... additionally, the forthcoming 4.12 kernel release will support non-cooperative exclusive locking. By default, since 4.9, when the exclusive-lock feature is enabled, only a single client can write to the block device at a time -- but they will cooperatively pass the lock back and forth upon write request. With the new "rbd map" option, you can map a image on exactly one host and prevent other hosts from mapping the image. If that host should die, the exclusive-lock will automatically become available to other hosts for mapping.
Of course, I always have to ask the use-case behind mapping the same image on multiple hosts. Perhaps CephFS would be a better fit if you are trying to serve out a filesystem? On Wed, Jun 28, 2017 at 6:25 PM, Maged Mokhtar <mmokh...@petasan.org> wrote: > On 2017-06-28 22:55, li...@marcelofrota.info wrote: > > Hi People, > > I am testing the new enviroment, with ceph + rbd with ubuntu 16.04, and i > have one question. > > I have my cluster ceph and mount the using the comands to ceph in my linux > enviroment : > > rbd create veeamrepo --size 20480 > rbd --image veeamrepo info > modprobe rbd > rbd map veeamrepo > rbd feature disable veeamrepo exclusive-lock object-map fast-diff > deep-flatten > mkdir /mnt/veeamrepo > mount /dev/rbd0 /mnt/veeamrepo > > The comands work fine, but i have one problem, in the moment, i can mount > the /mnt/veeamrepo in the same time in 2 machines, and this is a bad option > for me in the moment, because this could generate one filesystem corrupt. > > I need only one machine to be allowed to mount and write at a time. > > Example if machine1 mount the /mnt/veeamrepo and machine2 try mount, one > error would be displayed, show message the machine can not mount, because > the system already mounted in machine1. > > Someone, could help-me with this or give some tips, for solution my > problem. ? > > Thanks a lot > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > You can use Pacemaker to map the rbd and mount the filesystem on 1 server > and in case of failure switch to another server. > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -- Jason
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