would you expect the second command using the same WWPN
and LUN to work?
Chuck Brazie
[email protected]<mailto:[email protected]>
From: "Will, Chris" <[email protected]<mailto:[email protected]>>
To: xCAT Users Mailing list
<[email protected]<mailto:[email protected]>>,
Date: 04/25/2013 01:22 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?
Chris Will
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