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Posts Tagged ‘Troubleshooting Fridays’

XenServer 6.0 – Import/Export OVF

We had received several OVF from a vendor who exported their VM’s from VMWare and we needed to import them into our XenServer 6.0 environment. After learning that this functionality is now built into Citrix XenServer and no longer needing XenConverter we were excited. However our initial test to import failed. After re-reading the documentation and searching several forums, nothing appeared to resolve the problem – the import would start and several seconds later it would fail.

So we imported the images into our VMWare environment to ensure the OVF’s were good, and even exported them again just to make sure the OVF files themselves were not the issue.

We then tried to export a XenServer VM via OVF and it failed as well. However we could import and export VXA files without issues. Okay, so we have it narrowed down. A bit more research brought us to this Citrix Blog about TransferVM

http://blogs.citrix.com/2010/12/09/diagnosing-xenserver-appliance-wizard-failures/

We attempted this but it said that the package as already installed.

We then contact Citrix who said to try: Nagivating to /opt/xensource/packages/files/transfer-vm and then running the uninstall-transfer-vm.sh

However that didn’t work, it prompted for a UUID but it didn’t document anything about the UUID

We brought this back to our test environment and it worked fine, we uninstalled and then installed and our OVF imports work properly. The difference between the test environment and production is that production is in a pool, whereas the test is standalone.

I have tried to find documentation on which UUID it is looking for but at this point I’ve tried it with the pool, host, and sr UUIDs to no avail. I might have to resort to cycling hosts out of the pool into standalone mode and reinstalling the transfer-vm component and then rejoining the pool.

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SBS RWW ActiveX Control Error

A problem discovered by another technician for a client which  points to a possible problem with clients which use RWW to connect to their desktop computer at the office who are running Windows XP SP-3 with IE8 installed. The symptom is that when they click to see a list of computers that they can connect to, they see:

“This portion of the Remote Web Workplace requires the Microsoft
Remote Desktop ActiveX Control. Your browser’s security settings may
be preventing you from downloading ActiveX controls. Adjust these
settings and try to connect again.”

Be sure to check the following:

  • IE Compatibility Mode is enabled for the RWW site
  • The site is on the “trusted site” list
  • From the command line, type “regsvr32 mstscax.dll” to re-register the control

XenServer Virtual Disks

Unlike VMWare (ESX/ESXi), Citrix’ XenServer presents virtual hard drives over an IDE interface which is limited to 4 devices (two primary, and two slave devices), and since you also have an optical media (DVD) present, then you are limited to only 3 physical drives presented to your virtual host within Xen.

However, according to the documentation, the maximum number of disks which can be added to a Microsoft Windows VM is 7 physical drives. However, without reading the details on how to accomplish this, you will find that you can actually only add 3 physical drives from XenCenter.

To increase this, you will need to first boot the Virtual Server and install the Xen Tools, and reboot so that XenCenter detects the correct toolset is installed. At this point you will be permitted to add a second set of 4 physical drives, which will be available within Disk Management immediately. Of course you will need to go through the customary partitioning and formatting of the virtual drive.

You need to be aware of this issue as booting a migrated system without all the necessary drives attached MAY cause issues.  In some cases it COULD even prevent the server from booting.

Microsoft SBS – RWW on XP SP-3 with IE8 Installed

Wow, what a short title full of abbreviations! A problem discovered by another technician points to a possible problem with clients which use RWW to connect to their desktop computer at the office who are running Windows XP SP-3 with IE8 installed. The symptom is that when they click to see a list of computers that they can connect to, they see: 

This portion of the Remote Web Workplace requires the Microsoft Remote Desktop ActiveX Control. Your browser’s security settings may be preventing you from downloading ActiveX controls. Adjust these settings and try to connect again.
 

Be sure to check the following: 

  • IE Compatibility Mode is enabled for the RWW site
  • The site is on the “trusted site” list

 

mstscax.dll” to re-register the controlregsvr32From the command line, type ”

 

 

Equallogic iSCSI Connectivity with Dell Switches

Whe using a Dell Power Connect switch to access an Equallogic SAN with iSCSI, here are some quick tips:

  1. You must use the most recent version of the firmware. The older firmware had a flow control problem which could create major performance issues. If you have a Dell Switch and an iSCSI SAN please insure the firmware is on the most recent version.
  2. As with all iSCSI you’ll get the best performance by using Flow Control and Jumbo Frames, flow control being by far the most important (Flow control is required while jumbo frames are recommended).
  3. On the Dell switches with an EqualLogic SAN they recommend turning off the iSCSI optimization.

 

 

Blackberry Enterprise Server, error 0x8004011d

When launching the BES manager, you must be doing so from the BESAdmin user account, and not from any domain administrator account, otherwise you will receive an error about connecting to MAPI. If you see this error, back out and make sure you’re logged on as the BESAdmin (which is a local and domain user, non-admin). This is a “feature” of how Microsoft Exchange 2003/2007 operates, and is not a Blackberry ‘bug’….  You will also see the following error in the application event log: Failed to open default message store, result=0x8004011d

Happy troubleshooting