38
votes
Accepted
Is it safe to mount the same partition to multiple VMs?
In general, no, unless you meet one of two very specific constraints. Either:
The device needs to be exposed read-only (this MUST be at the device level, not the filesystem level) to all the VMs, and ...
- 2,060
28
votes
Accepted
Is KVM a type 1 or type 2 hypervisor?
KVM is not a clear case as it could be categorized as either one. The KVM kernel module turns Linux kernel into a type 1 bare-metal hypervisor, while the overall system could be categorized to type 2 ...
- 43k
27
votes
xvda1 is 100% full, What is it? how to fix?
I know i am replying in this thread after nearly 5 years but it might help someone,
I had the same problem, i had m4.xlarge instance
df -h told that the /dev/xvda1 was full, - 100%
Filesystem ...
- 425
19
votes
Is it safe to mount the same partition to multiple VMs?
If you don’t run cluster-aware file system inside your VMs you’ll simply destroy your shred volume immediately after first metadata update. Full clarification story is here:
https://forums....
- 12.5k
18
votes
CRITICAL STRUCTURE CORRUPTION on Windows Server 2012 R2
xenpci.sys (EJBPV XenPCI Driver (Checked Build), James Harper)
(Checked Build) is a huge red flag. You absolutely should not be using "checked" builds of anything in production. If your hosting ...
- 55k
15
votes
Multiport Server NIC ports?
These devices are typically seen in the OS as four separate network devices and they can be used just like the four separate NICs you had before.
- 97k
14
votes
Accepted
Is Administering XenServer like administering CentOS?
Keep in mind that the OS is stripped even if based on a release, as if the gear is in the HCL, you will mostly never use any OS command.
Most command you will ever use to administer it would be in ...
- 16.2k
12
votes
Accepted
Meltdown & Spectre - Does patching the guest kernel of an unpatched hypervisor prevent cross-VM memory leaks?
From what I understand of the vulnerabilities, no - the speculative caching attacks bypass all of the CPU's protections against a process grabbing memory from whatever arbitrary address.
I believe ...
- 113k
10
votes
Is Administering XenServer like administering CentOS?
Primarily, you are committing to work in the XenServer way. This product is essentially an appliance and most of the things that are different between Debian and CentOS are hidden from you anyway or ...
- 97k
10
votes
Is KVM a type 1 or type 2 hypervisor?
If Hyper-V is type 1, then KVM is type 1 as well. There are no hardware services being emulated by the operating system in KVM. Frankly, the whole type 1 vs type 2 terminology is obsolete and ...
- 144
7
votes
CRITICAL STRUCTURE CORRUPTION on Windows Server 2012 R2
Xen 3.4.4 is too old. 13 March 2013
Windows 2012 R2 got released on 18 October 2013.
To give you an actual comparison, XenServer from Citrix added Windows Server 2012 R2's support in their version ...
- 16.2k
6
votes
Machine check events logged
mcelog was removed in Debian 10+ (Buster) and Ubuntu 18.04+
The functionality has been replaced by rasdaemon.
- 206
6
votes
Accepted
Handling /etc/fstab when upgrading linode from Xen to KVM
You have no way of predicting what the device names or IDs will be after a significant hardware change (virtual hardware in this case, from Xen to KVM). Linode is the only entity here who knows what's ...
- 5,562
6
votes
Accepted
How can I convert a iSCSI system disk from XenServer to another format
To get disk image do P2V and/or V2V:
attach iSCSI to Windows by ISCSI initialtor.
create VHDX using Disk2vhd (https://technet.microsoft.com/en-us/sysinternals/ee656415.aspx)
convert VHDX to QCOW ...
- 3,878
6
votes
How to combine disks from XEN-hosts into one storage?
There are some storage solutions that operate in a similar way as to VMware vSAN. The ones that got popularity in virtualization sphere are:
Dell EMC Unity: I doubt they support Xen though.
HPE ...
