[Gluster-users] RAID options for Gluster

[Rodrigo Severo]

On Mon, Jun 18, 2012 at 4:01 AM, Fernando Frediani (Qube) <
fernando.frediani at qubenet.net> wrote:


> Unfortunately Gluster doesn't yet have the ability to be aware of bricks
> on the same node and don't put data there. That would allow create more
> than one set of RAID on the same server and avoid going over 12-16 disks in
> a RAID 5 array.
>

Even though Gluster isn't aware, you are so you can create the volume
taking care that replicated data goes to different servers.  It's all on
the brick order you pass when creating the volume.

I've replcated-distributed volumes with only 2 servers.


Rodrigo


>
> Fernando
>
> -----Original Message-----
> From: gluster-users-bounces at gluster.org [mailto:
> gluster-users-bounces at gluster.org] On Behalf Of Arnold Krille
> Sent: 15 June 2012 23:10
> To: gluster-users at gluster.org
> Subject: Re: [Gluster-users] RAID options for Gluster
>
> Gotta wear my BAARF-hat:
>
> On 15.06.2012 12:14, Fernando Frediani (Qube) wrote:
> > Going to the idea of using RAID controllers would you think that for say
> 16 disks(or 12) Raid 5 would be fine  given the data is already replicated
> somewhere in another node in a very unlikely event you loose a node.
> > Now in a node with more number of disk slots could create multiple Raid
> 5 logical volumes, but will Gluster be smart enough to not put replicated
> data on two logical volumes residing on the same node ?
>
> Using raid5 will just leave you with reading from at least two disks then
> writing to two disks instead of just writing your data to disk.
> Unless write-performance is of no interest to you, you should re-think
> raid5...
>
> If disks are pricey for you, just use all of them and deal with the failed
> bricks. If disks are cheap, just put always two together in a raid1.
>
> Have fun,
>
> Arnold
>
> (*) http://www.miracleas.com/BAARF/
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Rodrigo Severo

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