Xen is a hypervisor based virtualization. It supports x86, AMD64, IA64, ARM and other CPU types, and Linux, Windows, Solaris and *BSD guest operating systems.
4
votes
1answer
291 views
Difference between Processors and CPU core
can any one please clarify the difference between actual no of processors and CPU cores.
in my case i am having Intel Xeon® Processor E5620 as per intels product page: its having
# of Cores 4
# of ...
0
votes
2answers
114 views
Registering publicly Mail server and Web server in a free dns server
I'm trying to host the e-mails and the site of our company into our private server. I've already followed the Gentoo Virtual Mailhosting System with Postfix Guide and my mail server is working ...
1
vote
0answers
211 views
XenServer Offsite Replication
I am trying to find the best way to migrate my VHD's to my DataCenter offsite for DR purposes.
Currently I have a number of Xen Stacks setup as the following:
Dual RAID ISCSI SAN multipathed to at ...
2
votes
2answers
94 views
xen - what constitutes a 'system'?
In the release notes for Xen 4.2 this statement appears:
Large Systems: Following on from the improvements made in 4.1 Xen now supports
even larger systems, with up to 4095 host CPUs and up to ...
1
vote
1answer
344 views
Difference between Xen XCP ISO install and apt-get install xcp-xapi
I just got some new hardware and am planning testing out the Xen hypervisor and Xen Cloud Platform (XCP).. more specifically, I am using a intel i5 3470, H77 chipset, 16GB RAM, and 2x2TB Hard drives ...
1
vote
3answers
117 views
How to make a vm scale when demand for resource increases
i am having a server with 16 virtual core and 24G RAM,using Xen virtualization and ubuntu as dom0 Created 4 VMs (in para mode),each with different applications.
CPU Load vary on each vm,somtimes ...
2
votes
1answer
332 views
How to run .ova appliance on Debian Squeeze XEN host?
I have a virtual appliance in a .ova format, but I need to run it on a XEN host. Xen host is running Debian Squeeze.
How can I do that?
1
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0answers
94 views
XCP vm created via xl create doesn't show up in Xencenter neither in xe vm-list
i am running XCP 1.4.90.530.170661 and i have many PV guests running and created via XenCenter. I have created now an openwrt PV guest via the xl create command but it doesn't show up in Xencenter ...
0
votes
0answers
91 views
Can cgroups blkio be applied to Xen backend tap drivers?
Is it possible to use cgroups' blkio controller (proportional weight time in particular) on Xen backend tap drivers? Since they're just processes I don't see why not, but I haven't tried this and was ...
0
votes
1answer
362 views
What are the advantages and disadvantages of the various virtual machine image formats? [closed]
Xen and Virtualbox etc both support a range of different virtual machine image formats.
These are:
vmdk, vdi, qcow & qcow2, hdd & vhd.
Without any bias toward a particular product, I'm ...
0
votes
3answers
441 views
How to makesure VM is in Para virtualization mode on XEN?
I am having a server running XEN,with ubuntu 12.04 as Domain 0.
Intel VT is turned on by default and i dont want to run any Windows OS as VM.
So
1. how can i makesure that all the created VM will ...
1
vote
1answer
123 views
Is it possible to run Windows as a Xen VM without VT, using Qemu-dm?
Is it possible to run windows as a virtual machine under Xen using qemu-dm? If so, how can it be done?
Since Xen without VT technology supports only para-virtualization, can qemu-dm, the emulator ...
1
vote
1answer
116 views
Disabling Host-to-Guest time sync in EC2 windows
In an EC2 instance (Xen Virtualized) is it possible to disable time sync on a Guest VM by Host VM.
I found that it can be done on Linux instance by modifying xen.independent_wallclock=1
Is there any ...
0
votes
1answer
814 views
Machine check events logged
In /var/log/messages, this error occurred:
Sep 19 13:18:15 wdc kernel: [2772302.630416] Machine check events logged
Shortly there after, the entire server became unresponsive. This is in the log of ...
1
vote
0answers
80 views
Ubuntu 10.04 Xen guest - why would time drift be proportionate with the system load?
We are trying to troubleshoot an issue with random system lockups during medium - heavy loads on an Ubuntu MySQL 5.1 server.
There is nothing logging into the system during these lockups. The only ...
0
votes
1answer
64 views
Xen Time Sync Issue after Conversion to VMWare
I have a Windows 7 system that was converted from Xen to VMWare ESXI 5.0. Problem is i think the Xen sync is still adjusting the time 3 hours into the future. Is there any way I can disable this ...
0
votes
2answers
135 views
How can a cloud be created from virtualization or how is it different from virtualization?
