similar to: mkfs fails on qemu-nbd device

On Thu, Jun 27, 2019 at 16:22:27 +0530, Tanmoy Sinha wrote: > Hi All, > > I am unable to figure out the issue here, when I try to create a filesystem > (ext4) on a virtual disk using qemu-nbd. This happens intermittently. > > Following is the sequence of commands:- > > $> qemu-img create -f qcow2 test.qcow2 30G > > > $> qemu-nbd --connect=/dev/nbd0

Hi, So I've been hacking together an nbdkit plugin (similar to the "file" plugin, but it splits the file up into chunks): https://github.com/pepaslabs/nbdkit-chunks-plugin I got it to the point of being a working prototype. Then I threw it onto a raspberry pi, which it turns out only has a 50/50 shot of fallocate() working correctly. I'm checking the return code of

I am trying that out. Debian 9 (stretch) backports still doesn't have 4.16 kernel. So I building the kernel from the source. Will keep you posted. On Mon, 26 Mar 2018 at 13:00 Richard W.M. Jones <rjones@redhat.com> wrote: > [Adding Paolo and Vitaly, but FYI only as the bug seems to have an > upstream fix already.] > > On Mon, Mar 26, 2018 at 09:13:45AM +0300, Roman Kagan

Yes it works if I use force_tcg env variable On Sat, 24 Mar 2018 at 4:37 AM, Richard W.M. Jones <rjones@redhat.com> wrote: > > On Fri, Mar 23, 2018 at 05:35:38PM +0000, Tanmoy Sinha wrote: > > Thanks. Reading the defect and the associated thread in > > https://bugs.launchpad.net/qemu/+bug/1661386, I enabled performance > > counters in VMWare guest settings. Now the

On Sat, Nov 07, 2015 at 12:21:29AM -0600, Jason Pepas wrote: > Hi, > > So I've been hacking together an nbdkit plugin (similar to the "file" > plugin, but it splits the file up into chunks): > https://github.com/pepaslabs/nbdkit-chunks-plugin > > I got it to the point of being a working prototype. Then I threw it > onto a raspberry pi, which it turns out

Thanks. Reading the defect and the associated thread in https://bugs.launchpad.net/qemu/+bug/1661386, I enabled performance counters in VMWare guest settings. Now the kvm assertion `ret == cpu->kvm_msr_buf->nmsrs' is gone. But the qemu/kvm hangs after printing "SeaBIOS (version 1.10.2-1)" I presume this too is a qemu/kvm issue for vmware platforms. Is there any existing issue

2017-07-27 20:18 GMT+08:00 Richard W.M. Jones <rjones@redhat.com>: > On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote: > > I can mount qcow2 img to nbd devices through guestfish or qemu-nbd > > > > I'm curious about which performance is better? > > They do quite different things, they're not comparable. > > Can you specifically give the

2017-07-28 0:31 GMT+08:00 Richard W.M. Jones <rjones@redhat.com>: > On Fri, Jul 28, 2017 at 12:23:04AM +0800, lampahome wrote: > > 2017-07-27 20:18 GMT+08:00 Richard W.M. Jones <rjones@redhat.com>: > > > > > On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote: > > > > I can mount qcow2 img to nbd devices through guestfish or qemu-nbd > >

On Sat, Mar 24, 2018 at 03:08:16PM +0000, Tanmoy Sinha wrote: > Even though force_tcg works, I intend not to run it on emulation. Is there > way I can run it over kvm? The other observation is, without force_tcg if I > use the machine type as *pc-i440fx-2.**1*,accel=kvm it works fine. The > default machine type for my host *pc-i440fx-2.8, *which seems to crib. I don't know, but

Hi, I am currently facing an issue with libvirt w.r.t a guest's state and reason code. Precisely following are steps: 1. I have a running guest named *linux-test *on KVM 2. I do a * $> virsh save linux-test linux-saved.dat* 3. At this point * $> virsh domstate --reason linux-test *shows *shutoff(saved)* 4. I restarted the libvirtd daemon * $>systemctl

On Sat, Nov 7, 2015 at 5:03 AM, Richard W.M. Jones <rjones@redhat.com> wrote: > How about 'strace mkfs.ext2 ..' and see if any system calls are > returning errors. That would show you whether nbd-client is throwing > errors away, or whether mkfs is getting the errors and ignoring them > (seems pretty unlikely, but you never know). > > After that, it'd be down

Hi, I would like to get a clear picture on external snapshots memory dump ( i.e. system-checkpoint) vs dumping the memory of the guest. I have created external snapshots which produces a disk file and a memory file. I am not able to use this memory file in any memory analysis tools, for instance volatility. However, the memory dump taken through "virsh dump" works just fine with such

Thanks a lot for the detailed explanation. Currently I am taking a dump of the memory with the virsh dump ‘live’ flag and taking the snapshot with the memory file pointed to /dev/null, without even pausing the guest. I don’t have a use case to restore from the snapshot snapshot so hopefully this approach will not cause any issue. On Mon, 26 Nov 2018 at 5:23 PM, Peter Krempa

On Mon, Oct 15, 2018 at 10:28:25AM -0400, Raghuram Devarakonda wrote: > On Mon, Oct 15, 2018 at 3:54 AM Richard W.M. Jones <rjones@redhat.com> wrote: > > > > [Adding libguestfs mailing list] > > > > On Sun, Oct 14, 2018 at 11:53:17AM -0400, Raghuram Devarakonda wrote: > > > Hi, > > > > > > In our project, we deal with quite large sparse

[Adding linux-ext4 mailing list. The original bug report is here: https://www.redhat.com/archives/libguestfs/2015-November/msg00078.html ] On Sat, Nov 07, 2015 at 01:22:45PM -0600, Jason Pepas wrote: > On Sat, Nov 7, 2015 at 5:03 AM, Richard W.M. Jones <rjones@redhat.com> wrote: > > How about 'strace mkfs.ext2 ..' and see if any system calls are > > returning errors.

I have a system with a large LVM VG partition. I was wondering if there is a way i could share the partition using nbd and have the nbd-client have access the LVM as if it was local. SYSTEM A: /dev/sda3 is a LVM partition and is assigned to VG volgroup1. I want to share /dev/sda3 via nbd-server SYSTEM B: receives A''s /dev/sda3 as /dev/nbd0. I want to access it as VG volgroup1. I am

On Mon, 15 Oct 2018, Nir Soffer wrote: > On Sat, Oct 13, 2018 at 9:45 PM Eric Wheeler <nbd@lists.ewheeler.net> wrote: > Hello all, > > It might be neat to attach ISOs to KVM guests via websockets.  Basically > the  browser would be the NBD "server" and an NBD client would run on the > hypervisor, then use `virsh change-media vm1 hdc

I am using a debian 9 guest, hosted on a ESXi platform with nested virtualisation enabled. On this debian 9 guest when I run libguesfs-test-tool, it fails with an error: "qemu-system-x86_64: /build/qemu-DqynNa/qemu-2.8+dfsg/target-i386/kvm.c:1805: kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed." Instead when I use a wrapper script and hook it with the env

On Thu, 28 May 2020, Richard W.M. Jones wrote: > On Thu, May 28, 2020 at 12:24:22AM +0000, Eric Wheeler wrote: > > On Mon, 15 Oct 2018, Nir Soffer wrote: > > > On Sat, Oct 13, 2018 at 9:45 PM Eric Wheeler <nbd@lists.ewheeler.net> wrote: > > > Hello all, > > > > > > It might be neat to attach ISOs to KVM guests via websockets. 

I can mount qcow2 img to nbd devices through guestfish or qemu-nbd I'm curious about which performance is better?