Hi Greg,<div>Well you could simply don't use openstack-volume. We have a high-available gluster volume which we mount on every compute node under NOVA-INST-DIR/instances/, that's it.</div><div>You can then give a instance more local storage (configured via the flavors) and this additional disk file is stored within the instance (and therefore on gluster too).<br>
<div><br></div><div>Cheers,</div><div>Christian</div><div><br><div class="gmail_quote">2012/3/21 Greg Cockburn <span dir="ltr"><<a href="mailto:gergnz@gmail.com">gergnz@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>Hi all,</div><div><br></div><div>I am looking at building an OpenStack cluster for internal use at my company.</div><div><br></div><div>My previous experience has been solely on virtual clusters using either in house scripts and management tools, or 3rd party commercial offerings (e.g. OracleVM).</div>
<div><br></div><div>I am trying to understand how the underlying block device layer works, and am struggling to understand the documentation.</div><div><br></div><div>We have this NOVA-INST-DIR/instances/ where we have a _base and a delta file created, and this should be mounted on all compute nodes using some cluster FS, NFS or similar.</div>
<div><br></div><div>Then we have openstack-volume, controller-node, LVM and iSCSI in the mix.</div><div><br></div><div>I understand where openstack is coming from trying to build an environment from commodity parts, but the block devices are at the core of the stack, a vital part and require fast, low latency storage.</div>
<div><br></div><div>Using 1Gb iSCSI to a single host seems crazy to me (single point of failure, slow, high-latency).</div><div><br></div><div>I really want to understand how to integrate a FC SAN that utilises Multipathing into the environment and utilise something like CLVM or cluster File-system (e.g. OCFS2) to manage the block devices on each compute node.</div>
<div><br></div><div>Any information on how I might be able to achieve this would be great.</div><div><br></div><div>Thanks,</div><div>Greg.</div>
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