search for: nbd0

...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 fallocate(), and my chunks_pwrite() returns -1 if it fails. No problems there. When I run mkfs.ext2 /dev/nbd0 on the client, I see this on the nbd-server: nbdkit: chunks[1]: error: Unable to fallocate '/home/cell/nbds/default/chunks/00000000000000030723' nbdkit: chunks[1]: error: Unable to fallocate '/home/cell/nbds/default/chunks/00000000000000030724' nbdkit: chunks[1]: error: Unable to...

...totype. 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 fallocate(), and my chunks_pwrite() > returns -1 if it fails. No problems there. > > When I run mkfs.ext2 /dev/nbd0 on the client, I see this on the nbd-server: > > > nbdkit: chunks[1]: error: Unable to fallocate > '/home/cell/nbds/default/chunks/00000000000000030723' > nbdkit: chunks[1]: error: Unable to fallocate > '/home/cell/nbds/default/chunks/00000000000000030724' > n...

Hi. We get the errors below in the kernel logs. WARNING: Kernel Errors Present Buffer I/O error on device nbd0, ...: 27 Time(s) Buffer I/O error on device nbd16,...: 3 Time(s) end_request: I/O error, dev nbd0, secto...: 13 Time(s) end_request: I/O error, dev nbd1, secto...: 7 Time(s) end_request: I/O error, dev nbd10, sect...: 7 Time(s) I see someone else has reported this error message. E.g. see: http://...

...large sparse file but would > like to keep the file on disk itself in compact format. So we are not > talking about a file system but a single file. I guess this means > creating qcow2 disk and attach as a local device? I'm still a little unclear, but most likely: qemu-nbd -c /dev/nbd0 file.qcow2 qemu-nbd -d /dev/nbd0 The first command will attach file.qcow2 to /dev/nbd0, making it appear as a normal host device. The second will detach it. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: htt...

...Read my programming and virtualization blog: http://rwmj.wordpress.com > Fedora Windows cross-compiler. Compile Windows programs, test, and > build Windows installers. Over 100 libraries supported. > http://fedoraproject.org/wiki/MinGW > guestfish: guestfish --rw -a demo.qcow2 -m /dev/nbd0 qemu-nbd: qemu-nbd -c /devnbd0 demo.qcow2 I just want to mount demo.qcow2 to a device

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 test.qcow2 $> *mkfs.ext4 /dev/nbd0* * mkfs.ext4: Device size reported to be zero. Invalid partition specified, or* *Thu Jun 13 14:44:24 2019 partition table wasn't reread after running fdisk, due to* *Thu Jun 13 14:44:24 2019 a modified partition being busy and in use. You may need to re...

...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 hoping this will allow me to share LV partitions on volgroup1 which is used by XEN domUs. I think i read something about CLVM. Will this allow me to do what I want? how do i go about setting up a clvm? TIA, Tomoki ___________________________________...

...ler.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 --insert /dev/nbd0` could > use an ISO from my desk to boot from. > > Here's an HTML5 open file example: > https://stackoverflow.com/questions/3582671/how-to-open-a-local-disk-file-with-javascript > > and the NBD protocol looks simple enough to implement in javascript:...

...gt; > > They do quite different things, they're not comparable. > > > > > > Can you specifically give the commands you are trying? We might be > > > able to give more sensible advice. > > > > guestfish: > > guestfish --rw -a demo.qcow2 -m /dev/nbd0 > > > > qemu-nbd: > > qemu-nbd -c /dev/nbd0 demo.qcow2 > > These don't do the same thing. In fact the guestfish command doesn't > work at all. > > > I just want to mount demo.qcow2 to a device > > Still unclear. > > You want to export demo.qc...

While I was thinking about what I'd write for my proposed nbdkit talk at FOSDEM next year, this strikes me as clunky: rm -f /tmp/sock nbdkit -U /tmp/sock file foo nbd-client -u /tmp/sock /dev/nbd0 ... nbd-client -d /dev/nbd0 killall nbdkit In qemu-nbd, all that is just this: qemu-nbd -c /dev/nbd0 foo It seems like it would be nice to implement an ‘nbdkit -c /dev/nbdX’ option. My first idea was: nbdkit -c /dev/nbdX ==> nbdkit -U [sock] &...

