Hi, Wido: This is a preliminary experiment before implement iSCSI High Available multipath. http://ceph.newdream.net/wiki/ISCSI Therefore, we use Ceph as rbd device instead of file system. -----Original Message----- From: Wido den Hollander [mailto:wido@xxxxxxxxx] Sent: Tuesday, December 06, 2011 5:33 PM To: Eric YH Chen/WHQ/Wistron; ceph-devel@xxxxxxxxxxxxxxx Cc: Chris YT Huang/WHQ/Wistron Subject: Re: How to sync data on different server but with the same image Hi, ----- Original message ----- > Dear All: > > I map the same rbd image to the rbd device on two different servers. > > For example: > 1. create rbd image named foo > 2. map foo to /dev/rbd0 on server A, mount /dev/rbd0 to /mnt > 3. map foo to /dev/rbd0 on server B, mount /dev/rbd0 to /mnt > > If I put add a file to /mnt via server A, I hope I can see the same > file on server B. > However, I can't see it until I umount /mnt on server A and re-mount > /mnt on server B. You'd have to use an cluster filesystem like GFS or OCFS2 to let this work. But why not use Ceph as a filesystem instead of RBD? That seems to do what you want. Wido > > Do you have any comment about this scenario? How could I force the > data synchronization? > > Actually, I want to implement the iSCSI High Available multipath on > http://ceph.newdream.net/wiki/ISCSI. > Therefore, I tried this small experiment first, but fail. Would you > please give me some suggestion before I start to implement it? Thanks! > ��.n��������+%������w��{.n����z��u���ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
