- Users - oVirt List Archives

Re: [Users] Users Digest, Vol 26, Issue 72
by Ryan Barry 17 Nov '13

17 Nov '13

Without knowing how the disks are split among the controllers, I don't want to make any assumptions about how shared it actually is, since it may be half and half with no multipathing. While a multi-controller DAS array *may* be shared storage, it may not be. Moreover, I have no idea whether VDSM looks at by-path, by-bus, dm-*, or otherwise, and there are no guarantees that a SAS disk will present like a FC LUN (by-path/pci...-fc-$wwn...), whereas OCFS POSIXFS is assured to work, albeit with a more complex setup and another intermediary layer. On Nov 17, 2013 10:00 AM, <users-request(a)ovirt.org> wrote: > Send Users mailing list submissions to > users(a)ovirt.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.ovirt.org/mailman/listinfo/users > or, via email, send a message with subject or body 'help' to > users-request(a)ovirt.org > > You can reach the person managing the list at > users-owner(a)ovirt.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Users digest..." > > > Today's Topics: > > 1. Re: oVirt and SAS shared storage?? (Jeff Bailey) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 16 Nov 2013 21:39:35 -0500 > From: Jeff Bailey <bailey(a)cs.kent.edu> > To: users(a)ovirt.org > Subject: Re: [Users] oVirt and SAS shared storage?? > Message-ID: <52882C67.9000707(a)cs.kent.edu> > Content-Type: text/plain; charset=ISO-8859-1 > > > On 11/16/2013 9:22 AM, Ryan Barry wrote: > > > > unfortunally, I didn't got a reply for my question. So.. let's try > > again. > > > > Does oVirt supports SAS shared storages (p. e. MSA2000sa) as > > storage domain? > > If yes.. what kind of storage domain I've to choose at setup time? > > > > SAS is a bus which implements the SCSI protocol in a point-to-point > > fashion. The array you have is the effective equivalent of attaching > > additional hard drives directly to your computer. > > > > It is not necessarily faster than iSCSI or Fiber Channel; almost any > > nearline storage these days will be SAS, almost all the SANs in > > production, and most of the tiered storage as well (because SAS > > supports SATA drives). I'm not even sure if NetApp uses FC-AL drives > > in their arrays anymore. I think they're all SAS, but don't quote me > > on that. > > > > What differentiates a SAN (iSCSI or Fiber Channel) from a NAS is that > > a SAN presents raw devices over a fabric or switched medium rather > > than point-to-point (point-to-point Fiber Channel still happens, but > > it's easier to assume that it doesn't for the sake of argument). A NAS > > presents network file systems (CIFS, GlusterFS, Lustre, NFS, Ceph, > > whatever), though this also gets complicated when you start talking > > about distributed clustered network file systems. > > > > Anyway, what you have is neither of these. It's directly-attached > > storage. It may work, but it's an unsupported configuration, and is > > only shared storage in the sense that it has multiple controllers. If > > I were going to configure it for oVirt, I would: > > > > It's shared storage in every sense of the word. I would simply use an > FC domain and choose the LUNs as usual. > > > Attach it to a 3rd server and export iSCSI LUNs from it > > Attach it to a 3rd server and export NFS from it > > Attach it to multiple CentOS/Fedora servers, configure clustering (so > > you get fencing, a DLM, and the other requisites of a clustered > > filesystem), and use raw cLVM block devices or GFS2/OCFS filesystems > > as POSIXFS storage for oVirt. > > > > These would be terrible choices for both performance and reliability. > It's exactly the same as fronting an FC LUN would be with all of that > crud when you could simply access the LUN directly. If the array port > count is a problem then just toss an SAS switch in between and you have > an all SAS equivalent of a Fibre Channel SAN. This is exactly what we > do in production vSphere environments and there are no technical reasons > it shouldn't work fine with oVirt. > > > Thank you for your help > > > > Hans-Joachim > > > > > > Hans > > > > -- > > while (!asleep) { sheep++; } > > > > > > _______________________________________________ > > Users mailing list > > Users(a)ovirt.org > > http://lists.ovirt.org/mailman/listinfo/users > > > > ------------------------------ > > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > > End of Users Digest, Vol 26, Issue 72 > ************************************* >

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Re: [Users] oVirt and SAS shared storage??
by Ryan Barry 17 Nov '13