- 8,723
5
votes
Hammered by botnet; iptables can't keep up
You obviously can't keep up with this sort of attacker by hand. If they have that many IP addresses, this won't work.
Have you analyzed what the bots are doing? Are they trying to send spam? Scraping ...
- 236k
5
votes
Accepted
Moving LVM volume group from one physical disk onto another
A volume group can have multiple physical disks (or in your case, partitions).
First you need to have space on your larger disk (/dev/sda).
You did not mention that in your post, but based on your ...
- 4,914
5
votes
Accepted
XenCenter no OS boot parameters field
The first VM is running in PVHVM mode, so QEMU is working with Xen to virtualize the hardware behind the VM. This mode is for OS that does not support Xen paravirtualization in general, like Windows ...
- 5,400
5
votes
Accepted
CentOS 7 on XenServer 6.5
You need to start the installer with inst.vnc option. Select option "Install CentOS 7" and then press [tab]. Remove 'quiet' and add 'inst.vnc' to kernel command line. Press [enter].
After that, wait ...
- 5,147
5
votes
Multiport Server NIC ports?
As others have already mentioned, yes, a 4-port network card will be recognized and usable just like 4 separate network interfaces.
However, in particular with 4-port cards, you should pay attention ...
- 4,103
4
votes
xvda1 is 100% full, What is it? how to fix?
I've recently run into this issue on Amazon Linux. My crontab outbound email queue /var/spool/clientmqueue was 4.5GB.
I solved it by:
Locating large files: sudo find / -type f -size +10M -exec ls -...
- 141
4
votes
xvda1 is 100% full, What is it? how to fix?
I have just solved that problem by running this command:
sudo apt autoremove
and a lot of old packages were removed, freeing up 5 gigabytes, for instance there was many packages like this "linux-...
- 41
4
votes
xvda1 is 100% full, What is it? how to fix?
Paulo was on the right track for me, but when I tried to run
sudo apt autoremove
it responded:
Reading package lists... Error!
E: Write error - write (28: No space left on device)
E: IO Error ...
- 141
4
votes
Can I virtualize multiple hosts into one virtual system?
You actually can now, although it requires InfiniBand which may be out of your price range.
The only one that I know that can do this is ScaleMP (http://www.scalemp.com/)
Basically it makes all the ...
- 141
4
votes
Use SSHFS on XenServer 6.1
Although this is an old question, I have just figured this one out myself.
First.. what DOES NOT WORK (All tested on XenServer 6.5):
xe-import filename=/dev/stdin does not work.. at all. It does ...
- 141
4
votes
How to change boot device on vm installed on Citrix Xen Server to DVD
I had the same issue as B14D3 using the same version of Xenserver and VMs with Centos 6 and 7. I need to resize the file system using gparted, to accomplish that I need to boot from the live dvd.
I ...
4
votes
Ubuntu on VPS becomes unresponsive: BUG: soft lockup - CPU#0 stuck for 22s
Well I couldn't find any solution to this problem whatever I tried. In the end I replaced Ubuntu with Debian 7.0, and the problem went away, along with some anomalous CPU usage which didn't show up in ...
- 220
4
votes
Ubuntu on VPS becomes unresponsive: BUG: soft lockup - CPU#0 stuck for 22s
Hope this helps anyone looking at this problem in the future.
We've experienced this issue in a similar environment:
Ubuntu 14.04 3.13.0 Kernel
QEMU KVM environment
Our Splunk cluster master was ...
4
votes
Accepted
Xen: 'this operation could not be performed' (VDI is in use) error?
(For Xen 6.2) If you have access to XenCenter go to 'view' 'show hidden' and make sure that there isn't a job running for this VM already. If there is, stop and delete it.
This may happen if you ...
- 2,297
4
votes
Remote automated provisioning to a XenServer Hypervisor
For the next guy looking into this:
The solution is to read the XenServer guest installation guide and use a search engine. ;)
First, there's a ansible playbook with nice documentation for setting ...
- 1,441
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