[Gluster-users] SSD Cache Without RAID Controller

[Ben Turner]

----- Original Message -----
> From: "Alex Crow" <acrow at integrafin.co.uk>
> To: gluster-users at gluster.org
> Sent: Friday, April 24, 2015 4:36:01 AM
> Subject: Re: [Gluster-users] SSD Cache Without RAID Controller
> 
> 
> On 24/04/15 09:14, Punit Dambiwal wrote:
> > Hi,
> >
> > I want to use the glusterfs with the following architecture :-
> >
> > 1. 3* Supermicro servers As storage node.
> > 2. Every server has 10 SATA HDD (JBOD) and 2 SSD for caching (2
> > Additional on back pane for OS).
> > 3. Gluster should be replica=3
> > 4. 10G network Connection....
> >
> > The question is how to configure the SSD caching for 10 Bricks,just
> > like CEPH (write the journal on SSD drives)...I didn't find any
> > article for the same..

You should look at tiering, it is currently in development but will be ready soon-ish:

http://www.gluster.org/community/documentation/index.php/Features/data-classification

The hot tier would be the SSDs and the could tier would be your spinning disks.  It should be available with 3.7, if you are interested it would be awesome to have an early adopter :)

-b

> >
> > Thanks,
> > Punit
> >
> You have at least 2 choices for SSD caching with current GlusterFS.
> 
> 1. Use Centos 7 and use LVM cache on your SSDs.
> 2. Use ZFS as your brick filesystem and set up an SLOG, say 4GB and an
> L2ARC (rest of the space) on the SSDs. Note that the SLOG would need to
> be a mirror if you only have 2 SSDs. L2ARC can be a stripe.
> 
> Native Glusterfs tiering is being developed at the moment.
> 
> Alex
> 
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