17 Nov '13

> > unfortunally, I didn't got a reply for my question. So.. let's try again. > > Does oVirt supports SAS shared storages (p. e. MSA2000sa) as storage > domain? > If yes.. what kind of storage domain I've to choose at setup time? > > SAS is a bus which implements the SCSI protocol in a point-to-point fashion. The array you have is the effective equivalent of attaching additional hard drives directly to your computer. It is not necessarily faster than iSCSI or Fiber Channel; almost any nearline storage these days will be SAS, almost all the SANs in production, and most of the tiered storage as well (because SAS supports SATA drives). I'm not even sure if NetApp uses FC-AL drives in their arrays anymore. I think they're all SAS, but don't quote me on that. What differentiates a SAN (iSCSI or Fiber Channel) from a NAS is that a SAN presents raw devices over a fabric or switched medium rather than point-to-point (point-to-point Fiber Channel still happens, but it's easier to assume that it doesn't for the sake of argument). A NAS presents network file systems (CIFS, GlusterFS, Lustre, NFS, Ceph, whatever), though this also gets complicated when you start talking about distributed clustered network file systems. Anyway, what you have is neither of these. It's directly-attached storage. It may work, but it's an unsupported configuration, and is only shared storage in the sense that it has multiple controllers. If I were going to configure it for oVirt, I would: Attach it to a 3rd server and export iSCSI LUNs from it Attach it to a 3rd server and export NFS from it Attach it to multiple CentOS/Fedora servers, configure clustering (so you get fencing, a DLM, and the other requisites of a clustered filesystem), and use raw cLVM block devices or GFS2/OCFS filesystems as POSIXFS storage for oVirt. Thank you for your help > > Hans-Joachim > Hans -- while (!asleep) { sheep++; }

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[Users] oVirt and SAS shared storage??
by Hans-Joachim 16 Nov '13

16 Nov '13

--========GMXBoundary25901384583304721109 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Hello, unfortunally, I didn't got a reply for my question. So.. let's try again. Does oVirt supports SAS shared storages (p. e. MSA2000sa) as storage domain? If yes.. what kind of storage domain I've to choose at setup time? Thank you for your help Hans-Joachim --========GMXBoundary25901384583304721109 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable <span style=3D'font-family:Verdana'><span style=3D'font-size:12px'>Hello,<b= r /><br />unfortunally, I didn't got a reply for my question. So.. let's tr= y again.<br /><br />Does oVirt supports SAS shared storages (p. e. MSA2000s= a) as storage domain?<br />If yes.. what kind of storage domain I've to cho= ose at setup time?<br /><br />Thank you for your help<br /><br />Hans-Joach= im<br />=C2=A0</span></span> --========GMXBoundary25901384583304721109--

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[Users] Low quality of el6 vdsm rpms
by Patrick Hurrelmann 16 Nov '13

16 Nov '13

Hi all, sorry for this rant, but... I now tried several times to test the beta 3.3.1 rpms, but they can't even be installed in the most times. One time it required a future selinux-policy, although the needed selinux fix was delivered in a much lower version. Now the rpms have broken requirements. It requires "hostname" instead of "/bin/hostname". This broken requirement is not included in the vdsm 3.3 branch, so I wonder where it comes from? Anyway. So I proceeded and tried to build vdsm myself once again. Currently the build fails with (but worked fine some days ago): /usr/bin/pep8 --exclude="config.py,constants.py" --filename '*.py,*.py.in' \ client lib/cpopen/*.py lib/vdsm/*.py lib/vdsm/*.py.in tests vds_bootstrap vdsm-tool vdsm/*.py vdsm/*.py.in vdsm/netconf vdsm/sos/vdsm.py.in vdsm/storage vdsm/vdsm vdsm_api vdsm_hooks vdsm_reg vdsm/storage/imageRepository/formatConverter.py:280:29: E128 continuation line under-indented for visual indent - How can the quality of the vdsm builds be increased? It is frustrating to spend time on testing and then the hosts cannot even be installed to broken vdsm rpms. - How are the builds prepared? Is there a Jenkins job that prepares "stable" rpms in addition to the nightly job? Or is this totally handcrafted? - How can it be that the rpm spec differs between the 3.3 branch and released rpms? What is the source/branch for el6 vdsm rpms? Maybe I'm just tracking on the wrong source tree... Thx and Regards Patrick -- Lobster LOGsuite GmbH, Münchner Straße 15a, D-82319 Starnberg HRB 178831, Amtsgericht München Geschäftsführer: Dr. Martin Fischer, Rolf Henrich

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[Users] EL5 support for VirtIO SCSI?
by Paul Jansen 16 Nov '13

