Re: [ceph-users] two mount points, two diffrent data
Because you are not using a cluster aware filesystem - the respective mounts don't know when changes are made to the underlying block device (rbd) by the other mount. What you are doing *will* lead to file corruption. Your need to use a distributed filesystem such as GFS2 or cephfs. CephFS would be probably be the easiest to setup. Thanks for help I use cephfs and it's working great ! ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] two mount points, two diffrent data
On 14.01.2015 14:20, Rafał Michalak wrote: #node1 mount /dev/rbd/rbd/test /mnt #node2 mount /dev/rbd/rbd/test /mnt If you want to mount a filesystem on one block device onto multiple clients, the filesystem has to be clustered, e.g. OCFS2. A normal local filesystem like ext4 or XFS is not aware that other clients may alter the underlying block device. This is a sure receipt for data corruption and loss. Maybe you should look at CephFS. Regards -- Robert Sander Heinlein Support GmbH Schwedter Str. 8/9b, 10119 Berlin http://www.heinlein-support.de Tel: 030 / 405051-43 Fax: 030 / 405051-19 Zwangsangaben lt. §35a GmbHG: HRB 93818 B / Amtsgericht Berlin-Charlottenburg, Geschäftsführer: Peer Heinlein -- Sitz: Berlin signature.asc Description: OpenPGP digital signature ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] two mount points, two diffrent data
On Wed, 14 Jan 2015 02:20:21 PM Rafał Michalak wrote: Why data not replicating on mounting fs ? I try with filesystems ext4 and xfs The data is visible only when unmounted and mounted again Because you are not using a cluster aware filesystem - the respective mounts don't know when changes are made to the underlying block device (rbd) by the other mount. What you are doing *will* lead to file corruption. Your need to use a distributed filesystem such as GFS2 or cephfs. CephFS would be probably be the easiest to setup. ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] two mount points, two diffrent data
You’re using a file system on 2 hosts that is not cluster aware. Metadata written on hosta is not sent to hostb in this case. You may be interested in looking at cephfs for this use case. Michael Kuriger mk7...@yp.com 818-649-7235 MikeKuriger (IM) From: Rafał Michalak rafa...@gmail.commailto:rafa...@gmail.com Date: Wednesday, January 14, 2015 at 5:20 AM To: ceph-users@lists.ceph.commailto:ceph-users@lists.ceph.com ceph-users@lists.ceph.commailto:ceph-users@lists.ceph.com Subject: [ceph-users] two mount points, two diffrent data Hello I have trouble with this situation #node1 mount /dev/rbd/rbd/test /mnt cd /mnt touch test1 ls (i see test1, OK) #node2 mount /dev/rbd/rbd/test /mnt cd /mnt (i see test1, OK) touch test2 ls (i see test2, OK) #node1 ls (i see test1, BAD) touch test3 ls (i see test1, test3 BAD) #node2 ls (i see test1, test2 BAD) Why data not replicating on mounting fs ? I try with filesystems ext4 and xfs The data is visible only when unmounted and mounted again I check health in ceph status and is HEALTH_OK What I doing wrong ? Thanks for any help. My system Ubuntu 14.04.01 LTS #ceph --version ceph version 0.80.7 (6c0127fcb58008793d3c8b62d925bc91963672a3) #modinfo libceph filename: /lib/modules/3.13.0-44-generic/kernel/net/ceph/libceph.ko license: GPL description:Ceph filesystem for Linux author: Patience Warnick patie...@newdream.netmailto:patie...@newdream.net author: Yehuda Sadeh yeh...@hq.newdream.netmailto:yeh...@hq.newdream.net author: Sage Weil s...@newdream.netmailto:s...@newdream.net srcversion: B8E83D4DFC53B113603CF52 depends:libcrc32c intree:Y vermagic: 3.13.0-44-generic SMP mod_unload modversions signer: Magrathea: Glacier signing key sig_key: 50:8C:3B:4B:F1:08:ED:36:B6:06:2F:81:27:82:F7:7C:37:B9:85:37 sig_hashalgo: sha512 ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
[ceph-users] two mount points, two diffrent data
Hello I have trouble with this situation #node1 mount /dev/rbd/rbd/test /mnt cd /mnt touch test1 ls (i see test1, OK) #node2 mount /dev/rbd/rbd/test /mnt cd /mnt (i see test1, OK) touch test2 ls (i see test2, OK) #node1 ls (i see test1, BAD) touch test3 ls (i see test1, test3 BAD) #node2 ls (i see test1, test2 BAD) Why data not replicating on mounting fs ? I try with filesystems ext4 and xfs The data is visible only when unmounted and mounted again I check health in ceph status and is HEALTH_OK What I doing wrong ? Thanks for any help. My system Ubuntu 14.04.01 LTS #ceph --version ceph version 0.80.7 (6c0127fcb58008793d3c8b62d925bc91963672a3) #modinfo libceph filename: /lib/modules/3.13.0-44-generic/kernel/net/ceph/libceph.ko license: GPL description:Ceph filesystem for Linux author: Patience Warnick patie...@newdream.net author: Yehuda Sadeh yeh...@hq.newdream.net author: Sage Weil s...@newdream.net srcversion: B8E83D4DFC53B113603CF52 depends:libcrc32c intree:Y vermagic: 3.13.0-44-generic SMP mod_unload modversions signer: Magrathea: Glacier signing key sig_key: 50:8C:3B:4B:F1:08:ED:36:B6:06:2F:81:27:82:F7:7C:37:B9:85:37 sig_hashalgo: sha512 ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
