On 05/13/2015 12:48 AM, Tomasz Charoński wrote:
Dear Andy Grover, targetcli-fb Developers,
firstly, I'd like to thank you for your contribution in targetcli and
related libraries developing. I am writing to you to ask, if there it is
possible to add to targetcli qla2xxx_npiv support. I have been studying
this for 2 days now and it's hard to create NPIV targets manually.
Hi Tomasz!
I would hope we could add this and make it easier. I think some
challenges will be I don't have hardware to develop on, at least not
full-time, and also NPIV is a feature not represented in targetcli
before now. Some thought on how best to present it will be needed, see
below.
To create NPIV WWN using qla2xxx you need:
1. Create FC host using vport_create:
echo '1111222233334444:5555666677778888' >
/sys/class/fc_host/host5/vport_create
After this new /sys/class/fc_host/hostX will appear, but NPIV WWN is not
discovered at FC switch yet.
2. Create the path:
/sys/kernel/config/target/qla2xxx_npiv/21:00:00:xx:xx:xx:xx:11@5555666677778888:1111222233334444
where "21:00:00:xx:xx:xx:xx:11" is physical WWN taken from port_name
(sed needed).
Even though qla2xxx and qla2xxx_npiv are not represented hierarchically
in configfs (they're peers) I'm wondering if that's not actually a
mistake, and preferable to present differently in targetcli. It might be
clearer to show it hierarchically -- create an "npivs" node:
qla2xxx
o- 20:00:00:00:00:00:00:55
o- acls
o- luns
o- npivs
in which "npivs/ create 5555666677778888 npiv_wwnn=1111222233334444"
would actually jump over to the qla2xxx_npiv configfs dir and set stuff up.
and then that would have its own "acls" and "luns" nodes too:
qla2xxx
o- 20:00:00:00:00:00:00:55
o- acls
o- luns
o- npivs
o- 5555666677778888
o- acls
o- luns
**OR**
the phys wwpn node (e.g. "20:00..") could have a create_npiv command, e.g.:
00:55>/ create_npiv 5555666677778888 npiv_wwnn=1111222233334444"
leading to:
qla2xxx
o- 20:00:00:00:00:00:00:55
o- acls
o- luns
qla2xxx_npiv
o- 5555666677778888 [parent: 20:00:00:00:00:00:00:55]
o- acls
o- luns
my thoughts are to prefer the first way. It would be more work for the
way tcm_qla2xxx implements NPIV but assuming LIO gets more FC fabrics in
the future, I'm not sure we'd want them to do npiv like qla2xxx did.
3. qla2xxx_npiv directory seems to be the same as
/sys/kernel/config/target/qla2xxx. After enabling tgpt_1 I can see
"5555666677778888" at FC switch, however I can't successfuly share the
LUN with an initiator.
Have you created an ACL and lun mapping for that initiator? If that
doesn't fix it then I don't know.
NPIV WWNs are needed to make user-friendly failover between hosts.
I am eager to help you in this development, especially including testing
this functionality in our infrastructure.
Great! :-)
Thanks -- Regards -- Andy
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