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<p>Going directly to RBD layer will be used once you use ceph as IMAGE datastore. Nebula will be interfacing directly with ceph and your images will be in RBD format.This is already the "direct way". This is the same things as using KVM with ceph RBD.</p>
<p>The only thing you may want to use is the cephfs (which is not RBD) is when you use it for the SYSTEM datastore and use shared for TM. This is what I use. Besides, system datastore does't contain a lot of files so if this method is inefficient, I won't notice it all.</p>
<p>But if you also want to use RBD for the system datastore, you can still use it. You just mount an RBD image in the /var/lib/datastore/0/ of you nodes.</p>
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<pre><span style="font-size: small; font-family: verdana,geneva;"><span style="font-size: x-small; font-family: helvetica; color: #000000;">Thanks,
Kenneth</span><br /><span style="font-size: x-small; font-family: helvetica; color: #000000;">Apollo Global Corp.</span><br /></span></pre>
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<p>On 12/04/2013 04:08 PM, Mario Giammarco wrote:</p>
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<div>I have read all posts of this interesting thread.</div>
You suggest to use ceph as a shared filesystem and it is a good idea I agree.<br /><br /></div>
But I supposed that, because kvm supports ceph rbd and because opennebula supports ceph, there is a "direct way" to use it. </div>
I mean not using ceph DFS layer and going directly to rbd layer (also for system datastore)</div>
I do not understand what advantages has opennebula actual ceph support, can you explain to me?<br /><br />Thanks,</div>
Mario</div>
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<div class="gmail_quote">2013/12/3 Jaime Melis <span><<a href="mailto:jmelis@c12g.com">jmelis@c12g.com</a>></span><br />
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<div dir="ltr">Hi Mario,
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<div>Cephfs CAN be used a shared filesystem datastore. I don't completely agree with Kenneth's recommendation of using 'ssh' as the TM for the system datastore. I think you can go for 'shared' as long as you have the /var/lib/one/datastores/... shared via Cephfs. OpenNebula doesn't care about what DFS solution you're using, it will simply assume files are already there.</div>
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<div>Another thing worth mentioning, from 4.4 onwards the HOST attribute of the datastore should be renamed as BRIDGE_LIST.</div>
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<div>cheers,<br />Jaime</div>
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<div class="h5">On Tue, Dec 3, 2013 at 11:28 AM, Kenneth <span><<a href="mailto:kenneth@apolloglobal.net">kenneth@apolloglobal.net</a>></span> wrote:</div>
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<p>Actually, I'm using ceph as the system datastore. I used the cephfs (CEPH FUSE) and mounted it on all nodes on /var/lib/one/datastores/0/</p>
<p>Regarding ssh for trasfer driver, I haven't really used it since I'm all on ceph, both system and image datastore. I may be wrong but that is how I understand it from the docs.</p>
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<pre><span style="font-size: small; font-family: verdana,geneva;"><span style="font-size: x-small; font-family: helvetica;">Thanks,
Kenneth</span><br /><span style="font-size: x-small; font-family: helvetica;">Apollo Global Corp.</span><br /></span></pre>
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<p>On 12/03/2013 06:11 PM, Mario Giammarco wrote:</p>
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<div>My problem was that because ceph is a distributed filesystem (and so it can be used as an alternative to nfs) I supposed I can use as a shared system datastore.</div>
Reading your reply I can see it is not true. Probably official documentation should clarify this.<br /><br /></div>
Infact I hoped to use ceph as system datastore because ceph is fault tolerant and nfs is not.<br /><br /></div>
Thanks for help,</div>
Mario</div>
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<div class="gmail_quote">2013/12/3 Kenneth <span><<a href="mailto:kenneth@apolloglobal.net">kenneth@apolloglobal.net</a>></span><br />
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<p>Ceph won't be the default image datastore, but you can always choose it whenever you create an image.</p>
<p>You said you don't have an NFS disk and your just use plain disk on your system datastore so you <strong>should</strong> use ssh in order to have live migrations.</p>
<p>Mine uses shared as datastore since I mounted a shared folder on each nebula node.</p>
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<pre><span style="font-size: small; font-family: verdana,geneva;"><span style="font-size: x-small; font-family: helvetica;">Thanks,
Kenneth</span><br /><span style="font-size: x-small; font-family: helvetica;">Apollo Global Corp.</span><br /></span></pre>
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<p>On 12/03/2013 03:01 PM, Mario Giammarco wrote:</p>
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<div dir="ltr">First, thanks you for your very detailed reply!<br />
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<div class="gmail_quote">2013/12/3 Kenneth <span><<a href="mailto:kenneth@apolloglobal.net">kenneth@apolloglobal.net</a>></span><br />
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<p>You don't need to replace existing datastores, the important is you edit the system datastore as "ssh" because you still need to transfer files in each node when you deploy a VM.</p>
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<div>So I lose live migration, right?</div>
<div>If I understand correctly ceph cannot be default datastore also.</div>
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<p>Next, you should make sure that all your node are able to communicate with the ceph cluster. Issue the command "ceph -s" on all nodes including the front end to be sure that they are connected to ceph.</p>
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<div>... will check...</div>
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<p>oneadmin@cloud-node1:~$ onedatastore list</p>
<p><span style="font-family: courier new,courier;"> ID NAME SIZE AVAIL CLUSTER IMAGES TYPE DS TM </span></p>
<p><span style="font-family: courier new,courier;"> 0 system - - - 0 sys - shared</span></p>
<p><span style="font-family: courier new,courier;"> 1 default 7.3G 71% - 1 img fs shared</span></p>
<p><span style="font-family: courier new,courier;"> 2 files 7.3G 71% - 0 fil fs ssh</span></p>
<p><span style="font-family: courier new,courier;"><strong> 100 cephds 5.5T 59% - 3 img ceph ceph</strong></span></p>
<p><span style="font-size: small; font-family: courier new,courier;"></span>Once you add the you have verified that the ceph datastore is active you can upload images on the sunstone GUI. Be aware that conversion of images to RBD format of ceph may take quite some time.</p>
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<div>I see in your configuration that system datastore is shared!<br /><br /></div>
<div>Thanks again,<br />Mario</div>
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-- <br />
<div dir="ltr">Jaime Melis<br />C12G Labs - Flexible Enterprise Cloud Made Simple<br /><a href="http://www.c12g.com">http://www.c12g.com</a> | <a href="mailto:jmelis@c12g.com">jmelis@c12g.com</a><br />
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