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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