--=-aZsrVzyAkVB3GVWiu1xW Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, for some reason the message was flagged spam; so there was a deplay. oVirt supports direct LUNs. These LUNs are often already partitions of some RAID enclosure. AFAIK the MSA60 is a JBOD. You can use the p411 controller to create your partitions / LUNs. The Virtio-SCSI paravirt driver supports a wide range of (=3Dmost) SCSI commands. This way clients can access them as 'real' SCSI devices. If you did partition the LUN with parted, then the client(s) will see these partitions also, along with the file system on it.=20 As you might know, you cannot have 'normal' file systems mounted rw on several machines at one, you need a cluster file system; see examples in [1]; there are several open source FS's around. Also, nothing stops you from mounting a file system read only on several hosts. One note on the subject, though: I consider shared disk file systems as 'old' approach. I support them in our setup because of historical reasons.=20 Today in a new deployment I would tend to use more 'modern' scale out file systems like GlusterFS (support in oVirt is quite well) or Ceph/Rados as object store file system. Using the native clients, you basically have a shared disk file system with less bottlenecks (MDC's in shared disk fs). Also, both examples have APIs - an application using this can greatly benefit in performance. Again, I consider using APIs for file storage the approach of the future. If you need to attach NFS / CIFS clients, you can always reshare these file systems and use (p)NFS or CTDB if you want to cluster this. Note, with one host and one JBOD this makes little sense to me. [1] http://en.wikipedia.org/wiki/Clustered_file_system [2] https://ctdb.samba.org/ On Mo, 2014-07-14 at 08:10 +0000, Niklas Fondberg wrote:
Thanks, after reading it makes sense. I suppose I need to drop my hope of having sharing possibility with the host. I have two questions that you might be able to answer: 1. Does direct LUN support partitions or only whole devices 2. Do you know of any open source way of making them shareable to Ovirt? =20 My setup is simple: - HP DL380 with dual Xeon and lots of RAM. Boots from seperate disk (USB) - MSA60 with p411 attached to the HP DL380 =20 When we grow oVirt we will grow with DL360=C2=B9s and use all shared stor= age from the guest fileserver on the first host. =20 =20 =20 On 14/07/14 08:57, "Daniel Helgenberger" <daniel.helgenberger@m-box.de> wrote: =20
Hello,
just add my 2ct: I did a lot of bench marking for our SAN (FC LUN's). I also need file servers for our SMB Clients.
I recommend using Direct Attached LUNs for your purpose and attach them to the VMs as VirtIO-SCSI disks. You can even added them as shareable to oVirt if you deploy some kind of SAN file system (we use Quantum's StorNext).
Bottom line, the implementation of VirtIO-SCSI is so well done and support in oVirt is great. I cound not see any bottlenecks in the visualization. For the foreseeable future I will not deploy bare metal file Servers again.
HTH,
On So, 2014-07-13 at 15:47 +0000, Niklas Fondberg wrote:
=20 From: Karli Sj=C3=B6berg <Karli.Sjoberg@slu.se<mailto:Karli.Sjoberg@sl= u.se>> Date: Sunday 13 July 2014 14:51 To: Niklas Fondberg <niklas@vireone.com<mailto:niklas@vireone.com>> Cc: "users@ovirt.org<mailto:users@ovirt.org>" <users@ovirt.org<mailto:users@ovirt.org>>, Karli Sj=C3=B6berg <Karli.Sjoberg@slu.se<mailto:Karli.Sjoberg@slu.se>> Subject: Re: [ovirt-users] fileserver as a guest oVirt =20 =20 Den 12 jul 2014 22:49 skrev Niklas Fondberg <niklas@vireone.com<mailto:niklas@vireone.com>>:
On 12 jul 2014, at 16:57, "Karli Sj=C3=B6berg"
<Karli.Sjoberg@slu.se<mailto:Karli.Sjoberg@slu.se>> wrote:
Den 12 jul 2014 15:45 skrev Niklas Fondberg
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
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
<niklas@vireone.com<mailto:niklas@vireone.com>>: path directory with NFS + SMB (which is semi crippled on the host after oVirt installation with version 3 et.c.). 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.
=20 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. =20 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 impor= t to a "real" setup when the AIO starts feeling crowded later on. Thinkin= g ahead is never a bad thing, no? =20 /K =20 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. 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 ca= n figure out how to work with hooks...) Any chance anybody has an answer for these questions? =20 _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
--=20
Daniel Helgenberger m box bewegtbild GmbH
P: +49/30/2408781-22 F: +49/30/2408781-10
ACKERSTR. 19=20 D-10115 BERLIN=20
www.m-box.de www.monkeymen.tv
Gesch=C3=A4ftsf=C3=BChrer: Martin Retschitzegger / Michaela G=C3=B6llner Handeslregister: Amtsgericht Charlottenburg / HRB 112767=20 =20
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