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HDD provisioning for nova-compute

asked 2013-05-12 16:35:03 -0500

pabelanger gravatar image

Greetings,

Our Dell R515 arrived last week, and we'll be provisioning it as our first nova-compute node. Right now, that's the only openstack software we plan to have on this box. Reading around the web, I cannot seem to find much information about HDD provisioning (EG: raid setup).

At most I've been reading a year old post[1] about an example setup, seems to make sense however I was looking for additional feedback. The server has 6 x 600GB drives, and right now I am leaning toward just lumping them together in a RAID 10 setup.

Thoughts, or suggestions of additional reading material?

[1] http://www.cybera.ca/tech-radar/lets-build-cloud-%E2%80%94-introduction

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answered 2013-05-12 17:54:24 -0500

cfb gravatar image

You disk configuration will depend greatly on how you want to handle your VM root disk. If you plan on having a limited number of nodes and/or are comfortable with your VMs root disks only living on a single system then a RAID 10, RAID5, or RAID6 setup is fine. The exact configuration would be governed by the capabilities of your RAID card and your I/O profile.

In this case the root disk for any VMs started on the R515 will only live on that host and you will need to use a block migration of some type if you want to move that VM to another host (example: nova live-migration --block-migrate <server> <host>).

If on the other hand you want your VM root disks to be able to survive the loss of a single host, or RAID controller, you need to look into some form of external storage (eg. NetApp, EMC, etc) or CEPH (http://ceph.com/) for redundant, distributed local storage.

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Thanks, since you we're the only reply, I accepted the answer. I'm back to working on the server again this week after this many months.

pabelanger gravatar imagepabelanger ( 2013-08-15 21:30:34 -0500 )edit

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Asked: 2013-05-12 16:35:03 -0500

Seen: 185 times

Last updated: May 12 '13