[ovirt-users] fileserver as a guest oVirt

[Karli Sjöberg]

Den 13 jul 2014 17:47 skrev Niklas Fondberg <niklas at vireone.com>:
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> From: Karli Sjöberg <Karli.Sjoberg at slu.se>
> Date: Sunday 13 July 2014 14:51
> To: Niklas Fondberg <niklas at vireone.com>
> Cc: "users at ovirt.org" <users at ovirt.org>, Karli Sjöberg <Karli.Sjoberg at slu.se>
> Subject: Re: [ovirt-users] fileserver as a guest oVirt
>
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>> Den 12 jul 2014 22:49 skrev Niklas Fondberg <niklas at vireone.com>:
>> >
>> >
>> >
>> > On 12 jul 2014, at 16:57, "Karli Sjöberg" <Karli.Sjoberg at slu.se> wrote:
>> >
>> >>
>> >> Den 12 jul 2014 15:45 skrev Niklas Fondberg <niklas at vireone.com>:
>> >> >
>> >> > Hi,
>> >> >
>> >> > I’m new to oVirt but I must say I am impressed!
>> >> > I am running it on a HP DL380 with an external SAS chassi.
>> >> > Linux dist is Centos 6.5 and oVirt is 3.4 running all-in-one (for now until we need to have a second host).
>> >> >
>> >> > Our company (www.vireone.com) deals with system architecture for many telco and media operators and is now setting up a small own datacenter for our internal tests as well as our IT infrastructure.
>> >> > We are in the process of installing Zentyal for the SMB purposes on a guest and it would be great to have that guest also serving a fs path directory with NFS + SMB (which is semi crippled on the host after oVirt installation with version 3 et.c.).
>> >> >
>> >> > Does anyone have an idea of how I can through oVirt (seen several solutions using virsh and kvm) letting my Zentyal Ubuntu guest have access to a host mount point or if necessary (second best) a seperate partition?
>> >> >
>> >> > Best regards
>> >> > Niklas
>> >> >
>> >>
>> >> Why not just give the guest a thin provision virtual hard drive and expand it on a demand basis?
>> >>
>> >> /K
>> >
>> > Thanks for the advise but this would not suite us I'm afraid. It would be difficult wrt incremental backups as well as host machine file-routines.
>> >
>> >
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>> Well, going by Occam's raizor; the simplest answer is usually correct. Can't really tell what you mean by file-routines but backups would be well served by snapshots (can't get more incremental than that) and disaster recovery could be as easy as a rsync from inside the guest to a remote machine.
>>
>> The biggest pros here is the ease of being able to setup an export domain, attach, export the VM, detach domain, and then attach and import to a "real" setup when the AIO starts feeling crowded later on. Thinking ahead is never a bad thing, no?
>>
>> /K
>
> Thanks for your suggestions!
> The thing also is that the performance will be very bad if we have the 25TB SAS array shared for our purposes (lots of media streaming) using a virtual disk.

Not that I'm trying to force my view of the world on you, but I get the feeling that you haven't really done any benchmarking to be able to come to any such conslusions. My advice would be to install "bonnie++" in both Host and Guest and compare results. You'll perhaps be surprised just how good a virtual hard drive can be. And remember, it only needs to be able to handle what's coming over the network, so the network is the bottleneck here, not the disks.

/K

> What I am after (after more reading) is support for virtio-9p-pci (http://www.linux-kvm.org/page/9p_virtio) using oVirt. Alternative is the Direct LUN hook (http://www.ovirt.org/VDSM-Hooks/directlun, if I can figure out how to work with hooks…)
> Any chance anybody has an answer for these questions?
>
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