can you please give the output of:
multipath -ll
and
iscsiadm -m session -P3

JP

2017-05-13 6:48 GMT-03:00 Stefano Bovina <bov...@gmail.com>:

> Hi,
>
> 2.6.32-696.1.1.el6.x86_64
> 3.10.0-514.10.2.el7.x86_64
>
> I tried ioping test from different group of servers using multipath,
> members of different storage group (different lun, different raid ecc), and
> everyone report latency.
> I tried the same test (ioping) on a server with powerpath instead of
> multipath, with a dedicated raid group and ioping don't report latency.
>
>
> 2017-05-13 2:00 GMT+02:00 Juan Pablo <pablo.localh...@gmail.com>:
>
>> sorry to jump in, but what kernel version are you using? had similar
>> issue with kernel 4.10/4.11
>>
>>
>> 2017-05-12 16:36 GMT-03:00 Stefano Bovina <bov...@gmail.com>:
>>
>>> Hi,
>>> a little update:
>>>
>>> The command multipath -ll hung when executed on the host while the
>>> problem occur (nothing logged in /var/log/messages or dmesg).
>>>
>>> I tested latency with ioping:
>>> ioping /dev/6a386652-629d-4045-835b-21d2f5c104aa/metadata
>>>
>>> Usually it return "time=15.6 ms", sometimes return "time=19 s" (yes,
>>> seconds)
>>>
>>> Systems are up to date and I tried both path_checker (emc_clariion and
>>> directio), without results.
>>> (https://access.redhat.com/solutions/139193, it refers to the Rev A31
>>> of EMC document; last is A42 and suggest emc_clariion).
>>>
>>> Any idea or suggestion?
>>>
>>> Thanks,
>>>
>>> Stefano
>>>
>>> 2017-05-08 11:56 GMT+02:00 Yaniv Kaul <yk...@redhat.com>:
>>>
>>>>
>>>>
>>>> On Mon, May 8, 2017 at 11:50 AM, Stefano Bovina <bov...@gmail.com>
>>>> wrote:
>>>>
>>>>> Yes,
>>>>> this configuration is the one suggested by EMC for EL7.
>>>>>
>>>>
>>>> https://access.redhat.com/solutions/139193 suggest that for alua, the
>>>> patch checker needs to be different.
>>>>
>>>> Anyway, it is very likely that you have storage issues - they need to
>>>> be resolved first and I believe they have little to do with oVirt at the
>>>> moment.
>>>> Y.
>>>>
>>>>
>>>>>
>>>>> By the way,
>>>>> "The parameters rr_min_io vs. rr_min_io_rq mean the same thing but are
>>>>> used for device-mapper-multipath on differing kernel versions." and
>>>>> rr_min_io_rq default value is 1, rr_min_io default value is 1000, so it
>>>>> should be fine.
>>>>>
>>>>>
>>>>> 2017-05-08 9:39 GMT+02:00 Yaniv Kaul <yk...@redhat.com>:
>>>>>
>>>>>>
>>>>>> On Sun, May 7, 2017 at 1:27 PM, Stefano Bovina <bov...@gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Sense data are 0x0/0x0/0x0
>>>>>>
>>>>>>
>>>>>> Interesting - first time I'm seeing 0/0/0. The 1st is usually 0x2
>>>>>> (see [1]), and then the rest [2], [3] make sense.
>>>>>>
>>>>>> A google search found another user with Clarion with the exact same
>>>>>> error[4], so I'm leaning toward misconfiguration of multipathing/clarion
>>>>>> here.
>>>>>>
>>>>>> Is your multipathing configuration working well for you?
>>>>>> Are you sure it's a EL7 configuration? For example, I believe you
>>>>>> should have rr_min_io_rq and not rr_min_io .
>>>>>> Y.
>>>>>>
>>>>>> [1] http://www.t10.org/lists/2status.htm
>>>>>> [2] http://www.t10.org/lists/2sensekey.htm
>>>>>> [3] http://www.t10.org/lists/asc-num.htm
>>>>>> [4] http://www.linuxquestions.org/questions/centos-111/multi
>>>>>> path-problems-4175544908/
>>>>>>
>>>>>
>>>>>
>>>>
>>>
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>>>
>>>
>>
>
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