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