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<p class="MsoNormal"><span style="color:black">Hey,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">We’re looking into implementing the
<a href="https://github.com/openstack/cinder-specs/blob/master/specs/liberty/replication_v2.rst">
VolumeReplication_V2</a> spec for our NetApp E-Series volume driver. Looking at the specification, I can foresee a problem with implementing the new API call “</span><span style="color:#333333;background:white">failover_replicated_volume(volume)<span class="apple-converted-space"> “
with an unmanaged replication target. I believe with a managed target we can provide it, if I’m understanding correctly that it merely requires updating the host id for the volume. Based on that, I have two questions:</span></span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span class="apple-converted-space"><span style="color:#333333;background:white"> </span></span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#333333"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:black">Is it acceptable, in implementing this spec, to only provide this API for managed targets (and either throw an exception or essentially make a no-op) for an unmanaged replication target?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#333333"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:black">In general, if a storage backend is incapable of performing a certain operation, what is the correct way to handle it? Can the driver implement the spec at all? Should it throw a NotImplementedError?
No-op?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Michael Price<o:p></o:p></span></p>
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