I have heard that virtualization is the basis of Cloud,so If i have a machine with xen as virtualizing environment and many vms running on it,then can that be called as a cloud.
Is it true that vms ...
2
votes
1answer
589 views
Windows 8 virtualization gives BSOD 0x0000005D
I find that, when trying to run windows 8 on Xen cloud (and also when running it in ESXi), the installer bluescreens with
0x0000005D (UNSUPPORTED PROCESSOR)
Initially I thought it was giving the VM ...
0
votes
1answer
144 views
Is there a way to make virt-manager and xe to work at the same time?
I followed instructions from this site: http://wiki.xen.org/wiki/XCP_toolstack_on_a_Debian-based_distribution. The gist of it is basically to do an apt-get install xcp-xapi xcp-xe.
If I follow the ...
0
votes
1answer
129 views
Is it possible to limit traffic received by a xen domU?
I have ubuntu 12.04 and openvswitch and xen installed, and I know that limit traffic sent by xen domU can be using rate limit by xen netback or "ingress_policing" by openvswitch.
but because ...
2
votes
0answers
130 views
Xen and Turbo Boost
Running the Debian Squeeze default Xen, I am unable to get any of the CPU frequency scaling stuff going.
As soon as I revert to the standard kernel I get it.
Digging through the internet it seems ...
0
votes
0answers
94 views
How to set public Ip to a gentoo xen server behind router
I would like to know if there's a way to set my 4 public ips provided by my ISP to my virtual xen server using bridged lan connections.
My net layout is as follows:
Internet Connection - (Public IPs ...
5
votes
7answers
1k views
Secondary IP (eth0:0) acts like main server IP
I have a CentOS server, configured with 4 consecutive IPs:
eth0 5.x.x.251
eth0:0 5.x.x.252
eth0:1 5.x.x.253
eth0:2 5.x.x.254
The problem is that all traffic goes out to the internet with eth0:0 ...
4
votes
2answers
2k views
Debian/OVH: How to configure multiple Failover IP on the same Xen (Debian) Virtual Machine?
I have a problem on a Xen virtual machine (running latest Debian), when I try to configure a second failover IP address. OVH reports that my IP is misconfigured and they complaint they receive a ...
2
votes
2answers
127 views
Xenserver: One VM crashed, xe not reacting any more
We are running a xenserver. One VM crashed, the other VMs seem to run normally.
But now we can not restart this VM any more.
Not even xe-toolstack-restart is showing any reaction any more.
We do ...
0
votes
1answer
214 views
Ubuntu kernel trace - troubleshooting “task hung for 120 secs” random crashes
I was finally able to get a trace from a 'task hung for 120 seconds' error.
Our servers would just randomly crash on load spikes. IO wait times seem normal. Memory/Swap is fine.
These are Xen based ...
0
votes
0answers
394 views
XEN Domain crash - kernel panic
I have a server with CentOS 5.8.Final, running the 2.6.18-308.4.1.el5xen kernel. I installed the Virtualizorpanel 2 months ago and my VPS are OK, but yesterday one of my VPS crashed. I changed theRAM ...
1
vote
1answer
456 views
Share IP from Xen (XCP) Dom0 to DomU
The situation:
Xen Cloud Platform installed on a dedicated server.
It is assigned a batch of IPs.
I want to create a CentOS 6 VM (domU) that is running a WHM/Cpanel install, and has access to the ...
4
votes
1answer
68 views
How does a VM hosted on xen knows that it is in a virtualized environment [closed]
I have read that in para virtualization hosted virtual machines are aware that they are being virtualized, and this allows them to increase their performance. But, how does the hosted machine know ...
3
votes
2answers
177 views
Can any one clarify this on xen cloud platform/xen server
As per XCP documentation, Xen Cloud Platform host is a 64 bit x86 server-class machine devoted to hosting multiple VMs.
on blog.citrix.com they are mentioning about dom0 as It should be noted that ...
0
votes
1answer
211 views
Windows Server 2008 R2 Standard to Enterprise Problems
A few months ago I setup a Citrix XenApp cluster running on Windows Server 2008 R2 Standard Edition using the temporary 180 day license key.
Recently the company bought a Windows Server 2008 R2 ...
2
votes
2answers
746 views
Can fragmented MySQL innodb tables cause I/O issues? “task hung for 120 seconds” crashes?
Large innodb databases with load spikes seem to be causing random crashes with "task hung for 120 seconds" in the console. There are no logs being written to the system during these crashes.
The ...
-1
votes
2answers
5k views
How to decide between Xen or KVM? [closed]
I am going to set up a high availability hosting server (load balancer, mysql, apache, php, memcached, apc, possibly a distributed/network file system of some kind) with two nodes. I want to isolate ...
