[Users] scsi disks inside VMs?

[Andrew Cathrow]

----- Original Message ----- 

> From: "Paul Jansen" <vlaero at yahoo.com.au>
> To: users at ovirt.org
> Sent: Wednesday, March 27, 2013 10:52:17 PM
> Subject: [Users] scsi disks inside VMs?

> Hello.
> I'm wondering if it is possible to create VMs with ovirt that have
> scsi disks?
> I've just installed ovirt 3.2.1 on Fedora 18 and attached an ovirt
> node (the current fedora 18 based version).

> When adding disks to a VM I can chose from the 'IDE' or 'VirtIO'
> interfaces. I'd like a scsi option also.
> Mainly because when migrating from vsphere VMs this makes things
> simpler.
> Also, my current kickstart installer for various OSes does not yet
> handle 'vd' disks.
> To add to things I need to install a custom filesystem on the vms
> that wants a scsi disk. It does a scsi inquiry early on in the
> install phase and will not work in 'vd' disks. ie: ' sg_inq
> /dev/vda' does not work.

> I also know that the libata driver in recent linux distributions
> exposes IDE drives as scsi and allows a scsi enquiry to succeed.
> Unfortunately the use case I have required Enterprise Linux 5 and in
> this release IDE disks report as 'hd', whereas scsi disks report as
> 'sd'. So, I can just use an IDE disk to get around this problem.

> I understand that virt-manager will allow attaching scsi disks to KVM
> based virtual machines, and that this is made possible by recent
> changes in libvirt.

> I think we should be encouraging people to use the virtio disks where
> possible, but in cases where this is not straightforward ovirt - and
> RHEV - are missing a trick as far as allowing people that have
> existing vsphere setups to fairly easily move to ovirt.

> Is a 'scsi' interface' option for adding virtual disks for VMs on the
> roadmap? If not, could it be considered?


There are plans to add support for virtio-scsi - still paravirtualized but providing a pv scsi controller that gives us more features - such as passing scsi commands to luns, allowing more disks per vm etc.


> Thanks.

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