You should describe your configuration... krbd? librbd? cephfs? is rbd_cache = true? rbd cache writethrough until flush = true? is it kvm? maybe the filesystem in the VM is relevant (I saw something similar testing cephfs... if I blacklisted a client and then force unmounted, I would get whole files (appended I think) or ends of files (new files) with zeros) On 04/07/17 13:36, Laszlo Budai wrote: > Hello, > > we have observed that there are null characters written into the open > files when hard rebooting a VM. Is tis a known issue? > Our VM is using ceph (0.94.10) storage. > we have a script like this: > while sleep 1; do date >> somefile ; done > > if we hard reset the VM while the above line is running we end up with > NULL characters in the file : > > 00000000 54 68 75 20 41 70 72 20 20 36 20 31 34 3a 33 37 |Thu Apr > 6 14:37| > 00000010 3a 33 33 20 43 45 53 54 20 32 30 31 37 0a 54 68 |:33 CEST > 2017.Th| > 00000020 75 20 41 70 72 20 20 36 20 31 34 3a 33 37 3a 33 |u Apr 6 > 14:37:3| > 00000030 34 20 43 45 53 54 20 32 30 31 37 0a 54 68 75 20 |4 CEST > 2017.Thu | > 00000040 41 70 72 20 20 36 20 31 34 3a 33 37 3a 33 35 20 |Apr 6 > 14:37:35 | > 00000050 43 45 53 54 20 32 30 31 37 0a 54 68 75 20 41 70 |CEST > 2017.Thu Ap| > 00000060 72 20 20 36 20 31 34 3a 33 37 3a 33 36 20 43 45 |r 6 > 14:37:36 CE| > 00000070 53 54 20 32 30 31 37 0a 54 68 75 20 41 70 72 20 |ST > 2017.Thu Apr | > 00000080 20 36 20 31 34 3a 33 37 3a 33 39 20 43 45 53 54 | 6 > 14:37:39 CEST| > 00000090 20 32 30 31 37 0a 54 68 75 20 41 70 72 20 20 36 | 2017.Thu > Apr 6| > 000000a0 20 31 34 3a 33 37 3a 34 30 20 43 45 53 54 20 32 | 14:37:40 > CEST 2| > 000000b0 30 31 37 0a 54 68 75 20 41 70 72 20 20 36 20 31 |017.Thu > Apr 6 1| > 000000c0 34 3a 33 37 3a 34 31 20 43 45 53 54 20 32 30 31 |4:37:41 > CEST 201| > 000000d0 37 0a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > |7...............| > 000000e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > |................| > > We've observed the same in the syslog file also. > > Any thoughts about it? > > kind regards, > Laszlo > _______________________________________________ > 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
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