If you really need that much speed you need to go for 10GBit links

There are some switches e.g .the ones compatible with Open Network Lin= =3D ux that are relativley cheap when it comes to 10Gbit ( http://opennetlinux.org/hcl )

Cheers

Soeren

From: =3DDE=3DF0=3DE8=3DE9 =3DCF= =3DEE=3DEB=3DF2=3DEE=3D =3DF0=3DE0=3DF6=3DEA=3DE8=3DE9 <y.poltor=3D atskiy(a)gmail.com>
Date: Monday 1 June 2015 08:56
To: Soeren Malchow <soeren.malchow(a)mcon.net>
Cc: "users(a)ovirt.org" <=3D users(a)ovirt.org>
Subject: Re: [ovirt-users] gluste= r =3D config in 4 node cluster

2015-06-01 2:32 GMT+03:00 Soeren Malchow <= sp=3D an dir=3D3D"ltr"> <soer= en.mal=3D chow(a)mcon.net>:

Hi

For a production environment i would not build a 2 node gluster, i wou= =3D ld build at least 3 nodes to have it much easier with the quorum.

Taking into account that you can use commodity hardware i would also s= =3D uggest to split the services, but i would go for at least 3 gluster nodes = =3D =3D96 which add up to at least 5 nodes for a HA system.

If you want 4 in any case, then my suggestion would be to go for 4 rep= =3D licas, each node has anything that it needs to run and you can basically us= =3D e NFS to localhost for the storage which would make the nodes always access= =3D the local storage for the VMS, availability wise it makes no difference.

I have data center with one cluster based on 3 nodes with both service= =3D s: virt and gluster, and GlusterFS as a data domain. Every node has a singl= =3D e HDD as a brick (replica 3) and 2x1G nics with bonding on top (src-dst-ip)= =3D . I have 2 vlans: 1 - management, 2 - VMs.

If in a VM I run something like 'dd if=3D3D/dev/zero of=3D3D/tmp/tmp' = I ha=3D ve around 80+ MB/s write speed, at this moment on SPM node i run 'iftop= =3D -i bond0.1' and can see two flows with around 900 Mb/s each of them to the= =3D second and to the third nodes (thanks to the bonding that every flow can be done through separate nic). All of this= =3D is expected result and in this case we reach a lim= it of bandwidth our nics. And even if HDD of a node has 150+ MB= =3D /s linear write speed I can not reach such speed of write in VMs.

What result would I get with 4 nodes and gluster replica 4? I expect t= =3D hat write speed in VM will be much slower, because now SPM node will genera= =3D te three flows, and two of them will go through one nic and we will have on= =3D ly 500Mb/s per flow and in this way the write speed of VM will be twice lower.

Am I wrong?

Cheers

Soeren

From: =3DDE=3DF0=3DE8=3DE9 =3DCF= =3DEE=3DEB=3DF2=3DEE=3D =3DF0=3DE0=3DF6=3DEA=3DE8=3DE9 <y.poltoratskiy(a)gmail.com>
Date: Sunday 31 May 2015 18:32
To: "users(a)ovirt.org" <users(a)ovirt.org>
Subject: Re: [ovirt-users] gluste= r =3D config in 4 node cluster

Hi,

As for me, I would build one cluster with gluster service only based on two= =3D nodes (replica 2), and the other one with virt service only based on other= =3D two nodes. I think this variant is more scalable in future.

PS. I am a new in oVirt, so do not except that I am wrong.

28.05.2015 23:11, p=3D af1(a)email.cz =3DEF=3DE8=3DF8=3DE5=3DF2:

Hello,
How to optimal configure 4 node cluster for any one node goes to = =3D ; maintenance without stopping VM ??

a) replica 4 - but it takes a lot of space
b) disperse 3+1 ( raid 5 ) - but bad performance and not visible by oVi= =3D rt 3.7.2
c) stripe2+replica2 =3D3D but VM paused

any other idea ?
regs.
Pa.

_______________________________________________ Users mailing list Users(a)ovirt.or= g ht=3D tp://lists.ovirt.org/mailman/listinfo/users

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