How to troubleshoot / Useful command around openVswitch in XenServer

This article provides information about ovs and command that can be used to troubleshoot ovs related issues...

Supported NFS protocols and how to identify which protocol is being used

Q. What are the supported version of NFS protocol ? How to identify which being used now ? A. NFSv3 is supported with XenServer 6.1,6.2,6.5 and XenServer version 7 supports NFSv3 and NFSv4.If the underlying storage array does not support NFSv4, NFSv3 will be used to mount the share. In order to...

vhd-util tool to inspect the VHD headers of a VHD

vhd-util is a native utility of a XenServer used to inspect the VHD headers of a VHD. This will be useful to inspect the parent child relationship in VHD files...

Measure storage performance on XenServer using dd ?

dd is a native linux command also available on XenServer that can be used to measure the performance of a block device like /dev/sda at a block level. We can use this command to troubleshoot storage performance issues within the Host as well as the guest while clubbing it with other tools like...

Upgrading to Ubuntu 14.04, RHEL 7 and CentOS 7 Guests

Customers who wish to upgrade existing Linux guests to versions which now operate in HVM mode that is, RHEL7, CentOS 7, and Ubuntu 14.04 should perform an in-guest upgrade. At this point, the upgraded Guest will only run in PV mode - which is not supported and has known issues. Customers should r...

How to confirm the status of HBA inserted into XenServer Host

Inorder for Storage repositories like LVMOBHA to connect properly, first step is to confirm if the HBA are connected properly to the Host. This article will help in confirming that...

Error when trying to disable HA on XenServer

When trying to disable HA for the pool, we are getting the following error xe pool-ha-disableThe uuid you supplied was invalid.type: VDIuuid: 87ca6afc-b0ad-4e54-bb5e-313dddd77ea2...

How to connect to a console of a Linux VM from XenServer Host Console

Sometimes it might be necessary to connect to the console of VM via command line when SSH and XenCenter console is not working. This article describe the process for it...

How to find the disk associated to a VM from XenServer CLI

While troubleshooting storage issues, we might need to get the VM's disk and its associated Virtual block devices . This article will help to get the desired details from the VM...

Generated troubleshooting for NFS related issues on XenServer

This article will give you guidelines for troubleshooting NFS SR related issues on XenServer...

All paths in multipath are not visible in XenServer after a reboot

After a XenServer Host reboot, some of the paths are not visible when typing the command multipath -ll...

Error: "xenopsd internal error: Unix.Unix_error(Unix.ENODEV, "write", "") importing VM on XenServer

After exporting a VM into an xva format and trying to import the VM, VM import is successful, but when trying to start the VM, it fails with the following error in the /var/log/xensource.log xenopsd internal error: Unix.UnixerrorUnix.ENODEV, "write", ""...

How to capture network trace for a XenServer VM while booting up ?

In order to troubleshoot issues related to TFTP or DHCP, we may need to capture network traces during initial VM bootup. As Virtual interface is not loaded during initial bootup phase of VM, we need to capture trace on the tap device...

XenMotion Compatibility Requirements

When migrating a VM with XenMotion or Storage XenMotion, the new VM host must meet the followingcompatibility requirements in order for the migration to proceed: • XenServer Tools must be installed on each VM that you wish to migrate. • The target host must have the same or a more recent version ...

How to take a XenServer toolstack (XAPI) database dump and view it

XenServer stores the vital information related to objects such asVM, VIF, VDI, PBD in an XMLformat file under /var/xapi/state.db.Thisfile is synced between pool membersat regular intervals to maintain aconsistent view of the XenServer pool. We recommend that you back up this XAPIdatabase file. Th...

Capturing a continuous network trace( tcpdump ) on XenServer without filling the dom0

In certain situation, we are not sure when will the issue be reproduced and need to keep the network capture running. If the capture is run directly, it may fill up the dom0 filesystem and can crash the XenServer Host...

Mount cifs and nfs storage from CLI on xenserver

Mount cifs and nfs storage from CLI on xenserver...

How to Capture a Network Trace from a XenServer Physical Interface, Virtual Bridge, and VM Virtual Interface

This article describes how to capture a network trace from a XenServer physical interface, Virtual Bridge, and Virtual Machine Virtual Interface...

Error in handleInterruptedCoalesceLeaf when trying to scan the Storage on XenServer

Error in XenCenter - SR failed to complete the operation Error in /var/log/SMlog -25840 2012-12-14 10:52:35.402274 lock: released /var/lock/sm/lvm-579fdc35-f120-398e-397e-b12179c9531c/83b6fcfd-e9ed-432b-b662-d8d28f9ccca525840 2012-12-14 10:52:35.402380 lock: closed...

How to reset root password of NetScaler SDX

This article describes how to reset the root password of NetScaler SDX running on XenServer. Note: If you are a XenServer user, do not refer to this article. Instead, see the XenServer documentation. Background For the XenServer component of a NetScaler SDX, a lost root password can be overwritte...