[ovirt-users] Multiple FC SAN's and Hosts LSM etc

[Yaniv Kaul]

On Fri, Jul 15, 2016 at 3:47 PM, Fernando Frediani <
fernando.frediani at upx.com.br> wrote:

> One of the things I don't like very much in oVirt is the LVM on Shared
> Block storage, but unfortunately there are no other options. One day
> perhaps a VMFS5 equivalent will come up somewhere.
>

For some use cases, direct LUN is a great solution.


>
> I would avoid it and put a server in between the SAN and the oVirt Nodes
> and use NFS in order to abstract it, that would give you more flexibility
> and keep you away from LVM. But in your case if you don't have 10GbE
> interfaces you will loose on performance using 1GbE interfaces.
>

Even 10g would be difficult to compete with (what I assume is usually) 2x8G
FC ports, in term of performance. Some kind of bond will be needed to
provide the same level of redundancy - and still the NFS server would be a
single point of failure.


>
> With regards the  migration of VMs between different CPU families I'm not
> sure what is the tolerance of oVirt with it. Depending on the CPUs and the
> cluster types you may be able to do migrations.So I would keep different
> CPU families in different clusters.
>

Note that you can detach and attach complete storage domains (assuming you
moved the LUNs via some other means - like SAN replication), and not
import-export single VMs. This has of course its cons and pros.
Y.


>
> Fernando
>
>
> Em 15/07/2016 07:07, Neil escreveu:
>
> Hi guys,
>
> I'm soon going to have the following equipment and I'd like to find the
> best way to utilise it....
>
> 1.) One NEW FC SAN, and 3 new Dell Hosts with FC cards.
>
> 2.) One OLD FC SAN with 2 older HP hosts with FC cards. (old VMWare
> environment)
>
> 3.) Another OLDER FC SAN with 2 older HP Hosts with FC cards. (old VMWare
> environment)
>
> 4.) I have an existing oVirt 3.5 DR cluster with two hosts and NFS storage
> that is current in use and works well.
>
> Each of the above SAN's will only have FC ports to connect to their
> existing hosts, so all hosts won't be connected to all SAN's. All hosts
> would be the same Centos 7.x release etc.
>
> All existing VM's are going to be moved to the option 1 via a baremetal
> restore from backup onto a NEW oVirt platform. Once installed I'd then like
> to re-commission 2 and 3 above to make use of the old hardware and SAN's as
> secondary or possibly a "new" DR platform to replace or improve on option 4.
>
> Bearing in mind the older hardware will be different CPU generations,
> would it be best to add the older hosts and SAN's as new clusters within
> the same NEW oVirt installation? Or should I rather just keep 2, 3 and 4 as
> separate oVirt installations?
>
> I know in the past live migration wouldn't work with different CPU
> generations, and of course my SAN's won't be physically connected to each
> of the hosts.
>
> In order to move VM's between 1, 2 and 3 would I need to shut the VM down
> and export and import, or is there another way to do this?
>
> Could LSM work between across all three SANS and hosts?
>
> I know I can do a baremetal restore from backup directly onto either 1, 2
> or 3 if needed, but I'd like to try tie all of this into one platform if
> there is good reason to do so. Any thoughts, suggestions or ideas here?
>
> Any guidance is greatly appreciated.
>
> Thank you
>
> Regards.
>
> Neil Wilson.
>
>
>
>
>
>
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