On Mar 25, 2013, at 1:46 PM, John Nielsen <[email protected]> wrote:
> On Mar 22, 2013, at 8:14 AM, Paul Mather <[email protected]> wrote: > >> I'm running FreeBSD 9-STABLE as a guest under RHEL 6.4 KVM virtualisation. >> I have networking and storage in the FreeBSD guest using the Virtio drivers >> (with the virtual disk set to "Virtio" in the definition on the host). >> Everything is working nicely: I have a vtnet network adapter and see vtbd >> devices for my virtual disks in FreeBSD. Performance is much better >> compared with an emulated IDE device. > > I've had the same experience. > >> The odd thing is that I don't see GEOM labels reflected in /dev. For >> example, I have GPT labels defined in the guest, but I don't see them show >> up under /dev/gpt. Similarly, my UFS labels don't show up under /dev/ufs. >> I *do* see a /dev/gptid. That appears to be the only label that shows up. > > I have not encountered this issue. I use virtio block devices and GPT labels > exclusively in multiple FreeBSD 9.1 guests and all mount/function without > issue. How are you referring to your filesystems in /etc/fstab? IIRC GEOM > makes not-in-use labels disappear when a device is in use (e.g. mounted). If > you take a new device, put a labeled GPT partition on it and a labeled UFS > partition on that but don't mount anything, what happens? Thanks for the reply. My apologies: this is a case of pilot error on my part. I was mounting the devices as /dev/vtbd... I hadn't realised that the present-but-unused labels were being suppressed when the device was mounted. Has this always been the case? For some reason I had a distinct recollection stuck in my mind that all labels showed up in /dev. Anyway, many thanks for pointing the way to the solution. I now have GPT- and UFS-labelled devices mounted in my FreeBSD guest system. > >> Is there something special I need to do to get GPT and UFS labels to appear >> when using Virtio? It seems to me that Virtio block devices appear to be >> somewhat unusual. Unlike regular ATA and SCSI devices, my vtbd devices >> don't appear in the boot dmesg (although a vtblk device does), and >> "camcontrol devlist" does not list them. It's not clear to me how I am >> supposed to interact with them other than via basic device I/O through >> /dev/vtbdX. I thought that the virtio_scsi module might make them appear as >> "da" devices and able to interacted with via camcontrol, but this doesn't >> seem to be the case. > > Virtio block devices and virtio SCSI devices are not the same. If you want to > use the virtio_scsi module in FreeBSD you should expose a virtio SCSI device > from the host. Thank you for the explanation. I've been using virt-manager up to now for setting up KVM guests and it seems that virtio-scsi isn't exposed through that interface---only through the command line. I'll have to investigate... Cheers, Paul. _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