16 Nov '13

---1504104896-299338706-1384321468=:29063 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable I have just set up an Ovirt 3.3.0 install and have done a test install of C= entos 6.4 in a VM.=A0 The VM was configured with an IDE drive and a virtio-= scsi drive.=A0 The Centos 6.4 install sees both drives OK.=0AI'm wanting to= do some testing on a product that is based on EL5, but I'm finding that it= cannot see the virtio-scsi drive.=A0 It does show up in the output of 'lsp= ci', but I don't see a corresponding 'sd' device.=0A=0AI've just tried inst= alling Centos 5.10 and the support is not there.=0A=0ADoes anyone know of a= ny tricks to allow EL5 to see the virtio-scsi device? ---1504104896-299338706-1384321468=:29063 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable <html><body><div style=3D"color:#000; background-color:#fff; font-family:ti= mes new roman, new york, times, serif;font-size:12pt"><div>I have just set = up an Ovirt 3.3.0 install and have done a test install of Centos 6.4 in a V= M.  The VM was configured with an IDE drive and a virtio-scsi drive.&n= bsp; The Centos 6.4 install sees both drives OK.</div><div>I'm wanting to d= o some testing on a product that is based on EL5, but I'm finding that it c= annot see the virtio-scsi drive.  It does show up in the output of 'ls= pci', but I don't see a corresponding 'sd' device.<br></div><div>I've just = tried installing Centos 5.10 and the support is not there.</div><div><br></= div><div style=3D"color: rgb(0, 0, 0); font-size: 16px; font-family: times = new roman,new york,times,serif; background-color: transparent; font-style: = normal;">Does anyone know of any tricks to allow EL5 to see the virtio-scsi= device?<br></div><div style=3D"color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: trans= parent; font-style: normal;"><span><br></span></div></div></body></html> ---1504104896-299338706-1384321468=:29063--

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Re: [Users] from irc
by Bob Doolittle 15 Nov '13

15 Nov '13

Hi, I had a question on IRC regarding sysprep/sealing of Windows VMs and use in Pools. Basically, if you follow the Quick Start Guide, it says to seal the VM and shut it down before making the Template. My problem with this is that when you start a VM from the Pool, it takes forever to unseal - i.e. to repersonalize itself. That's a bad experience from a VDI perspective - you want the user to get a desktop they can start using ASAP. Itamar responded to me directly via e-mail: > bobdrad: on your question of windows VMs from pool - you can start > them once with an admin for the sysprep to happen, then shut them down. > admin launch of VMs doesn't create a stateless snapshot and > manipulates the VM itself. This raises some questions. I'd love to understand this better. He's asked me to cross this conversation onto the Users list now. 1. My understanding is that a Pool clones VMs on demand from a template. So how does the admin "launch" the template? I thought the only way to exercise a pool is from the User Portal. Is it sufficient to do that as Admin? I thought the persistence only came when launching a VM from the Admin Portal. 2. My understanding of "sealing" a system is that this depersonalizes it - e.g. removes hostname, prepares network for reinitialization, etc. And that the next time the system boots up it re-personalizes. So if one were to restart it, even as admin, this would reverse the sealing process, which would seem to make sealing in the first place pointless. What am I missing? At the moment I don't see the point of sealing a VM before putting it into the Pool (assuming you're using DHCP, anyway). What happens if you don't? Thanks, Bob P.S. I note the behavior of Fedora vs RHEL 6 is quite different in this regard. If you follow the "sealing" process on the Quick Start page for Fedora it seems to have no visible effect, but on RHEL 6 it puts you through a re-personalization dialog which is rather extensive (and again, not really suitable for VDI use).

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[Users] Trusted Pools and CentOS 6 packages
by Gianluca Cecchi 15 Nov '13

15 Nov '13

Hello, based on http://www.ovirt.org/Trusted_compute_pools_deployment#Provision_White_List_… The commands of kind: bash_oat_cert .. bash oat_oem ... are to be run on hypervisor host side, correct? Where can I find these packages for CentOS 6? Thanks in advance Gianluca PS: I took the time to correct a typo in client section where it said "Yum Install oat server package from fedora19 repository" instead of "Yum Install oat client package from fedora19 repository"

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[Users] Change data domain
by Juan Pablo Lorier 15 Nov '13

15 Nov '13

Hi, I'm changing the master domain to a new added one. I've placed the old in maintenance and ovirt made the change of master to the new one. The thing is that now that I have both active, I get this error: Sync Error on Master Domain between Host Dell2 and oVirt Engine. Domain: IBM3300 is marked as Master in oVirt Engine database but not on the Storage side. Please consult with Support on how to fix this issue. How can I fix this? Another thing, is there a way of having two iscsi data domains mirrored? To have a sort of high availability in the data domains. Regards,

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Re: [Users] Installation of self hosted engine
by Doron Fediuck 15 Nov '13

15 Nov '13

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[Users] Backup export domain
by "Saša Friedrich (BiTLAB)" 15 Nov '13

15 Nov '13

Hi, is there a way to backup export domain (exported vm-s and templates), reinstall complete oVirt sistem (engine, hosts) and restore those backups? tnx

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