[Gluster-users] Gluster = RAID 10 over the network?

[Alexey Zilber]

Hi Ryan,

   I think if you could provide more info on the storage systems it would
help.  Things like total drives per raid set and size of each drive.  This
is a complicated question,  but a simple Googling brings up this
interesting article:
http://wolfcrow.com/blog/which-is-the-best-raid-level-for-video-editing-and-post-production-part-three-number-soup-for-the-soul/

  Imho,  without knowing any of these details,  my personal preference,
unless you're running a database is to do multiple raid-1 sets, stripe them
with lvm and drop xfs on them.

  I would like to add that if your storage provider only offers raid-5 or
raid-10 it might behoove you to look for another storage provider.  :)

-Alex
On Sep 21, 2014 8:24 PM, "Ryan Nix" <ryan.nix at gmail.com> wrote:

> Hi All,
>
> So my boss and I decided to make a good size investment in a Gluster
> cluster.  I'm super excited and I will be taking a Redhat Storage class
> soon.
>
> However, we're debating the hardware configuration we intend to purchase.
> We agree that each brick/node, and we're buying four, each configured as
> RAID 10 will help us sleep at night, but to me, it seems like such an
> unfortunate waste of disk space.  Our graduate and PHD students work with
> lots of video and they filled up our proof-of-concept 4 TB ownCloud/Gluster
> setup in < 2 months.
>
> I stumbled upon Howtoforge's Gluster setup guide from two years ago and
> I'm wondering if this is correct and or still relevant:
>
> http://bit.ly/1qkLoVe
>
> *This tutorial shows how to combine four single storage servers (running
> Ubuntu 12.10) to a distributed replicated storage with GlusterFS
> <http://www.gluster.org/>. Nodes 1 and 2 (replication1) as well as 3 and 4
> (replication2) will mirror each other,
> and replication1 and replication2 will be combined to one larger storage
> server (distribution). Basically, this is RAID10 over network. If you lose
> one server from replication1 and one from replication2, the distributed
> volume continues to work. The client system (Ubuntu 12.10 as well) will be
> able to access the storage as if it was a local filesystem*
>
> The vendor we have chosen, System 76, offers either RAID 5 or RAID 10 in
> each server.  Does anyone have insights or opinions on this?  It would seem
> to be that RAID 5 would be okay and that some kind drive monitoring
> (opinions also welcome, please) would be sufficient with the inherent
> nature of Gluster's Distributed/Replicated setup.  RAID 5 at System 76
> allows us to max out at 42 TB of useable space.  RAID 10 makes it 24 TB
> useable.
>
> I'd love to hear any insights or opinions on this.  To me, RAID 5 with
> Gluster in a distributed replicated setup should be sufficient and help us
> sleep well each night.  :)
>
> Thanks in advance!
>
> Ryan
>
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