Looks like I have similar issue as described in this bug: http://tracker.ceph.com/issues/15255 Writer (dd in my case) can be restarted and then writing continues, but until restart dd looks like hanged on write.
> 20 июля 2017 г., в 16:12, Дмитрий Глушенок <gl...@jet.msk.su> написал(а): > > Hi, > > Repeated the test using kernel 4.12.0. OSD node crash seems to be handled > fine now, but MDS crash still leads to hanged writes to CephFS. Now it was > enough just to crash the first MDS - failover didn't happened. At the same > time FUSE client was running on another client - no problems with it. > >> 19 июля 2017 г., в 13:20, Дмитрий Глушенок <gl...@jet.msk.su >> <mailto:gl...@jet.msk.su>> написал(а): >> >> You right. Forgot to mention that the client was using kernel 4.9.9. >> >>> 19 июля 2017 г., в 12:36, 许雪寒 <xuxue...@360.cn <mailto:xuxue...@360.cn>> >>> написал(а): >>> >>> Hi, thanks for your sharing:-) >>> >>> So I guess you have not put cephfs into real production environment, and >>> it's still in test phase, right? >>> >>> Thanks again:-) >>> >>> 发件人: Дмитрий Глушенок [mailto:gl...@jet.msk.su <mailto:gl...@jet.msk.su>] >>> 发送时间: 2017年7月19日 17:33 >>> 收件人: 许雪寒 >>> 抄送: ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> >>> 主题: Re: [ceph-users] How's cephfs going? >>> >>> Hi, >>> >>> I can share negative test results (on Jewel 10.2.6). All tests were >>> performed while actively writing to CephFS from single client (about 1300 >>> MB/sec). Cluster consists of 8 nodes, 8 OSD each (2 SSD for journals and >>> metadata, 6 HDD RAID6 for data), MON/MDS are on dedicated nodes. 2 MDS at >>> all, active/standby. >>> - Crashing one node resulted in write hangs for 17 minutes. Repeating the >>> test resulted in CephFS hangs forever. >>> - Restarting active MDS resulted in successful failover to standby. Then, >>> after standby became active and the restarted MDS became standby the new >>> active was restarted. CephFS hanged for 12 minutes. >>> >>> P.S. Planning to repeat the tests again on 10.2.7 or higher >>> >>> 19 июля 2017 г., в 6:47, 许雪寒 <xuxue...@360.cn <mailto:xuxue...@360.cn>> >>> написал(а): >>> >>> Is there anyone else willing to share some usage information of cephfs? >>> Could developers tell whether cephfs is a major effort in the whole ceph >>> development? >>> >>> 发件人: 许雪寒 >>> 发送时间: 2017年7月17日 11:00 >>> 收件人: ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> >>> 主题: How's cephfs going? >>> >>> Hi, everyone. >>> >>> We intend to use cephfs of Jewel version, however, we don’t know its >>> status. Is it production ready in Jewel? Does it still have lots of bugs? >>> Is it a major effort of the current ceph development? And who are using >>> cephfs now? >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com> >>> >>> -- >>> Dmitry Glushenok >>> Jet Infosystems >>> >> >> -- >> Дмитрий Глушенок >> Инфосистемы Джет >> +7-910-453-2568 >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -- > Дмитрий Глушенок > Инфосистемы Джет > +7-910-453-2568 > -- Dmitry Glushenok Jet Infosystems
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