RSS

Fixed: “The security database on the server does not have a computer account for this workstation trust relationship”

I have been playing with my own little AD domain sandbox in hyper-V and came across this error when trying to logon to a domain member server using an account with Domain Admin rights:

“The security database on the server does not have a computer account for this workstation trust relationship”

This is strange because my setup is not very complicated, just one forest DC, one domain DC and a member server. Of course, the first thing I tried is to reset the computer account and also to rejoin the server to the domain, which didn’t work Read the rest of this entry »

 
Leave a comment

Posted by on July 20, 2016 in Windows

 

Tags:

ESXi host performance issues and the importance of thermal paste

A totally interesting read on how the team in VMware resolved an issue with a non performing HP blade. The final take away from this is:

  • Thermal paste really can impact performance!
  • HP Active Health System logs should (but don’t) include when CPU’s clock down to prevent overheating.
  • CPU clock throttled error message don’t appear in ESXi logs.

http://www.vmspot.com/esxi-host-performance-issues-and-the-importance-of-thermal-paste/

 

 
Leave a comment

Posted by on July 1, 2016 in Operations, vmware, Windows

 

Tags: ,

Unswapping swapped mem in Vsphere 6.0

An interesting article from yellow bricks on an undocumented feature in Vsphere 6.0 to allow you to swap out memory after contention is long gone. Previously, you either had to power cycle or vmotion your VM to get back memory into RAM.

http://www.yellow-bricks.com/2016/06/02/memory-pages-swapped-can-unswap/

However, my advice is always to avoid over-commit of memory as the last resort and manage the size your VM to avoid over-commit whenever possible. Ballooning and memory swapping into disk is one of the most performance hit activities that can happen to your environment compared or over-committing on CPU.

 

 

 
Leave a comment

Posted by on June 3, 2016 in vmware

 

Tags: ,

VMware: Goodbye to the fat client

For the longest time VMware administrators have been using the C# VSphere clients or “fat client”. Over the years, it continues to plague us with hidden confirmation dialog boxes, error dialog boxes that pop-up continuously, version incompatibilities on the same computer and application crashes.

Worst of all are the need to test, package and supply new versions of the client whenever the infrastructure is upgrade. Its not a big deal if the only persons to use it are your own VMware administrators. But in big organisation with VDI in the mix, you need to hand off new versions to desktop support and even end users themselves. Worst of all, is the need for a clean uninstall of the older versions before the new versions can be installed or else you may end up with knackered computer which won’t run either versions. Read the rest of this entry »

 
Leave a comment

Posted by on May 20, 2016 in vmware

 

Tags: ,

vCenter Server Appliance 6.0 with vPostgres

Good news to some folks is that vCenter Server Appliance 6.0 is now on par with its former enterprise siblings, namely, vCenter on Windows + SQL or vCSA with Oracle.

For big enterprises, it is very common to install vCenter into a Windows machine and setting up the databases with your DBA admins on SQL. One of the main problem with this is the process of getting a database or expanding databases when you run of out of space. It can take time to setup a new vCenter or you often end up expanding the databases with an incident ticket. The other problem is that because the SQL database is managed by the DBA team, you are dependent on that team’s effectiveness to keep your vCenter running. There are times within busy periods of a DBA teams where you might find the vCenter service stopping or failing due to a stuck job or running out of space on SQL but your team was not alerted in time causing an incident.

Thus running your own vCSA, if you have a big enough cloud team, is probably a better solution in keep the lights up for your vCenter server, especially if they are consumed by VDI/Desktop teams and workflow applications like Orchestrator.

Of course, the challenge for Windows folks like me is having to master a new Linux OS and vPostgres database for optimization and troubleshooting. But these are alwasy good challenges to have.

http://blogs.vmware.com/vsphere/2016/03/getting-comfortable-with-vpostgres-and-the-vcenter-server-appliance-part-1.html

 
Leave a comment

Posted by on March 23, 2016 in vmware

 

Tags: , ,

VMware: Finally a better maintenance mode sequence

I guess most of us have had the experience of getting an ESXi host into maintenance mode and finding that it got stuck with one last VM. When you look into host, you also see shutdown VMs and templates still hosted by this ESXi and you have to manually move them out before trying to get that last VM fixed so that you can get into the maintenance mode.

Great news with the vSphere 6.0 Update 2, now the order of evacuation for host going into maintenance mode is improved! Specifically:

Starting with vSphere 6.0 Update 2, when a host enters Maintenance Mode the host will evacuate all the powered off VMs and templates first, and then proceed to vMotion all the powered on VMs.

http://blogs.vmware.com/vsphere/2016/03/maintenance-mode-improvements-in-vsphere60u2.html

 
Leave a comment

Posted by on March 18, 2016 in vmware

 

Tags: ,

Type cover stopped working in Surface Pro 3

I love my Surface pro 3 and had been using it these past 1 year or so. Recently, for apparently, no reasons my type cover doesn’t work anymore. What I mean is that I was using it just hours before and opened my device and found that the keyboard no longer worked.

Of course, being the troubleshooter that I am, I did the following to determine the problem:

  • Cleaned all the lead contacts of the type cover and the device
  • Rebooted surface like a few times
  • Checked device manager for failed device or try to reinstall it (as found in forums)

Non of these worked for me. So I headed down to the nearest computer shop and asked the kind shop assistant to allow me to test my surface and promised that I will buy a type cover if indeed it was dead. I plugged my type cover to a the display surface pro 3 and it came back to life immediately! Connected my surface pro 3 to the shop’s type cover and nothing happened. Read the rest of this entry »

 
1 Comment

Posted by on February 5, 2016 in General

 
 
Follow

Get every new post delivered to your Inbox.