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<div class="moz-cite-prefix">2012-12-20 23:18, Morrissey,
Christopher:<br>
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<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve been working on a bit of functionality
for the engine that will allow a user to query a domain for
new disk images (GetUnregisteredImagesQuery) for which the
engine was previously unaware and a separate command to
register those images (ImportImageCommand). These commands
will be exposed through the REST API.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This functionality is needed as we are
developing an extension/plugin to oVirt that will allow a
NetApp storage controller to handle cloning the actual disks
outside of oVirt and need to import them once they are cloned.
We’ll be using other existing APIs to attach the disk to the
necessary VM once the disk is cloned. On the NetApp side,
we’ll ensure the disk is coalesced before cloning so as to
avoid the issues of registering snapshots.</p>
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I am just curious about how the third party tool like NetApp to
make sure the disk of a running VM coalesced before cloning? By an
agent in the VM to flush file-system cache out to the disk?<br>
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<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">GetUnregisteredImagesQuery will be
accessible through the disks resource collection on a storage
domain. A “disks” resource collection does not yet exist and
will need to be added. To access the unregistered images, a
parameter (maybe “unregistered=true”) would be passed. So the
path to “GET” the unregistered disk images on a domain would
be something like
/api/storagedomains/f0dbcb33-69d3-4899-9352-8e8a02f01bbd/disks?unregistered=true.
This will return a list of disk images that can be each used
as input to the ImportImageCommand to get them added to oVirt.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ImportImageCommand will be accessible
through “POST”ing a disk to /api/disks?import=true. The disk
will be added to the oVirt DB based on the information
supplied and afterward would be available to attach to a VM.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When querying for unregistered disk images,
the GetUnregisteredImagesQuery command will use the
getImagesList() VDSM command. Currently this only reports the
GUIDs of all disk images in a domain. I had been using the
getVolumesList() and getVolumeInfo() VDSM commands to fill in
the information so that valid disk image objects could be
registered in oVirt. It seems these two functions are set to
be removed since they are too invasive into the internal VDSM
workings. The VDSM team will need to either return more
information about each disk as part of the getImagesList()
function or add a new function getImageInfo() that will give
the same information for a given image GUID.</p>
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<br>
Here is the project proposal for floating disk in oVirt. I think
unregistered images are also floating disks.<br>
<a class="moz-txt-link-freetext" href="http://www.ovirt.org/Features/DetailedFloatingDisk">http://www.ovirt.org/Features/DetailedFloatingDisk</a><br>
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<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Note that much of this work had originally
been submitted under patch
<a moz-do-not-send="true"
href="http://gerrit.ovirt.org/#/c/9603/">http://gerrit.ovirt.org/#/c/9603/</a>.
After several reviews it was found to be lacking in its design
and was using deprecated APIs that did not yet have
replacements. I’m reworking the code now to conform to this
design and asking for further input from the VDSM, core, and
restapi teams to ensure we can get this done quickly and
correctly as it is needed for the 3.2 release.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Chris<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Chris Morrissey<o:p></o:p></b></p>
<p class="MsoNormal">Software Engineer<o:p></o:p></p>
<p class="MsoNormal">NetApp Inc.<o:p></o:p></p>
<p class="MsoNormal">919.476.4428<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
<br>
<pre class="moz-signature" cols="72">--
---
舒明 Shu Ming
Open Virtualization Engineerning; CSTL, IBM Corp.
Tel: 86-10-82451626 Tieline: 9051626 E-mail: <a class="moz-txt-link-abbreviated" href="mailto:shuming@cn.ibm.com">shuming@cn.ibm.com</a> or <a class="moz-txt-link-abbreviated" href="mailto:shuming@linux.vnet.ibm.com">shuming@linux.vnet.ibm.com</a>
Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC</pre>
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