[ovirt-users] High latency on storage domains and sanlock renewal error

[Juan Pablo]

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 <bovy89 at 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 <ykaul at redhat.com>:
>
>>
>>
>> On Mon, May 8, 2017 at 11:50 AM, Stefano Bovina <bovy89 at 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 <ykaul at redhat.com>:
>>>
>>>>
>>>> On Sun, May 7, 2017 at 1:27 PM, Stefano Bovina <bovy89 at 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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