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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I agree ‘unmanage’ should try to ‘undo’ as much as possible.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In this way, ‘manage’ the 2<sup>nd</sup> time will also work with the exact same command arguments as it did the first time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ramy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Deepak Shetty [mailto:dpkshetty@gmail.com]
<br>
<b>Sent:</b> Thursday, April 10, 2014 1:03 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Cinder] Regarding manage_existing and unmanage<o:p></o:p></span></p>
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<p class="MsoNormal">On Wed, Apr 9, 2014 at 9:39 PM, Duncan Thomas <<a href="mailto:duncan.thomas@gmail.com" target="_blank">duncan.thomas@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On 9 April 2014 08:35, Deepak Shetty <<a href="mailto:dpkshetty@gmail.com">dpkshetty@gmail.com</a>> wrote:<br>
<br>
> Alternatively, does this mean we need to make name_id a generic field (not a<br>
> ID) and then use somethign like uuidutils.is_uuid_like() to determine if its<br>
> UUID or non-UUID and then backend will accordinly map it ?<o:p></o:p></p>
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<p class="MsoNormal">Definitely not, overloading fields is horrible. If we are going to do<br>
a mapping, create a new, explicit field for it.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
> Lastly, I said "storage admin will lose track of it" bcos he would have<br>
> named is "my_vol" and when he asks cidner to manage it using "my_cinder_vol"<br>
> its not expected that u wud rename the volume's name on the backend :)<br>
> I mean its good if we could implement manage_existing w/o renaming as then<br>
> it would seem like less disruptive :)<o:p></o:p></p>
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<p class="MsoNormal">I think this leads to a bad kind of thinking. Once you've given a<br>
volume to cinder, the storage admin shouldn't be /trying/ to keep<br>
track of it. It is a cinder volume now, and cinder can and should do<br>
whatever it feels appropriate with that volume (rename it, migrate it<br>
to a new backend, etc etc etc)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Ok, agreed. But then when admin unmanages it, we shud rename it back to the name<br>
that it originally had before it was managed by cinder. Atleast thats what admin can hope<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">to expect, since he is un-doing the managed_existing stuff, he expects his file name to be
<br>
present as it was before he managed it w/ cinder.<o:p></o:p></p>
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<p class="MsoNormal">We can always store the orignal name of the volume in a new field in admin_metadata ?<br>
say managed_name and let cinder do whatever it wants (incl rename) when it manages it<br>
<br>
There are 2 adv to this<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">1) admin can always see the admin_metadata to know which original name maps to cinder
<br>
name. This also helps to figure of all the volumes managed by cinder, which were the ones<br>
that actually got in thru "managed_existing" such that it was _not_ actually created by cinder<br>
in the first place<o:p></o:p></p>
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<p class="MsoNormal">2) During unmanage, use the managed_name to rename the file to if original name.<br>
<br>
thanx,<br>
deepak<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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_______________________________________________<br>
OpenStack-dev mailing list<br>
<a href="mailto:OpenStack-dev@lists.openstack.org">OpenStack-dev@lists.openstack.org</a><br>
<a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><o:p></o:p></p>
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