[one-users] Queries regarding Storage Backend for DataStore

[Robert Foote]

Neelesh:



Just a quick FYI – We are also running a Nexenta SAN with our OpenNebula deployment.

At the moment, we are utilizing NFS mounts from the Nexenta SAN for our datastores, over a 10Gb switched storage network.

This has worked well until we got into the ~250 VM mark. Running VM’s are still maintaining great storage performance, and hitting upwards of 8k iops when needed.

 

However, the initial deployments of VMs now, are quite bogged down, and can take upwards of an hour or more to deploy a single VM with a 100Gb drive. We believe this is now due to some NFS bogging. We are currently in the process of moving to iSCSI with our OpenNebula + Nexenta deployments, and are expecting a boost in performance as it relates to the initial deployment of VMs.

 

Robert Foote

Chief Technical Officer

Phone | 1-800-611-8763 Ext. 201

www.bpsnode.com

 

From: Users [mailto:users-bounces at lists.opennebula.org] On Behalf Of Jaime Melis
Sent: Tuesday, January 13, 2015 11:32 AM
To: ngurjar at neeleshgurjar.co.in
Cc: users
Subject: Re: [one-users] Queries regarding Storage Backend for DataStore

 

Hi,

 

- Very first is how actually these datastore works in comparison with Cinder and Glance of OpenStack ?

 

The best thing to do here is to read the documentation and let us know if there's something you don't understand.
http://docs.opennebula.org/4.10/administration/storage/sm.html
 

- Which Datastore I can put on faster connectivity and which on slower?

 

I don't understand the question, the only thing I can say is that the storage subsystem is something OpenNebula relies on. You will get the same performance on your VMs with or without OpenNebula, as it depends on the hypervisor hardware and storage. So when thinking about this, think about it in terms of general performance.

 

- Suppose I launched 2 VMs from one image, where the images are stored of Both VMs?
In OpenStack I need to create Volume and attached as a RootDisk to instance, how should I go ahead in OpenNebula?

 

You register an image, which will be stored in the datastore of choice, and then you create a template that references that image. When you instantiate it, OpenNebula will clone that image, and depending on the datastore driver it will clone it somewhere. Read the guide for each datastore type for more info.
 

- How to calculate required IOPS to decide Storage Backend eg. Number of Drives, RAID level, Connectivity, etc.

 

Best thing to do here is to run some benchmarks, as it largely depends on the whole setup

 

- I was planning to use iSCSI with Nexenta based storage. Is that ok or should I go with Ceph ? will Ceph or NFS give performance ?

 

Yes, Ceph will have better performane than NFS.

- Any suggestions to design the storage backend for DataStore.

 

It depends on each driver
 

- Do I need fiber connectivity between Compute Nodes and Storage ?

 

No, but the better the connectivity is, the less chances you have of having a bottleneck. 


Regards
Neelesh Gurjar
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-- 

Jaime Melis
Project Engineer
OpenNebula - Flexible Enterprise Cloud Made Simple
www.OpenNebula.org <http://www.OpenNebula.org>  | jmelis at opennebula.org <mailto:jmelis at opennebula.org> 

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