[Gluster-users] Gluster infrastructure question

[Ben Turner]

----- Original Message -----
> From: "Ben Turner" <bturner at redhat.com>
> To: "Heiko Krämer" <hkraemer at anynines.de>
> Cc: "gluster-users at gluster.org List" <gluster-users at gluster.org>
> Sent: Monday, December 9, 2013 2:26:45 PM
> Subject: Re: [Gluster-users] Gluster infrastructure question
> 
> ----- Original Message -----
> > From: "Heiko Krämer" <hkraemer at anynines.de>
> > To: "gluster-users at gluster.org List" <gluster-users at gluster.org>
> > Sent: Monday, December 9, 2013 8:18:28 AM
> > Subject: [Gluster-users] Gluster infrastructure question
> > 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > Heyho guys,
> > 
> > I'm running since years glusterfs in a small environment without big
> > problems.
> > 
> > Now I'm going to use glusterFS for a bigger cluster but I've some
> > questions :)
> > 
> > Environment:
> > * 4 Servers
> > * 20 x 2TB HDD, each
> > * Raidcontroller
> > * Raid 10
> > * 4x bricks => Replicated, Distributed volume
> > * Gluster 3.4
> > 
> > 1)
> > I'm asking me, if I can delete the raid10 on each server and create
> > for each HDD a separate brick.
> > In this case have a volume 80 Bricks so 4 Server x 20 HDD's. Is there
> > any experience about the write throughput in a production system with
> > many of bricks like in this case? In addition i'll get double of HDD
> > capacity.
> 
> Have a look at:
> 
> http://rhsummit.files.wordpress.com/2012/03/england-rhs-performance.pdf

That one was from 2012, here is the latest:

http://rhsummit.files.wordpress.com/2013/07/england_th_0450_rhs_perf_practices-4_neependra.pdf

-b
 
> Specifically:
> 
> ● RAID arrays
> ● More RAID LUNs for better concurrency
> ● For RAID6, 256-KB stripe size
> 
> I use a single RAID 6 that is divided into several LUNs for my bricks.  For
> example, on my Dell servers(with PERC6 RAID controllers) each server has 12
> disks that I put into raid 6.  Then I break the RAID 6 into 6 LUNs and
> create a new PV/VG/LV for each brick.  From there I follow the
> recommendations listed in the presentation.
> 
> HTH!
> 
> -b
>  
> > 2)
> > I've heard a talk about glusterFS and out scaling. The main point was
> > if more bricks are in use, the scale out process will take a long
> > time. The problem was/is the Hash-Algo. So I'm asking me how is it if
> > I've one very big brick (Raid10 20TB on each server) or I've much more
> > bricks, what's faster and is there any issues?
> > Is there any experiences ?
> > 
> > 3)
> > Failover of a HDD is for a raid controller with HotSpare HDD not a big
> > deal. Glusterfs will rebuild automatically if a brick fails and there
> > are no data present, this action will perform a lot of network traffic
> > between the mirror bricks but it will handle it equal as the raid
> > controller right ?
> > 
> > 
> > 
> > Thanks and cheers
> > Heiko
> > 
> > 
> > 
> > - --
> > Anynines.com
> > 
> > Avarteq GmbH
> > B.Sc. Informatik
> > Heiko Krämer
> > CIO
> > Twitter: @anynines
> > 
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