<div style="white-space:pre-wrap">Hi Sean,<br>thanks for the suggestions.</div><br><div class="gmail_quote"><div dir="ltr">On Thu, 8 Dec 2016 at 23:10, Sean McGinnis <<a href="mailto:sean.mcginnis@gmx.com">sean.mcginnis@gmx.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Belmiro,<br class="gmail_msg">
<br class="gmail_msg">
In Cinder there is the "raw disk device" driver that has been used by some<br class="gmail_msg">
for Hadoop and similar applications. That may be something to look at, but<br class="gmail_msg">
with a big warning.<br class="gmail_msg">
<br class="gmail_msg">
That being that it is deprecated in the Ocata release and will be removed<br class="gmail_msg">
in Pike.<br class="gmail_msg">
<br class="gmail_msg">
The reason it is going to be removed has a couple reasons though. One big<br class="gmail_msg">
one is that it is unable to meet the "minimum feature set" that we require<br class="gmail_msg">
for a Cinder driver. There are just too many restrictions on what can be<br class="gmail_msg">
done when you're using raw disk.<br class="gmail_msg">
<br class="gmail_msg">
The other reason was that after running a set of tests, it we really didn't<br class="gmail_msg">
see that much of a difference in uing the raw device driver vs. configuring<br class="gmail_msg">
the LVM driver appropriately. I don't have the full details of those tests<br class="gmail_msg">
handy at the moment, but I'm sure we can track down some specifics if needed.<br class="gmail_msg">
<br class="gmail_msg">
So I would recommend connecting your JBODs to some compute hosts and using<br class="gmail_msg">
that disk space to back LVM, then configure Cinder with the LVM driver to<br class="gmail_msg">
use that pool of space to present volumes to your compute instances.<br class="gmail_msg">
<br class="gmail_msg">
Thanks,<br class="gmail_msg">
Sean<br class="gmail_msg">
<br class="gmail_msg">
On Thu, Dec 08, 2016 at 07:46:35PM +0100, Belmiro Moreira wrote:<br class="gmail_msg">
> Hi,<br class="gmail_msg">
><br class="gmail_msg">
> we have a set of disk servers (JBOD) that we would like to integrate into<br class="gmail_msg">
> our cloud to run applications like Hadoop and Spark.<br class="gmail_msg">
><br class="gmail_msg">
> Using file disks for storage and a huge "/var/lib/nova" is not an option<br class="gmail_msg">
> for these use cases so we would like to expose the local drives directly to<br class="gmail_msg">
> the VMs as ephemeral disks.<br class="gmail_msg">
><br class="gmail_msg">
><br class="gmail_msg">
><br class="gmail_msg">
> Is there already something in Nova that allows this?<br class="gmail_msg">
><br class="gmail_msg">
><br class="gmail_msg">
><br class="gmail_msg">
> thanks,<br class="gmail_msg">
><br class="gmail_msg">
> Belmiro<br class="gmail_msg">
><br class="gmail_msg">
> CERN<br class="gmail_msg">
<br class="gmail_msg">
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