On 07/05/2012 02:49 AM, Itamar Heim wrote:
On 07/05/2012 12:20 AM, Robert Middleswarth wrote:
I wrote a basic how to for using glusterfs under oVirt. If you have any
questions or you find mistakes please let me know.
Thanks
Robert
http://www.middleswarth.net/content/installing-ovirt-31-and-glusterfs-using-either-nfs-or-posix-native-file-system
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oVirt 3.1 is currently in beta and compared to 3.0 it adds a several new
features. One of the nice new features is glusterfs support. For it
intended use it works well but I personally think it needs to be
adjusted to for more generic use. The 2 main limits that effect me are.
1) Only oVirt nodes in the same cluster can be used as bricks to create
clusters. So you can't add in storage only nodes in the same oVirt
cluster as nodes. However you can create a cluster of just gluster only
nodes.
the long term plan would be "dynamic clusters/services" - a subset of
hosts with gluster, a subset of hosts with virt, some with both, in
overlapping clusters.
a more simple solution to this would be just allowing to specify at
host level if to use the host for gluster service and/or virt service
(so still same set of hosts in a cluster, just allowing to choose if
they are to be used for the relevant service).
A host level option would fix the issue.
> 2) You can not change what interface / IP gluster uses, it will
always use the ovirtmgmt network. This is a weakness as many people have
an independent network just for storage and they can't use them with
3.1.
sorry, i don't understand this one - only the management of gluster is
done via this interface. you can define a different logical network in
the cluster for storage, configure ip addresses for them, and define
the mount point that way.
(well, apart from potential bugs on network definitions in 3.1 which
may still exist)
Unless I am missing something if I setup Gluster to use anything other
then the ovirtmgmt network then I can't create volumes because the
engine uses the ovirtmgmt networks IP's and Gluster doesn't recognize it.
If you can live with these limits then gluster intergration is for you.
Before we start you should ask yourself whether you want to use
glusterfsover NFS or posix (Native) fs. Both work and are very simlilar
in setup but they do work slightly differently. Many prefer the native
version and if you are using Fedora 17 with it latest kernal then native
(posix) fs actually supports direct IO that will increase the throuput a
lot. However I found on CentOS 6.2 nodes NFS ran faster because NFS
shares are cached. My testing was over a 1G networks so a faster network
will yield different results. Both install methods are pretty much the
same I will add notes on there differences.
cache is supposed to be only relevant to read only images like
templates, and i'm not even sure this optimization is in.
so caching is supposed to be disabled (otherwise, shared disk won't
work, etc.)
maybe something else?
NFS is faster on my network. When I looked around to see why it
suggested that reads were cached. It was real world testing you never know.
A quick word about OS. While there are plans to support EL6 and other
Linux based distributions, support is currently limited to Fedora 17.
However Andrey Gordeev ( http://www.dreyou.org/ovirt/ ) has created EL6
packages. Since Fedora 17 crashes on both my Dells every 10 to 12 hours
I use the centos builds right now. Although the CentOS builds work
really well there are a few missing features, such as live snapshots. I
have done both installs and the steps outlined below work for both.
very nice!
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