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<font face="Dialog" size="2">Dear Ruben, </font> </p>
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<font face="Dialog" size="2">You mean:</font> </p>
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<font face="Dialog" size="2">- /var/lib/one is mounted from NAS server just for Front-end</font> </p>
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<font face="Dialog" size="2">- The datastore is mounted from Ceph for frond-end and node</font> </p>
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<font face="Dialog" size="2">So </font> </p>
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<font face="Dialog" size="2">Front-end servers must be mounted NAS (/var/lib/one) and Ceph (/var/lib/one/datastores/[number]), 2 mounted points.</font> </p>
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<font face="Dialog" size="2">Node servers must be mounted only Ceph (/var/lib/one/datastores/[number]), 1 mounted point</font> </p>
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<font face="Dialog" size="2">and the passwordless file must be updated manually</font> </p>
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<font face="Dialog" size="2">Is it correct? </font> </p>
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<font face="Dialog" size="2">so why don't we use ceph for both of shared location? or just /var/lib/one? I really don't want to manage more device. </font> </p>
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<font face="Dialog" size="2">Could you show me the best solution? I'm confused to continue because of stuck in integrate Ceph and opennebula</font> </p>
<br> <br>
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<font face="Dialog" size="2">Regards, </font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">Ndhuynh</font> </p>
<br> <br>
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<font face="Dialog" size="2">----------------------------------------------------------------------</font> </p>
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<font face="Dialog" size="2">Message: 1</font> </p>
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<font face="Dialog" size="2">Date: Tue, 11 Nov 2014 14:30:01 +0000</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">From: "Ruben S. Montero" <rsmontero@opennebula.org></font> </p>
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<font face="Dialog" size="2">To: Huynh Dac Nguyen <ndhuynh@spsvietnam.vn>,</font> </p>
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<font face="Dialog" size="2">users@lists.opennebula.org</font> </p>
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<font face="Dialog" size="2">Subject: Re: [one-users] Do we need to mount /var/lib/one with ceph</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">Message-ID:</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2"><CAGi56tetpMozcEk+dDzLULj7y_YC-PY40av0rbGoPUDB7mcUCg@mail.gmail.com></font> </p>
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<font face="Dialog" size="2">Content-Type: text/plain; charset="utf-8"</font> </p>
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<font face="Dialog" size="2">The system datastore is accessed from the front-end to generate the context</font> </p>
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<font face="Dialog" size="2">iso. Note that you don't need to be it exported from the front-end, the</font> </p>
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<font face="Dialog" size="2">nodes and the front-end itself can mount it from an different NAS server.</font> </p>
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<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">The /var/lib/one contents are needed in the front-end but not by the nodes.</font> </p>
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<font face="Dialog" size="2">Just the system datastore directory.</font> </p>
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<font face="Dialog" size="2">If the VM tries to access a disk from a device that is not mounted or the</font> </p>
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<font face="Dialog" size="2">NAS server is down you'll be in trouble. However, note that context ISO is</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">only accessed during the boot state and the main disks of the VM are in the</font> </p>
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<font face="Dialog" size="2">ceph pool, so you'll probably be fine (but if not tested it)</font> </p>
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<font face="Dialog" size="2">Cheers</font> </p>
<br> <br>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">On Mon Nov 10 2014 at 3:38:14 AM Huynh Dac Nguyen <ndhuynh@spsvietnam.vn></font> </p>
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<font face="Dialog" size="2">wrote:</font> </p>
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<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Dear Ruben,</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
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<font face="Dialog" size="2">> Thank you for replying</font> </p>
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<font face="Dialog" size="2">></font> </p>
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<font face="Dialog" size="2">> So what happens if the front-end opennebula is down</font> </p>
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<font face="Dialog" size="2">> the /var/lib/one isn't mounted,only System Datastore is mounted,</font> </p>
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<font face="Dialog" size="2">> then the VM can't work, right? (the vm requires image and additional</font> </p>
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<font face="Dialog" size="2">> files)</font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Can you explain why we don't need to export the whole /var/lib/one ?</font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Regards,</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Ndhuynh</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> >>> "Ruben S. Montero" <rsmontero@opennebula.org> 11/7/2014 4:52 PM</font> </p>
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<font face="Dialog" size="2">> >>></font> </p>
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<font face="Dialog" size="2">> Hi Ndhuynh</font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Ceph storage in OpenNebula is handled as follows:</font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> 1.- Image Datastores, hold disk images repository as well as images for</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> running VMs in a Ceph volume</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> 2.- System Datastore holds additional VM files, checkpoints, context</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> disks and the like.</font> </p>
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<font face="Dialog" size="2">></font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> If you need live-migration the easiest way is to have a shared</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> filesystem for the System Datastore. You don't need to export the whole</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> /var/lib/one, just the datastore directory, though.</font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> If you do not need to live-migrate VMs you should be ok with a ssh</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> based system datastore....</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Cheers</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
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<font face="Dialog" size="2">></font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> On Wed Nov 05 2014 at 12:09:47 PM Huynh Dac Nguyen</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> <ndhuynh@spsvietnam.vn> wrote:</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Hi All,</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> I'm researching opennebula with ceph, i saw that most of guide focus on</font> </p>
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<font face="Dialog" size="2">> using ceph as datastore - block device, right?</font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Do we need to mount ceph to /var/lib/one as file system to prevent the</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> opennebula frontend down expectedly?</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> My script is:</font> </p>
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<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> 1) Make a ceph file system : one and mount to /var/lib/one in all</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> opennebula node (front-end and node)</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> 2) Create a ceph block device and add to opennebula as datastore</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Is this a right way?</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Regards,</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> Ndhuynh</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">> ndhuynh@spsvietnam.vn</font> </p>
<p style="margin-top: 0; margin-bottom: 0">
<font face="Dialog" size="2">></font> </p>
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