[Gluster-users] newbie quick question

Sun Apr 5 16:13:45 UTC 2015

Hi Bill,

Raid will provide you disk fault tolerance. Replication on GFS will provide
you node fault tolerance.
It's just a matter of design. Using higher levels of Raid (Ex. 5&6) with
replication will provide you high availablitiy with minimal disk capacity
loss.

About using a partition on the same disk array;

Yes, you can.

I'm doin it. I use raid 5 with 4X300GB SAS array. 20 GB, which I allocated
to OS and the rest is working as a bridge.

Regards
Aytac

On Fri, Apr 3, 2015 at 11:21 PM, Bill Dossett <bill.dossett at pb.com> wrote:

>  Thanks Joe,  I think that gives me enough to start with now.  I think
> I’ll do 3 x RAID 0 on each server for 3 bricks on each server to start with
> and see how I get on with that then.
>
>
>
> I appreciate the advice, have a good weekend.
>
>
>
> Bill
>
>
>
>
>
> *From:* Joe Julian [mailto:joe at julianfamily.org]
> *Sent:* 03 April 2015 13:15
> *To:* Bill Dossett; gluster-users at gluster.org
>
> *Subject:* Re: [Gluster-users] newbie quick question
>
>
>
>
>
> On 04/03/2015 11:45 AM, Bill Dossett wrote:
>
> Thanks for your response.  My actual need here is to familiarize myself
> with Gluster…
>
>
>
> This is really a lab project for me to try and get as much experience with
> GlusterFS as I can to see what use it might be.
>
>
>
> I’ve done some thinking and I am going to use the two hosts with 146GB
> disks in for my oVirt cluster now.
>
>
>
> So I am using the 2 x Dell 2950s with 6 x 300GB disks in each for my
> Gluster.
>
>
>
> So my needs now would be that I want as much storage – but able to lose a
> disk and not lose data, so not RAID 0.
>
>
>
> So could you tell me if there are advantages or disadvantages to creating
> a RAID5 out of the 6 x 300 GB disks on each 2950 server and then allocate
> whatever is left after loading the operating system and Gluster as a
> brick?  Or not create RAID and use each disk as brick.  I expect creating
> the RAID as the Dell Perc controller is pretty efficient would be better
> than software defined RAID – for performance anyway?
>
>
>
>
> Replication adds fault tolerance, so with replication, raid is often
> overkill. Use the standard reliability calculations
> <http://www.eventhelix.com/realtimemantra/faulthandling/system_reliability_availability.htm>
> to determine if replication alone will meet your SLA/OLA requirements
> (when/if you have some). The nice thing about replication vs raid is that
> with replication you can lose virtually (or literally if designed that way)
> any piece of hardware and still have access to your data.
>
> You may wish to do some raid 0 or raid 1+0 to get enough disk throughput
> to keep up with your network, depending on each, of course.
>
> Personally, I never do raid 5. The reliability cost vs the cost of storage
> is just too high for my tastes even if the performance hit wasn't important
> to my use case.
>
>
>  Thanks again, I really appreciate the advice.
>
>
>
> Bill
>
>
>
>
>
>
>
> *From:* gluster-users-bounces at gluster.org [
> mailto:gluster-users-bounces at gluster.org
> <gluster-users-bounces at gluster.org>] *On Behalf Of *Joe Julian
> *Sent:* 03 April 2015 12:30
> *To:* gluster-users at gluster.org
> *Subject:* Re: [Gluster-users] newbie quick question
>
>
>
> imho, start by defining your needs then design the system to meet them.
> The only goal set out below is that you, "want to get as much storage out
> of these as possible." This would mean raid0 or 1 brick per disk with a
> distribute array (no replication).
>
> Identically sized bricks are best. Often if the disk sizes are mixed, raid
> or partitioning are used to create bricks of the same size.
>
> On 04/03/2015 09:36 AM, Bill Dossett wrote:
>
> Hi, this is my first attempt at Gluster storage.
>
>
>
> Just a quick help me get started question – the bare metal page yields a
> “not found” on the web site so…
>
>
>
> I have two dell 2950s fully populated with 5 x 300GB 10K disks.
>
>
>
> I want to get as much storage out of these as possible.
>
>
>
> I have two more dell 2950s each with 4 x 146GB 10K disks.
>
>
>
> Should I build one RAID 5 container on the first two servers, load up
> CentOS7 and then Gluster on that?  using the unused partition of what is
> left after loading CentOS?
>
>
>
> Or should I be looking at moving physical disks around and putting the
> smaller 146 GB disks as RAID 1 in each of the 4 servers for OS and
> distributing the 300GB disks amoung all the servers and maybe pick some
> more up on Ebay to get all 4 servers identical?
>
>
>
> Would appreciate any advice on short notice as I have nothing else to do
> today for once and would just as soon at least start off on the right foot!
>
>
>
> *Bill Dossett*
>
> Systems Architect
>
> *Tech Central – Global Engineering Services*
>
>
>
> *T* +1 303 440 3523
>
> *M* +44 (0)777 590 8612
>
> bill.dossett at pb.com
>
> pitneybowes.com
>
>
> *Pitney Bowes*
>
> 4750 Walnut Street | Boulder, Colorado, 80301 | USA
>
>
>
>
>
> In Engineering?
>
> *Raise a ticket via Remedy Anywhere [**HERE**]* *takes less than a minute*
>
>
>
> *CloudForms User Guide available* [*HERE
> <https://dl.dropboxusercontent.com/u/6219441/ManageIQ%20-%20User%20Manual%20PB%20v5.pdf>*
> ]
>
>
>
>
>
>
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