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:[email protected]]
Sent: Tuesday, December 06, 2011 5:33 PM
To: Eric YH Chen/WHQ/Wistron; [email protected]
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!
>
