hi Yan
cephfs client was also on the rebooted host?
NO, the cephfs client is an indepentent vm
13605702596@xxxxxxx
From: Yan, ZhengDate: 2017-12-18 10:36CC: John Spray; ceph-usersSubject: Re: Re: cephfs miss data for 15s when master mds rebootingOn Mon, Dec 18, 2017 at 10:10 AM, 13605702596@xxxxxxx<13605702596@xxxxxxx> wrote:> hi Yan>> 1. run "ceph mds fail" before rebooting host> 2. host reboot by itself for some reason>cephfs client was also on the rebooted host?> you means no data get lost in the BOTH conditions?>> in my test, i echo the date string per second into the file under cephfs> dir,> when i reboot the master mds, there are 15 lines got lost.>> thanks>> ________________________________> 13605702596@xxxxxxx>>> From: Yan, Zheng> Date: 2017-12-18 09:55> To: 13605702596@xxxxxxx> CC: John Spray; ceph-users> Subject: Re: cephfs miss data for 15s when master mds rebooting> On Mon, Dec 18, 2017 at 9:24 AM, 13605702596@xxxxxxx> <13605702596@xxxxxxx> wrote:>> hi John>>>> thanks for your answer.>>>> in normal condition, i can run "ceph mds fiail" before reboot.>> but if the host reboots by itself for some reason, i can do nothing!>> if this happens, data must be losed.>>>> so, is there any other way to stop data from being losed?>>>> no data get lost in this condition. just IO stall for a few seconds>>> thanks>>>> ________________________________>> 13605702596@xxxxxxx>>>>>> From: John Spray>> Date: 2017-12-15 18:08>> To: 13605702596@xxxxxxx>> CC: ceph-users>> Subject: Re: cephfs miss data for 15s when master mds>> rebooting>> On Fri, Dec 15, 2017 at 1:45 AM, 13605702596@xxxxxxx>> <13605702596@xxxxxxx> wrote:>>> hi>>>>>> i used 3 nodes to deploy mds (each node also has mon on it)>>>>>> my config:>>> [mds.ceph-node-10-101-4-17]>>> mds_standby_replay = true>>> mds_standby_for_rank = 0>>>>>> [mds.ceph-node-10-101-4-21]>>> mds_standby_replay = true>>> mds_standby_for_rank = 0>>>>>> [mds.ceph-node-10-101-4-22]>>> mds_standby_replay = true>>> mds_standby_for_rank = 0>>>>>> the mds stat:>>> e29: 1/1/1 up {0=ceph-node-10-101-4-22=up:active}, 1 up:standby-replay, 1>>> up:standby>>>>>> i mount the cephfs on the ceph client, and run the test script to write>>> data>>> into file under the cephfs dir,>>> when i reboot the master mds, and i found the data is not written into>>> the>>> file.>>> after 15 seconds, data can be written into the file again>>>>>> so my question is:>>> is this normal when reboot the master mds?>>> when will the up:standby-replay mds take over the the cephfs?>>>> The standby takes over after the active daemon has not reported to the>> monitors for `mds_beacon_grace` seconds, which as you have noticed is>> 15s by default.>>>> If you know you are rebooting something, you can pre-empt the timeout>> mechanism by using "ceph mds fail" on the active daemon, to cause>> another to take over right away.>>>> John>>>>> thanks>>>>>> ________________________________>>> 13605702596@xxxxxxx>>>>>> _______________________________________________>>> ceph-users mailing list>>> ceph-users@xxxxxxxxxxxxxx>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com>>>>>>>>> _______________________________________________>> ceph-users mailing list>> ceph-users@xxxxxxxxxxxxxx>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com>>
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
