search for: centosvirt

It is our pleasure to renew our invite to oVirt 2020 online conference and announce free registration <https://www.eventbrite.it/e/ovirt-2020-online-conference-registration-111989694190?aff=centosvirt> is now open. The conference,organized by oVirt community, will take place online on Monday, September 7th 2020! You can read updated information about the conference at https://blogs.ovirt.org/ovirt-2020-online-conference/ A kind reminder that if you'd like to present at the conference, th...

On 11/01/2015 12:07 PM, Karel Hendrych wrote: > Hi, just a heads-up: 3.18.21 didn't boot up on HP ML310e Gen8 v2, SATA drives in AHCI mode, / on software raid 1, no LVM. It ended up in kernel panic > with unable to mount root fs. Attached. No difference in grub kernel/xen settings. > > I didn't investigate the things deeper so far. 4.4.3-3/3.18.17 is booting fine. > >

On Sat, Sep 12, 2015 at 01:35:48AM +0200, Karel Hendrych wrote: > Comparing simple dd bs=1M count=10000 on dom0 vs domU. Qemu driver > is achieving pretty much the same like dom0. > So you're measuring buffered speed. Try measuring non-buffered (iflag=direct or oflag=direct, depending if you're reading or writing). -- Pasi > Thanks > -- > Karel > > On 7.9.2015

Hi, I am seeing frequent libvirtd hangs (clients not responding) after last CentOS6-Xen update : libvirt-libs-4.1.0-2.xen46.el6.x86_64 libvirt-daemon-4.1.0-2.xen46.el6.x86_64 libvirt-daemon-driver-network-4.1.0-2.xen46.el6.x86_64 libvirt-daemon-driver-nwfilter-4.1.0-2.xen46.el6.x86_64 libgcc-4.4.7-18.el6_9.2.x86_64 2:qemu-img-0.12.1.2-2.503.el6_9.5.x86_64

Hi, after migrating to libvirt/libxl according to: https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt I've noticed that my Xen PV domains are being launched by qemu-system-i386 running under root privileges. I am wondering why is this? Previously no qemu process was used. If qemu is needed for some reason, are there any guidelines for non-root operation? Thanks -- Karel

... changing from: <driver name='file'/> to: <driver name='tap2'/> makes the domain start without QEMU. However I see much better performance with QEMU (close to dom0, tested using simple dd writes) than with tap2 driver. Is that expected? What's best practise to file based storage on latest CentOS6-xen (Kernel 3.18.17, Xen 4.4.2-7) Are there any guides

Comparing simple dd bs=1M count=10000 on dom0 vs domU. Qemu driver is achieving pretty much the same like dom0. Thanks -- Karel On 7.9.2015 21:45, Pasi K?rkk?inen wrote: > On Mon, Sep 07, 2015 at 05:47:39PM +0200, Karel Hendrych wrote: >> ... >> >> changing from: <driver name='file'/> to: <driver name='tap2'/> makes >> the domain start

Hi, just a heads-up: 3.18.21 didn't boot up on HP ML310e Gen8 v2, SATA drives in AHCI mode, / on software raid 1, no LVM. It ended up in kernel panic with unable to mount root fs. Attached. No difference in grub kernel/xen settings. I didn't investigate the things deeper so far. 4.4.3-3/3.18.17 is booting fine. Any similar experience? BR -- Karel -------------- next part

Indeed, a good catch. Module initramfs line was missing at 3.18.21 grub config. Thanks! -- Karel On 1.11.2015 21:46, Sarah Newman wrote: > On 11/01/2015 12:07 PM, Karel Hendrych wrote: >> Hi, just a heads-up: 3.18.21 didn't boot up on HP ML310e Gen8 v2, SATA drives in AHCI mode, / on software raid 1, no LVM. It ended up in kernel panic >> with unable to mount root fs.

Hi, is there any guide for CPU microcode updates on CentOS6, Xen 4.10, kernel 4.9 ? Thanks Karel

Good test, non-buffered dom0 dd write speed is similar with tap2. I'll likely stay with the QEMU backend. Are there any best practises regarding security, at least if QEMU can operate under non-root account? Cheers -- Karel On 12.9.2015 10:51, Pasi K?rkk?inen wrote: > On Sat, Sep 12, 2015 at 01:35:48AM +0200, Karel Hendrych wrote: >> Comparing simple dd bs=1M count=10000 on dom0

Hi, spot on! On 6.9.2015 12:56, Pasi K?rkk?inen wrote: > On Sun, Sep 06, 2015 at 09:08:50AM +0200, Karel Hendrych wrote: >> Hi, after migrating to libvirt/libxl according to: >> > > Hi, > >> https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt >> >> I've noticed that my Xen PV domains are being launched by >> qemu-system-i386 running

Have you tried to eliminate all power management features all over? Are the devices connected to the same network infrastructure? There has to be something common. I've been using Intel NICs with Xen/CentOS for ages with no issues. Karel On 27.1.2017 02:57, Kevin Stange wrote: > On 01/26/2017 02:08 PM, Kevin Stange wrote: >> On 01/26/2017 09:35 AM, Johnny Hughes wrote:

Bump. Folks, any ideas? Cheers Karel On 22.5.2018 11:33, Karel Hendrych wrote: > Hi, I am seeing frequent libvirtd hangs (clients not responding) after > last CentOS6-Xen update : > > libvirt-libs-4.1.0-2.xen46.el6.x86_64 > libvirt-daemon-4.1.0-2.xen46.el6.x86_64 > libvirt-daemon-driver-network-4.1.0-2.xen46.el6.x86_64 >