[ovirt-users] iSCSI Discovery cannot detetect LUN
Lukáš Kaplan
lkaplan at dragon.cz
Fri Mar 31 12:43:02 UTC 2017
I solved this issue now.
I thought till today, that iSCSI LUN ID (WWN or WWID) is globaly unique. It
is not true!
If you power on two identical linux machines and create iSCSI target on
them, their LUN IDs will be same...
360000000000000000e00000000010001 - for first LUN
360000000000000000e00000000010002 - for second LUN etc
You have to change LUN ID manualy (and take care of that uniqueness in your
domain) in /etc/tgtd/targets.conf for example:
<target iqn.2017-03.com.example.domain>
<backing-store /dev/md124>
scsi_id 00020001
</backing-store>
<backing-store /dev/md125>
scsi_id 00020002
</backing-store>
initiator-address 192.168.1.0/24
</target>
--
Lukas Kaplan
2017-03-31 9:06 GMT+02:00 Lukáš Kaplan <lkaplan at dragon.cz>:
> Is it possible that problem can be in conflicting LUN IDs?
> I see that first LUN from both storage servers have same LUN ID
> 360000000000000000e00000000010001. One storage server is connected to
> ovirt and second is not connected because of described problem (ovirt dont
> show lun after login and discovery).
>
> I am using tgtd as iscsi target server on both servers. Both have same
> configuration (same disks, md raid6), but different iqn and ip address...
>
> --
> Lukas Kaplan
>
> Dragon Internet a.s.
>
> 2017-03-29 12:12 GMT+02:00 Liron Aravot <laravot at redhat.com>:
>
>>
>>
>> On Wed, Mar 29, 2017 at 12:59 PM, Eduardo Mayoral <emayoral at arsys.es>
>> wrote:
>>
>>> 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
>>>
>>>
>> Hi Lukas,
>> If you try to perform the discovery yourself, do you see the luns?
>>
>>>
>>>
>>> 2017-03-27 16:22 GMT+02:00 Lukáš Kaplan <lkaplan at 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 at 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 at 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 at 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 at 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 at 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 at redhat.com>
>>>>> *Datum:* 24. března 2017 23:25:21 SEČ
>>>>> *Komu:* Lukáš Kaplan <lkaplan at dragon.cz>
>>>>> *Kopie:* users <users at ovirt.org>
>>>>> *Předmět:* *Re: [ovirt-users] iSCSI Discovery cannot detetect LUN*
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Mar 24, 2017 at 1:34 PM, Lukáš Kaplan <lkaplan at 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
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Users mailing list
>>>>>> Users at ovirt.org
>>>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>>
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>
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