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.
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?
Thanks,
Ryosuke
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