Displaying 20 results from an estimated 7000 matches similar to: "Block device IO limits"
2012 Oct 29
1
libvirt and cgroups/blkio
Hi,
is there a way to configure blkio via libvirt (xml)?
Regards
Erkan
--
?ber den grenzen mu? die freiheit wohl wolkenlos sein
2014 Jun 27
1
libvirt on OpenStack
Hi,
I am running OpenStack Cluster and use libvirt + cgroup to limit vm’s performance
https://wiki.openstack.org/InstanceResourceQuota
What I am confusing is..
1. After running a vm instance with some croup limit applied, I can’t find any related cgroup settings.
2. Can I change limit value after instance is running? like change disk_read_iops_sec from 10 to 20.
One of the xml file like below.
2018 Aug 08
3
Mount URL as cdrom/iso KVM/QEMU
Hi Folks,
According to the examples in http://libvirt.org/formatdomain.html#elementsDisks it should be possible to mount an iso /url as a cdrom, the example given is:
</disk>
<disk type='network' device='cdrom'>
<driver name='qemu' type='raw'/>
<source protocol="http" name="url_path">
<host
2010 May 25
2
How to obtain rights to extend libvirt documentation pages
For example, http://libvirt.org/formatdomain.html#elementsDisks
does not contain <serial>xxxx</serial> tag.
(https://bugzilla.redhat.com/show_bug.cgi?id=593266)
I wrote to community (users and developers). No one has added this
information to the site...
--
Segmentation fault
2014 Aug 25
2
help? looking for limits on in-flight write operations for virtio-blk
Hi,
I'm trying to figure out what controls the number if in-flight virtio
block operations when running linux in qemu on top of a linux host.
The problem is that we're trying to run as many VMs as possible, using
ceph/rbd for the rootfs. We've tripped over the fact the the memory
consumption of qemu can spike noticeably when doing I/O (something as
simple as "dd" from
2014 Aug 25
2
help? looking for limits on in-flight write operations for virtio-blk
Hi,
I'm trying to figure out what controls the number if in-flight virtio
block operations when running linux in qemu on top of a linux host.
The problem is that we're trying to run as many VMs as possible, using
ceph/rbd for the rootfs. We've tripped over the fact the the memory
consumption of qemu can spike noticeably when doing I/O (something as
simple as "dd" from
2017 Aug 02
2
Libvirt fails on network disk with ISCSI protocol
Hi,
I am working on oVirt, and I am trying to run a VM with a network disk with
ISCSI protocol ( the storage is on a Cinder server).
Here is the disk XML I use:
<disk device="disk" snapshot="no" type="network">
<address bus="0" controller="0" target="0" type="drive"
unit="0" />
2013 May 09
1
Getting libvirt Error when setting IO tune read_bytes_sec value using libvirt API virDomainSetBlockIotune
Hi All,
I am setting the value for "read_bytes_sec" using the following API code
virDomainSetBlockIoTune(dom, "/mnt/tmpsdb/FileVM1", parainfoPtr, nparams,
2);
I am succesfully able to set this value and i can read it back using the API
virDomainGetBlockIoTune(dom,"/mnt/tmpsdb/FileVM1",parainfoPtr,&nparams,2);
But after setting this value when i shutdown
2015 May 30
2
snapshots and vmdk
Does libvirt support snapshotting when the virtual disk comes from a vmdk file?
http://wiki.libvirt.org/page/Snapshots#Desired_functionality seems to say no, since it says "'virsh snapshot', which requires all disk images to be qcow2".
OTOH, man virsh, http://libvirt.org/formatsnapshot.html, and http://libvirt.org/formatdomain.html#elementsDisks seem to indicate more
2010 May 19
1
Update of libvirt website required. not all information about XML tags
The problem desribed here: https://bugzilla.redhat.com/show_bug.cgi?id=593266
Please update http://www.libvirt.org/formatdomain.html and describe
NEW xml tags, like <serial>xxxx</serial> for hard drive and all cpu
tags, other if any.
