Hello, On Mon, 15 Dec 2014 02:39:25 +0000 riywo wrote: > Hi ceph users, > > I'm a new user of ceph, just POC-ing for a shred file system. I'm > struggling that a file on top of a same image of RBD is not synced > between two machines. > You're looking for a shared filesystem (like NFS, CephFS), but RBD (like DRBD, or iSCSI) provides replicated, shared BLOCK devices. You need to either run a cluster aware filesystem like ocfs2 on top of the block device or use CephFS. > I've just setup a ceph cluster (giant on ubuntu14.04), one mon on > machine1 and one osd on machine2, created a image(foo) and > mapped/mounted the image on two machines like below. > > machine1$ mount > /dev/rbd1 on /mnt/foo type ext4 (rw,sync,_netdev) > machine2$ mount > /dev/rbd1 on /mnt/foo type ext4 (rw,sync,_netdev) > > Then, I've just touched a file(/mnt/foo/bar) on machine1, but it didn't > appear on machine2 even I waited for a few minutes. > > machine1$ sudo touch /mnt/foo/bar > machine1$ ls -l /mnt/foo > -rw-r--r-- 1 root root 0 Dec 15 01:35 bar > drwx------ 2 root root 16384 Dec 12 16:05 lost+found > machine2$ ls -l /mnt/foo > drwx------ 2 root root 16384 Dec 12 16:05 lost+found > > Though, it appeared after flushing block device buffers. > > machine1$ sudo blockdev --flushbufs /dev/rbd1 > machine2$ sudo blockdev --flushbufs /dev/rbd1 > machine2$ ls -l /mnt/foo > -rw-r--r-- 1 root root 0 Dec 15 01:35 bar > drwx------ 2 root root 16384 Dec 12 16:05 lost+found > > Am I wrong something? Are there something to be configured? Is it > impossible to use RBD as a shared network block device? > Shared block device != shared file system. Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |