From fernando.frediani at upx.com Mon Apr 24 14:41:06 2017 Content-Type: multipart/mixed; boundary="===============1280806398998686275==" MIME-Version: 1.0 From: FERNANDO FREDIANI To: users at ovirt.org Subject: Re: [ovirt-users] Hyperconverged Setup and Gluster healing Date: Mon, 24 Apr 2017 11:41:01 -0300 Message-ID: <446d1c35-3981-cdcd-c109-b1a8fa1cb87d@upx.com> In-Reply-To: CANVzE5nokh4MnXYfh8-oSQ8v0o1R4cKP0q1k5SKWPBqBHXiVqg@mail.gmail.com --===============1280806398998686275== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------E1421BB04F7A8066E3169AB1 Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: 7bit Ok, great, thanks for the clarification. Therefore a replica 3 configuration means raw storage space cost is = 'similar' to a RAID 1 and actual data exists only 2 times and two = different servers. Regards Fernando On 24/04/2017 11:35, Denis Chaplygin wrote: > With arbiter volume you still have a replica 3 volume, meaning that = > you have three participants in your quorum. But only two of those = > participants keep the actual data. Third one, the arbiter, stores only = > some metadata, not the files content, so data is not replicated 3 times. > > On Mon, Apr 24, 2017 at 3:33 PM, FERNANDO FREDIANI = > > wrote: > > But then quorum doesn't replicate data 3 times, does it ? > > Fernando > > > On 24/04/2017 10:24, Denis Chaplygin wrote: >> Hello! >> >> On Mon, Apr 24, 2017 at 3:02 PM, FERNANDO FREDIANI >> > w= rote: >> >> Out of curiosity, why do you and people in general use more >> replica 3 than replica 2 ? >> >> >> The answer is simple - quorum. With just two participants you >> don't know what to do, when your peer is unreachable. When you >> have three participants, you are able to establish a majority. In >> that case, when two partiticipants are able to communicate, they >> now, that lesser part of cluster knows, that it should not accept >> any changes. >> >> If I understand correctly this seems overkill and waste of >> storage as 2 copies of data (replica 2) seems pretty >> reasonable similar to RAID 1 and still in the worst case the >> data can be replicated after a fail. I see that replica 3 >> helps more on performance at the cost of space. >> >> >> You are absolutely right. You need two copies of data to provide >> data redundancy and you need three (or more) members in cluster >> to provide distinguishable majority. Therefore we have arbiter >> volumes, thus solving that issue [1]. >> >> [1] >> https://gluster.readthedocs.io/en/latest/Administrator%20Guide/arbit= er-volumes-and-quorum/ >> > > --------------E1421BB04F7A8066E3169AB1 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: 8bit

Ok, great, thanks for the clarification.

Therefore a replica 3 configuration means raw storage space cost is 'similar' to a RAID 1 and actual data exists only 2 times and two different servers.

Regards
Fernando

On 24/04/2017 11:35, Denis Chaplygin wrote:

With arbiter volume you still have a replica 3 volume, meaning that you have three participants in your quorum. But only two of those participants keep the actual data. Third one, the arbiter, stores only some metadata, not the files content, so data is not replicated 3 times.

On Mon, Apr 24, 2017 at 3:33 PM, FERNANDO FREDIANI <fernando.frediani(a)upx.com> wrote:

But then quorum doesn't replicate data 3 times, does it ?

Fernando

On 24/04/2017 10:24, Denis Chaplygin wrote:

Hello!

On Mon, Apr 24, 2017 at 3:02 PM, FERNANDO FREDIANI <= fernando.frediani(a)upx.com= > wrote:

Out of curiosity, why do you and people in general use more replica 3 than replica 2 ?

The answer is simple - quorum. With just two participants you don't know what to do, when your peer is unreachable. When you have three participants, you are able to establish a majority. In that case, when two partiticipants are able to communicate, they now, that lesser part of cluster knows, that it should not accept any changes.

=C2=A0

If I understand correctly this seems overkill and waste of storage as 2 copies of data (replica 2)=C2=A0 seems pret= ty reasonable similar to RAID 1 and still in the worst case the data can be replicated after a fail. I see that replica 3 helps more on performance at the cost of space.

You are absolutely right. You need two copies of data to provide data redundancy and you need three (or more) members in cluster to provide distinguishable majority. Therefore we have arbiter volumes, thus solving that issue [1].

[1] https://gluster.readthedocs.io/en/latest/Administrator%20Guide/arbiter-volumes-and-quorum/<= /a>

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