Re: [Openstack] Question about Disk Setup of Nova Compute Node

Wed, 16 Jan 2013 13:03:23 -0800

I always preferred RAID5 over JBOD myself, but you always need to bench first and decide after :)

Razique Mahroua - Nuage & Co
Tel : +33 9 72 37 94 15


Le 16 janv. 2013 à 18:11, Gui Maluf <[email protected]> a écrit :

Hey Sean,
Did you found which is the best set up for your RAID?
I'm facing the same situation here.
 I've 11 dell r710 servers, with 4x3TB disk each, and I'm wondering if worth it using a RAID5 or JBOD for some server that will run a compute-network-volume node.
Did you got any solution?
Thanks in advance


On Sat, Jan 12, 2013 at 7:21 PM, Razique Mahroua <[email protected]> wrote:
Sorry, the first sentence is wrong : 
Hi,
actually, even for a raid 10 you would end up with 3TB usable (more around 2800 GB)
In both cases you end up with 2 TB :)

Regards,
Razique Mahroua - Nuage & Co
Tel : +33 9 72 37 94 15

<NUAGECO-LOGO-Fblan_petit.jpg>

Le 12 janv. 2013 à 22:19, Razique Mahroua <[email protected]> a écrit :

Hi,
actually, even for a raid 10 you would end up with 3TB usable (more around 2800 GB). You could even go for either a RAID6 or RAID10 actually, since you have 4TB you would end up with 2TB in both cases

Performance wise RAID10 is in most cases faster when it comes to reading speed, sometimes slower when it comes to writing speed, it all depends on you controller. You would bench both RAIDs and pick the faster one :)


Razique Mahroua - Nuage & Co
Tel : +33 9 72 37 94 15

<NUAGECO-LOGO-Fblan_petit.jpg>

Le 11 janv. 2013 à 23:23, Sean Bigdatafun <[email protected]> a écrit :

Razique,

Let's think of the following scenario, we use Nova to build an EC2-kind of compute cluster. For EC2, they offer 

M1.Small = 1 vCPU + 1.7GB Mem + 160GB Disk
M1.Medium = 2vCPU + 3.75GB Mem + 410GB Disk
M1.Large = 4vCPU + 7.5GB Mem + 850GB Disk
M1.ExtraLarge = 8.vCPU + 15GB Mem + 1.7TB Dsik
...

This means that they at least have 1.7TB disk space on a physical server (presumably 2 x 1TB disk).  


What RAID option  would we use in designing our cluster? For our Nova compute nodes,

-- Do we have a JBOD configuration of 2 disks?
-- do we have a RAID 0 of 2 disks?
-- or do we use more enterprise like RAID 5?


Thanks and hopefully this starts some discussion in this direction.

Thanks,
Sean

On Fri, Jan 11, 2013 at 12:46 AM, Razique Mahroua <[email protected]> wrote:
Hi Sean, 
I may be wrong, but I think there is not any "best" RAID strategy when it comes to the disk for the nodes or a "normal" one. All RAID type have their pros and cons.
It'a all about security over performance against total space that would end up usable. What RAID controller is that?

Regards,
Razique Mahroua - Nuage & Co
<NUAGECO-LOGO-Fblan_petit.jpg>

Le 11 janv. 2013 à 08:36, Sean Bigdatafun <[email protected]> a écrit :

When I have a set of rack servers that is 1TB * 4 disks in each of it as Nova Compute Node, what is the best RAID (or JBOD) strategy OpenStack community recommend? 

Basically I'd like to know what a normal disk setup a compute node should be using.

Thanks,
Sean
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