I either haven't searched for the right thing or the web doesn't contain the answer. I have used the following to mount an image and now I need to know the proper way to reverse the process. qemu-nbd -c /dev/nbd0 <qcow2 image using lvm> vgscan --cache (had to use --cache to get the qemu-nbd volume to be recognized, lvmetad is running) vgchange -ay lvdisplay mount <selected qemu-nbd related 'LV Path' found from lvdisplay above> <mount point> I have do...

hello, I would only like to have guestmount in my toolkit to read-only vhd/vhdx images, so I try to compile libguestfs with a minimum of dependencies. I downloaded the 1.38-stable sources, installed the necessary dependencies and compiled them with the command : ./configure --disable-ocaml --disable-perl --disable-ruby --disable-haskell --disable-php --disable-erlang --disable-lua

...gt; > > > > > 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 --insert /dev/nbd0` could > > > use an ISO from my desk to boot from. > > > > > > Here's an HTML5 open file example: > > > https://stackoverflow.com/questions/3582671/how-to-open-a-local-disk-file-with-javascript > > > > > > and the N...

[Adding libguestfs mailing list] On Sun, Oct 14, 2018 at 11:53:17AM -0400, Raghuram Devarakonda wrote: > Hi, > > My name is Raghuram Devarakonda and I am a big fan of "nbdkit". I have > successfully used it to prototype (using Python plugin) a complex > project in our company and since then, I have also been trying to > understand and learn "guestfs-tools"

Considering that the technic of SPDK + QEMU is making progress toward maturity. Personally I'd like to do the integration work. Not sure somebody would mind to give me some clue on that? Because I'm not familiar with libguestfs code structures. Thanks, Bob

...performance is better? > > > > They do quite different things, they're not comparable. > > > > Can you specifically give the commands you are trying? We might be > > able to give more sensible advice. > > guestfish: > guestfish --rw -a demo.qcow2 -m /dev/nbd0 > > qemu-nbd: > qemu-nbd -c /dev/nbd0 demo.qcow2 These don't do the same thing. In fact the guestfish command doesn't work at all. > I just want to mount demo.qcow2 to a device Still unclear. You want to export demo.qcow2 as NBD? Use qemu-nbd. You want to mount demo.qcow2...

...On 10/13/18 1:39 PM, Eric Wheeler 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 --insert /dev/nbd0` could > use an ISO from my desk to boot from. Are you using qemu as the hypervisor? If you are using something else, like vmware, then using the kernel NBD module as the NBD client to expose the browser-as-server via /dev/nbd0 is reasonable since practically any hypervisor will attach to a...

...k build directory. This is because the build machines have only SD-cards as local disk and SD is both slow and unreliable. The builders (NBD clients) are set up with an /etc/rc.d/rc.local file which runs these commands on boot: modprobe nbd nbd-client -b 512 nbd.server.example.com 10809 /dev/nbd0 mount /dev/nbd0 /var/lib/mock The /var/lib/mock directory is essentially temporary and doesn't need to persist across boots or even mounts. Ideally every time the client connects over NBD we'd get a fresh ext4 filesystem. Also note as there are multiple clients they must all see a fres...

Hi Eric, I wonder if you have any thoughts about this build failure in tests/test-nozero.sh? https://koji.fedoraproject.org/koji/taskinfo?taskID=48259627 log: https://kojipkgs.fedoraproject.org//work/tasks/9762/48259762/build.log The error is “nozero6.img was trimmed by mistake”. I added “set -x” to the script earlier today so we can see exactly what's wrong, and it is that: ++ stat

...gt; 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 --insert /dev/nbd0` could > > use an ISO from my desk to boot from. > > > > Here's an HTML5 open file example: > > https://stackoverflow.com/questions/3582671/how-to-open-a-local-disk-file-with-javascript > > > > and the NBD protocol looks simple enoug...