1
vote
0answers
98 views
XEN - (magic) networking issue
I have a very strange situation and do not know where to look. I have a XEN installed on Ubuntu 12.04 LTS. My hosting-provider does require, that every new IP my server uses has an own MAC-address. ...
1
vote
1answer
79 views
Xen DomUs with private IPs
I have a server with a public IP in eth0 and routed network config.
I have created DomUs with private IPs (10.0.1.x) and they can ping Dom0 and other private IPs, however I want them to ping the ...
0
votes
1answer
132 views
can xen server be configured to address more than 4 GB for host machine
Can xen server be configured to address more than 4Gb RAM.
Since its based on a 32 bit kernel,is it possible to address more than 4GB ram.I have heard about PAE can it solve this?
Will changing the ...
5
votes
4answers
242 views
Virtualization for hardware resiliency?
Can anyone tell me if it is possible to pool several physical servers to run a resilient virtualization environment. Our servers are getting more and more critical to our clients and we want to do ...
2
votes
2answers
151 views
Why do KVM needs Hardware Assisted support to install even Linux based OS
For XEN we dont need Hardware Assisted support for running linux os.
But why do we need that for KVM for running even linux based os.
Can Kvm be configured to support para virtualization.
Edit:
...
2
votes
2answers
240 views
Randomly crashing Ubuntu 10.04 on multiple Xen VPS host instances
So we have Ubuntu 10.04 running - all 64 bit.
Kernel 2.6.36 and 2.6.38-15 are having the same issues.
Problem is random VPS servers are hanging. We have about 30 instances with this particular ...
1
vote
1answer
405 views
Ubuntu 12.04 LTS + Xen : Ubuntu runs as dom0?
Considering the 'news' that XCP is now officially supported in Ubuntu 12.04, how is it exactly supported? Does Ubuntu 12.04 now run 'officially' in dom0? Or does it run as a VM?
Also, if running ...
1
vote
0answers
158 views
Busy Debian server (Xen guest) seems to go to sleep (energy saving mode)
I have a Debian 6 Xen guest that seems to go to sleep from time to time. Randomly, it just stops to answer to any network requests (HTTP, ssh, ping) and only resumes activity when we log on the ...
0
votes
0answers
59 views
XCP: Best installation option performance-wise
I am considering replacing my current monolithic Ubuntu 12.04 Server with a Xen setup with several virtual servers.
I see there's even an XCP package in the resspository nowadays - is there any ...
0
votes
2answers
176 views
Creating tmpfs file system in xen server to store VM
i want to create a tmpfs file system for one of my vm to run on,using XEN Server.
On the host machine i tried this but is not working,.
xe sr-create device-config:device=/dev/shm name-label="RAM" ...
1
vote
1answer
256 views
free -m is showing total of 309 Mb for a system with 4GB RAM
OS:Xen Cloud Platform 1.1 (XCP) modified centos, and xen server 5.0 running on intel i5
free -m
total used free shared buffers cached
Mem: 309 ...
0
votes
0answers
48 views
Mounting shared memory in XCP/ XEN Server,for storing VM [duplicate]
Possible Duplicate:
Mounting shared memory in XCP/ XEN Server,for storing VM
Requirement
vm with 2HDD
OS will be installed on hdd 1 and required data on HDD 2
I want all my VM ...
1
vote
0answers
132 views
Mounting shared memory in XCP/ XEN Server,for storing VM
Requirement
vm with 2HDD each 1gb
OS will be installed on hdd 1 and required data on HDD 2
I want all my VM running on Xen Cloud Platform XCP 1.1 to use /dev/shm of host machine for HDD1.
Is ...
0
votes
1answer
114 views
Xen make: you must install 'guilt' on your build machine
While trying to build Xen on my Ubuntu 12.04 Server system I see the following:
package/xenclient/gcc/gcc.mk:30: warning: overriding commands for target `/home/hash/device/xen/dl/gcc-4.2.4.tar.bz2'
...
0
votes
2answers
178 views
how to protect xen server free when accessed through browser?
we are having xen server free running on a remote machine,which is having a public ip,through which i am access the console...
When accessed through browser its showing a page to download xen ...
0
votes
1answer
136 views
XCP-XAPI on public server
How can i solve this?
i am having a XCP_XAPI on a public server.But when accessed through browser its showing "Developer XenAPI viewer" .
how can i hide this page from appearing or allow access from ...
0
votes
0answers
126 views
Xen “mixed networking” Debian Dom0 howto?
I have a Debian Squeeze Dom0 with two DomU's already configured using the xen network bridge scripts (with public ip's) works fine.
I now want to setup "eth1" on both DomU's in routed mode with ...
