<html><head></head><body>Hi steve,<br>
<br>
The blockdevicedriver looks like exactly what i need. I don't know how I missed it. <br>
<br>
Thank you!<br>
David<br><br><div class="gmail_quote">On August 30, 2015 10:53:40 AM EDT, Steve Gordon <sgordon@redhat.com> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail">----- Original Message -----<br /><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> From: "David Arroyo" <droyo@aqwari.net><br /> To: openstack-operators@lists.openstack.org<br /> <br /> Hello,<br /> <br /> I would like to pass entire disks to my openstack instances. I have<br /> some IO-bound workloads and would like to avoid any overhead or<br /> contention by giving an instance access to N additional disks, such<br /> that they do not share that disk with other guests on the same compute<br /> node.<br /> <br /> These additional disks do not need to last longer than the instances<br /> themselves; they are "ephemeral" in that regard. There is no need for<br /> backup, no need for instance or data migration, and no need for running<br /> the instance on a separate compute node from the extra disks.<br /> Effectively I want to have an "extra disks" property, as part of a<br /> flavor or
image, that is handled like vcpus without overcommit.<br /> <br /> I have been doing some research but have not yet found an obvious way<br /> to do this in openstack. Does anyone else have a similar use case, and<br /> how have you handled it? To be more specific, we run some very large<br /> Cassandra clusters on physical hardware, with excellent performance.<br /> Cassandra is largely IO-bound, and we want to virtualize it without<br /> introducing unnecessary IO latency.<br /> <br /> Cheers,<br /> David<br /></blockquote><br />Have you looked at the BlockDeviceDriver as described here:<br /><br /> <a href="http://cloudgeekz.com/71/how-to-setup-openstack-to-use-local-disks-for-instances.html">http://cloudgeekz.com/71/how-to-setup-openstack-to-use-local-disks-for-instances.html</a><br /><br />-Steve<br /></pre></blockquote></div><br>
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