>>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? Hi jason, Currently I'm sharing rbd images between multiple webservers vm with ocfs2 on top. They have old kernels, so can't use cephfs for now . some servers have also between 20-30millions files, so I need to test cephfs to see if it can handle between 100-150 millions files (which are handle by 5 rbd images). Can cephfs handle so much files currently ? (I waiting for luminous to test it) ----- Mail original ----- De: "Jason Dillaman" <jdillama@xxxxxxxxxx> À: "Maged Mokhtar" <mmokhtar@xxxxxxxxxxx> Cc: "ceph-users" <ceph-users@xxxxxxxxxxxxxx> Envoyé: Jeudi 29 Juin 2017 02:02:44 Objet: Re: Ceph mount rbd ... 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 < [ mailto:mmokhtar@xxxxxxxxxxx | mmokhtar@xxxxxxxxxxx ] > wrote: On 2017-06-28 22:55, [ mailto:lista@xxxxxxxxxxxxxxxxx | lista@xxxxxxxxxxxxxxxxx ] wrote: BQ_BEGIN 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 [ mailto:ceph-users@xxxxxxxxxxxxxx | ceph-users@xxxxxxxxxxxxxx ] [ http://lists.ceph.com/listinfo.cgi/ceph-users-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 [ mailto:ceph-users@xxxxxxxxxxxxxx | ceph-users@xxxxxxxxxxxxxx ] [ http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com | http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ] BQ_END -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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