I had a similar problem, in my case this was related to multipath, it was not masking the LUNs correctly, it was seeing it multiple times (one per path), and I could not select the LUNs in the oVirt interface.

Once I configured multipath correctly, everything worked like a charm.

Best regards,

--

Eduardo Mayoral.

On 29/03/17 11:30, Lukáš Kaplan wrote:

Hello all,

I did all steps as I described in previous email, but no change. I can't see any  LUN after discovery and login of new iSCSI storage.

(That storage is ok, if I try to connect it to another and older ovirt domain, it is working...)

I tryed it on 3 new iSCSI targets alredy, all have same problem...

Can somebody help me, please?

--
Lukas Kaplan

2017-03-27 16:22 GMT+02:00 Lukáš Kaplan <lkaplan@dragon.cz>:

I did following steps:

 

 - delete target on all initiators (ovirt nodes)

 iscsiadm -m node -T iqn.2017-03.cz.dragon.ovirt.fuvs-sn1:10T -p 10.53.1.201:3260 -u

 iscsiadm -m node -T iqn.2017-03.cz.dragon.ovirt.fuvs-sn1:10T -p 10.53.1.201:3260 -o delete

 

 - stop tgtd on target

 - fill storage by zeroes (dd if=/dev/zero of=/dev/md125 bs=4096 status=progress)

 - start tgtd

 - tried to connect to ovirt (Discovery=ok, Login=ok, but can not see any LUN).

=== After that I ran this commands on one node: ===

[root@fudi-cn1 ~]# iscsiadm -m session -o show

tcp: [1] 10.53.0.10:3260,1 iqn.2017-03.cz.dragon.ovirt:ovirtengine (non-flash)

tcp: [11] 10.53.0.201:3260,1 iqn.2017-03.cz.dragon.ovirt.fudi-sn1:10T (non-flash)

tcp: [12] 10.53.1.201:3260,1 iqn.2017-03.cz.dragon.ovirt.fuvs-sn1:10T (non-flash)

[root@fudi-cn1 ~]# iscsiadm -m discoverydb -P1

SENDTARGETS:

DiscoveryAddress: 10.53.0.201,3260

Target: iqn.2017-03.cz.dragon.ovirt:ovirtengine

        Portal: 10.53.0.201:3260,1

                Iface Name: default

iSNS:

No targets found.

STATIC:

Target: iqn.2017-03.cz.dragon.ovirt.fuvs-sn1:10T

        Portal: 10.53.1.201:3260,1

                Iface Name: default

Target: iqn.2017-03.cz.dragon.ovirt:ovirtengine

        Portal: 10.53.0.10:3260,1

                Iface Name: default

Target: iqn.2017-03.cz.dragon.ovirt.fudi-sn1:10T

        Portal: 10.53.0.201:3260,1

                Iface Name: default

FIRMWARE:

No targets found.

=== On iscsi target: ===

[root@fuvs-sn1 ~]# cat /proc/mdstat 

Personalities : [raid1] [raid6] [raid5] [raid4] 

md125 : active raid6 sdl1[11] sdk1[10] sdj1[9] sdi1[8] sdh1[7] sdg1[6] sdf1[5] sde1[4] sdd1[3] sdc1[2] sdb1[1] sda1[0]

      9766302720 blocks super 1.2 level 6, 512k chunk, algorithm 2 [12/12] [UUUUUUUUUUUU]

      bitmap: 0/8 pages [0KB], 65536KB chunk

...etc...

[root@fuvs-sn1 ~]# cat /etc/tgt/targets.conf 

default-driver iscsi

<target iqn.2017-03.cz.dragon.ovirt.fuvs-sn1:10T>

        # provided devicce as a iSCSI target

        backing-store /dev/md125

        # iSCSI Initiator's IP address you allow to connect

        #initiator-address 10.53.0.0/23

</target>

--
Lukas Kaplan

2017-03-25 12:36 GMT+01:00 Lukas Kaplan <lkaplan@dragon.cz>:

Co muze myslet tim mappingem?

Jinak muzu zkusit ddckem celou storage prepsat nulami.

co ty na to?

Odesláno z iPhonu

Začátek přeposílané zprávy:

Od: Yaniv Kaul <ykaul@redhat.com>
Datum: 24. března 2017 23:25:21 SEČ
Komu: Lukáš Kaplan <lkaplan@dragon.cz>
Kopie: users <users@ovirt.org>
Předmět: Re: [ovirt-users] iSCSI Discovery cannot detetect LUN

On Fri, Mar 24, 2017 at 1:34 PM, Lukáš Kaplan <lkaplan@dragon.cz> wrote:

Hello all,

please do you have some experience with troubleshooting adding of iSCSI domain to ovirt 4.1.1? 

I am chalenging this issue now:

1) I have successfuly installed oVirt 4.1.1 environment with self-hosted engine, 3 nodes and 3 storages (iSCSI Master domain, iSCSI for hosted engine and NFS ISO domain). Everything is working now.

2) But, when I want to add new iSCSI domain, I can discover it, I can login, but I cant see any LUN on that storage. (I had same problem in oVirt 4.1.0, so I made upgrade to 4.1.1)

Are you sure mappings are correct? 

Can you ensure the LUN is empty?

Y.

 

3) Then I tryed to add this storage to another oVirt environment (oVirt 3.6) and there are no problem. I can see LUN on that storage and I can connect it to oVirt.

I tryed to examine vdsm.log, but it is very detailed and unredable for me :-/

Thak you in advance, have a nice day,

--
Lukas Kaplan

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