Hi Christian, Thanks! I completely understood what I want :)
I'll try to use CephFS. Best, Ryosuke On Mon Dec 15 2014 at 12:17:12 PM Christian Balzer <ch...@gol.com> wrote: > > 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 > ch...@gol.com Global OnLine Japan/Fusion Communications > http://www.gol.com/ >
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