Nux, Thanks for the explanation, in case of clvm, what will be the ip field of primary storage? Same as kvm host up? On Apr 24, 2014 5:02 PM, "Nux!" <n...@li.nux.ro> wrote:
> On 25.04.2014 00:40, rammohan ganapavarapu wrote: > >> One more question, if i have a NAS and i have presented raw LUN to all my >> kvm hosts using iscsi, do i still need to setup clvm or can i just use >> iscsi target and cloudstack will use it as primary storage? >> >> I am getting confused with this clvm/shared mount, in cloudstack 4.3 for >> kvm hyperviser do i really need to setup clvm or shared mount? instead can >> i directly give storage device ip for primary storage configuration of >> course all my kvm hosts can talk to storage and can see iscsi LUN? >> > > Hello, > > CLVM is a way of using a network block device (eg iSCSI LUN) in a > cluster-aware manner so you don't end up having multiple nodes using the > same LVM volumes or updating LVM metadata and corrupting it. What it does > is makes all nodes aware of the fact that the volume group on top of that > LUN is used on multiple machines and the cluster software must be consulted > before using it to make sure it's not used elsewhere. > > Shared Mount is a powerful option that enables you to use a filesystem > that can be shared between nodes, e.g. you can take the above LUN and > instead of "formatting" as CLVM you can put OCFS2 or GFS2 on top of it and > use it like a clustered filesystem. Be advised this will probably be more > complex to set up than CLVM and also less performant. > Another example of using Shared Mount is mounting a GlusterFS volume as > data stor, or CephFS, or XtreemFS or pretty much any network/cluster > filesystem out there, if KVM can run off a qcow2 file off it then it's good > enough for Cloudstack. > > How you would do it in practice is very simple: > - on all hypervisors mount the desired filesystem/mounpoint in a path, > e.g. /mnt/glusterfs, make sure it's writable etc > - add the Primary Storage as Shared Mount point and when asked about the > path input "/mnt/glusterfs" > > HTH > Lucian > > -- > Sent from the Delta quadrant using Borg technology! > > Nux! > www.nux.ro >