--
Segmentation fault
2013 Sep 20
2
Re: Incremental Backups
On 2013-09-20 15:41, Davide Guerri wrote:
> Hi Thomas,
Hello Davide.
> I'm using this script which leverages external snapshots and
> blockpull: https://github.com/dguerri/LibVirtKvm-scripts
Yeah. I saw that and tried this already. But it needs to be adjusted to
libvirtd-1.1.2 i think. Can you do this? I fiddled a litte bit around
but wasn't realy successfull.
hn
2020 May 28
2
Re: Provide NBD via Browser over Websockets
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
2013 Sep 20
5
Incremental Backups
Hello.
Is someone performing incremental backups via libvirt for qemu/kvm
machines? I'm still having a hard time to
find a nice procedure. I mean is it possible to make a full backup of an
image on monday a do the next days of the week
incremental backups?
Another way could be mount the image and rsync its contents. Does that
makes sense?
Also i read in qemu changelog:
---
Support for a
2013 Sep 20
1
Re: Incremental Backups
On 2013-09-20 16:05, Davide Guerri wrote:
> Hi
>
>> hn LibVirtKvm-scripts # ./fi-backup.sh -b /opt/virt-backup-local/ -d
>> serve.lordcritical
>> [DEB] qemu-img version '1.6.0' is supported
>> [DEB] KVM version '1.6.0,' is supported
>> [DEB] Snapshot for domain 'serve.lordcritical' requested
>> [DEB] Using timestamp
2010 Oct 26
1
List volumes of a domain
Hi all,
I'm using libvirt java binding (libvirt-java-0.4.6)
I'd like to know if the Domain class offers an API to query volumes
attached to a particular domain or should I parse the XML domain
description?
Thanks for your support
--
Andrea Turli
Ricercatore
Direzione Ricerca e Innovazione
andrea.turli at eng.it
Engineering Ingegneria Informatica spa
Via Riccardo Morandi, 32 00148
2011 Apr 18
1
kvm virtual server boot order
The boot order issue
http://osdir.com/ml/libvir-list/2009-08/msg00398.html
resolved with the code changes specified by
http://www.redhat.com/archives/libvir-list/2009-August/msg00340.html
seems to suggest that hard disks, cdroms, floppy devices (since they are
all disks) are ordered primarily by virtual bus type as encountered in the
domain xml. This indicates that there can exist a
2015 Jan 30
1
Disk space exhaustion
Hello,
what happens when an instance writes data with 0% available physical
disk space, on QCOW2 images for instance, apart from destruction and
unpredictability?
I'm aware that monitoring is mandatory in production environments, but
are there other known industry tricks to deal with this? Soft/hard limit
settings, autopause/stop, or does KVM react in doing force shut down the
VM in
2019 Aug 14
2
Re: Libvirt API for attaching volume to domain
Thanks, this is exactly what I needed.
Is there some documentation where I can get how to exactly call this
function along with the arguments?
On Wed, Aug 14, 2019 at 6:48 PM Peter Krempa <pkrempa@redhat.com> wrote:
> On Wed, Aug 14, 2019 at 18:23:30 +0530, Varsha Verma wrote:
> > Hi,
> >
> > I wanted to know if there is any Python API exposed for libvirt using
2014 Dec 18
1
Virtual machine removal through command line.
Hi,
Until today, I hadn't found a way to cleanly remove a KVM virtual machine
through command line on CentOS 6 or 7! I had to run 'systemctl restart
libvirtd' or 'service libvirtd restart'
After several months (!!!), I found this thread:
https://github.com/pradels/vagrant-libvirt/issues/107
Now, I know how to cleanly remove a KVM virtual machine (with default file
location):
2013 Mar 19
2
Errors while using blkiotune command
Hi all,
I want to limit the I/O bandwidth inside the container, so I used virsh
command blkiotune. But when I enter a command:
virsh # blkiotune lxcguest --weight 250
I get following errors:
error: Unable to change blkio parameters
error: Requested operation is not valid: blkio cgroup isn't mounted
I also have blkio cgroup mounted. What can be the problem?
Thanks in advance.
Regards,