[ovirt-users] [Gluster-users] GlusterFS performance with only one drive per host?

[Vlad Kopylov]

The bottleneck is definitely not the disk speed with glusterFS, no
point of using SSD for bricks what so ever

-v

On Thu, Mar 22, 2018 at 6:01 AM, Sahina Bose <sabose at redhat.com> wrote:
>
>
> On Mon, Mar 19, 2018 at 5:57 PM, Jayme <jaymef at gmail.com> wrote:
>>
>> I'm spec'ing a new oVirt build using three Dell R720's w/ 256GB.  I'm
>> considering storage options.  I don't have a requirement for high amounts of
>> storage, I have a little over 1TB to store but want some overhead so I'm
>> thinking 2TB of usable space would be sufficient.
>>
>> I've been doing some research on Micron 1100 2TB ssd's and they seem to
>> offer a lot of value for the money.  I'm considering using smaller cheaper
>> SSDs for boot drives and using one 2TB micron SSD in each host for a
>> glusterFS replica 3 setup (on the fence about using an arbiter, I like the
>> extra redundancy replicate 3 will give me).
>>
>> My question is, would I see a performance hit using only one drive in each
>> host with glusterFS or should I try to add more physical disks.  Such as 6
>> 1TB drives instead of 3 2TB drives?
>
>
> [Adding gluster-users for inputs here]
>
>>
>> Also one other question.  I've read that gluster can only be done in
>> groups of three.  Meaning you need 3, 6, or 9 hosts.  Is this true?  If I
>> had an operational replicate 3 glusterFS setup and wanted to add more
>> capacity I would have to add 3 more hosts, or is it possible for me to add a
>> 4th host in to the mix for extra processing power down the road?
>
>
> In oVirt, we support replica 3 or replica 3 with arbiter (where one of the 3
> bricks is a low storage arbiter brick). To expand storage, you would need to
> add in multiples of 3 bricks. However if you only want to expand compute
> capacity in your HC environment, you can add a 4th node.
>
>>
>> Thanks!
>>
>>
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>
>
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