Date: Fri, 03 Jan 2014 09:43:24 -0800 From: Peter Grehan <grehan@freebsd.org> To: Andrea Brancatelli <abrancatelli@schema31.it> Cc: freebsd-virtualization@freebsd.org Subject: Re: Real Device with BHyve Message-ID: <52C6F6BC.6070108@freebsd.org> In-Reply-To: <CADfWLen8WsBHU51%2B8vU_71js3-DCFa13DTakbDLoWRmhAu6XHw@mail.gmail.com> References: <CADfWLen8WsBHU51%2B8vU_71js3-DCFa13DTakbDLoWRmhAu6XHw@mail.gmail.com>
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Hi Andrea, > Well, the machine starts ok but when the "child" FreeBSD starts > installation something strange happens. When I get to the partitioning > screen I can see the device avaiable as /dev/vtdb0 with the correct size > and such. I choose autopartitioning, the installer writes the partition > table but when it start to write /dev/vtdb0p2 a very cryptic error appears > about being unable to write - sorry, did not write it down. > > The installer then stops. > > If I do a fdisk /dev/vtdb0 in the VM I can see the GPT partition being > there. If I do a fdisk /dev/da2 on the host machine, I can see the GPT > partition as well, but the VM just doesn't want to write on it. > > I even tried changing kern.geom.debugflags=16 as I thought the host machine > could be locking somehow the drive, but that didn't seem to make any > difference. I know it was a lame check but I was out of ideas. > > So I just wanted to understand if such a scenario is supposed to be > supported.... It is. Been a while since I've done this but will try a repro. Other folk have supported success using zvols so I'd assumed it was working. > What I was thinking of, for example, was of having an external iSCSI device > connected on the hostmachine mapped as a virtual disk for a specific VM, in > order to speed the VM disk performances. Yes, that's one of the scenarios in mind. > Just another quick question... I have seen some improvements by having the > VM's virtual disk on ZFS against UFS. Is it just me or is there any real > improvement by using ZFS? Difficult question to answer - probably workload-dependent. later, Peter.
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