[Gluster-users] SSD Cache Without RAID Controller

[Alex Crow]

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..
>
> 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

-- 
This message is intended only for the addressee and may contain 
confidential information. Unless you are that person, you may not 
disclose its contents or use it in any way and are requested to delete 
the message along with any attachments and notify us immediately. 
"Transact" is operated by Integrated Financial Arrangements plc. 29 
Clement's Lane, London EC4N 7AE. Tel: (020) 7608 4900 Fax: (020) 7608 
5300. (Registered office: as above; Registered in England and Wales 
under number: 3727592). Authorised and regulated by the Financial 
Conduct Authority (entered on the Financial Services Register; no. 190856).