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 <[email protected]> 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:[email protected]] > *Sent:* 03 April 2015 13:15 > *To:* Bill Dossett; [email protected] > > *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:* [email protected] [ > mailto:[email protected] > <[email protected]>] *On Behalf Of *Joe Julian > *Sent:* 03 April 2015 12:30 > *To:* [email protected] > *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 > > [email protected] > > 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>* > ] > > > > > > > ------------------------------ > > > > > > > _______________________________________________ > > Gluster-users mailing list > > [email protected] > > http://www.gluster.org/mailman/listinfo/gluster-users > > > > > ------------------------------ > > > > > > ------------------------------ > > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://www.gluster.org/mailman/listinfo/gluster-users >
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