Thank you Sir. I appreciate your help on this.
I upgraded the kernel to 3.4.53-8.
For second point, I want to give a client(which is not kvm) a block storage. So without iscsi how the client will access the ceph cluster and allocated block device. and can you please let me know the flow to provision the block storage. creating rbd image and map in one of the mon host is right? the ceph doc is not very clear on this.
Regards
Raj
On Fri, Aug 23, 2013 at 4:03 PM, Kasper Dieter <dieter.kasper@xxxxxxxxxxxxxx> wrote:
On Thu, Aug 22, 2013 at 03:32:35PM +0200, raj kumar wrote:# cat /etc/centos-release
> 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?
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.
This depends on your Client.
> 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
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
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