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<p>Thank you very much.</p>
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<div class="ecxmoz-signature">-- <br>
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<font color="#3366ff"><font color="#000000">Respectfully<b><br>
</b><b>Mahdi A. Mahdi</b></font></font><font color="#3366ff"><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Karthik Subrahmanya <ksubrahm@redhat.com><br>
<b>Sent:</b> Wednesday, April 19, 2017 4:30:30 PM<br>
<b>To:</b> Mahdi Adnan<br>
<b>Cc:</b> gluster-users@gluster.org<br>
<b>Subject:</b> Re: [Gluster-users] Replica 2 Quorum and arbiter</font>
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<div>Hi,<br>
</div>
Comments inline.<br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Apr 18, 2017 at 1:11 AM, Mahdi Adnan <span dir="ltr">
<<a href="mailto:mahdi.adnan@outlook.com" target="_blank">mahdi.adnan@outlook.com</a>></span> wrote:<br>
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<p>Hi,</p>
<p><br>
</p>
<p>We have a replica 2 volume and we have issue with setting proper quorum.</p>
<p>The volumes used as datastore for vmware/ovirt, the current settings for the quorum are:</p>
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<div>cluster.quorum-type: auto</div>
<div>cluster.server-quorum-type: server</div>
<span>cluster.server-quorum-ratio: 51%</span><br>
<p></p>
<p><br>
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<p>Losing the first node which hosting the first bricks will take the storage domain in ovirt offline but in the FUSE mount point works fine "read/write"</p>
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<div>This is not possible. When the client quorum is set to auto and the replica count is 2, the first node should be up for read/write to happen from mount. May be you are missing something here.
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<p>Losing the second node or any other node that hosts only the second bricks of the replication will not affect ovirt storage domain i.e 2nd or 4th ndoes.</p>
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<div>Since the server-quorum-ratio is set to 51%, this is also not possible.<br>
Can you share the volume info here?<br>
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<p><span style="font-size:12pt">As i understand, losing the first brick in replica 2 volumes will render the volume to read only</span></p>
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<div>Yes you are correct, loosing the first brick will make the volume read-only.
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<p><span style="font-size:12pt">, but how FUSE mount works in read write ?</span><br>
</p>
<div id="m_5420175686461886192Signature">Also, can we add an <span>arbiter</span> node to the current replica 2 volume without losing data ? if yes, does the re-balance bug "<span>Bug 1440635" affect this process ?</span></div>
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<div>Yes you can add an arbiter brick without losing data and the bug 1440635 will not affect that, since only the metadata need to be replicated on the arbiter brick.
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<div id="m_5420175686461886192Signature">And what happen if we set "<span>cluster.quorum-type: none" and the first node goes offline ? </span></div>
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<div>If you set the quorum-type to auto in a replica 2 volume, you will be able to read/write even when only one brick is up.<br>
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<div>For an arbiter volume, quorum-type is auto by default and it is the recommended setting.<br>
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<div>HTH,<br>
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<div>Karthik <br>
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<div id="m_5420175686461886192Signature"><span></span>Thank you. </div>
<span class="HOEnZb"><font color="#888888">
<div id="m_5420175686461886192Signature"><br>
<div class="m_5420175686461886192ecxmoz-signature">-- <br>
<br>
<font color="#3366ff"><font color="#000000">Respectfully<b><br>
</b><b>Mahdi A. Mahdi</b></font></font><font color="#3366ff"><br>
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</font><font color="#3366ff"></font></div>
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