On Thu, Aug 22, 2013 at 03:32:35PM +0200, raj kumar wrote: > ceph cluster is running fine in centos6.4. > Now I would like to export the block device to client using rbd. > my question is, > 1. I used to modprobe rbd in one of the monitor host. But I got error, > FATAL: Module rbd not found > I could not find rbd module. How can i do this? # cat /etc/centos-release CentOS release 6.4 (Final) # updatedb # locate rbd.ko /lib/modules/3.8.13/kernel/drivers/block/rbd.ko # locate virtio_blk.ko /lib/modules/2.6.32-358.14.1.el6.x86_64/kernel/drivers/block/virtio_blk.ko /lib/modules/2.6.32-358.el6.x86_64/kernel/drivers/block/virtio_blk.ko /lib/modules/3.8.13/kernel/drivers/block/virtio_blk.ko Well, the standard CentOS-6.4 kernel does not include 'rbd.ko'. For some reasons the 'Enterprise distros' (RHEL, SLES) disabled the Ceph Kernel components by default, although the CephFS (= ceph.ko) is in the upstream Kernel until 2.6.34, and the Block-Device (= rbd.ko) until 2.6.37. We build our own Kernel 3.8.13 (a good mixture of recent & muture) and put it into CentOS-6.4. > 2. Once the rbd is created. Do we need to create iscsi target in one of a > monitor host and present the lun to client. If so what if the monitor host > goes down. so what is the best practice to provide a lun to clients. > thanks This depends on your Client. Using "RADOS - Block-Layer - RBD-Driver - iSCSI-TGT // iSCSI-INI - Client" is a waste of stack overhead. If the client is kvm-qemu you can use "RADOS // librbd - kvm-qemu" or "RADOS // Block-Layer - RBD-Driver - Client" The "//" symbolized the border between Server-nodes and client-nodes. -Dieter > Raj > _______________________________________________ > 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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