vCenter error while trying to delete NAS storage

Today I've faced another interesting problem. I've added the NFS storage to the ESXi host, then I've added the same storage to the cluster. After a while I've noticed that one of the hosts had 2 storages attached with different names, but pointing to the same NFS target. When I've tried to delete the wrong one, I've got the foloowing error: "The object has already been deleted or has not been completely created". To make the things even more complicated, the virtual machines that were vMotion'ed to that ESXi host in a cluster, somehow changed their datastores to the wrong one (like background Storage vMotion). Thanks God that was testing environment :).

However the solution is very simple:
Just restart the management agents on the ESXi host. This will force the update at the vCenter Server.

Dual-boot Windows XP and Linux Ubuntu time problem

If you are using both Windows and Linux at your PC, then chances are that you will face a problem of time difference between operating systems. To solve this problem:

gksudo gedit /etc/default/rcS

Change UTC=yes to UTC=no

Recovery of lost partitions and files in Ubuntu

There is really nothing to say about it but one word: TestDisk.

Procmon - little handy tool

Recently, I've faced a problem, when wrong GPO from old misconfigured Windows Server 2003 DC applied to newly installed Windows Server 2008. There was a lot of issues related to wrong registry and file system permissions (the only things that doesn't restore to a previous state after removing GPO), so different services, such as Terminal services, couldn't start and produced a lot of errors. The only tool that helped me was Procmon. It allows to see real-time operations of operating system, check all "Access denied" errors and much more. Now everything works just fine.

Troubleshooting packet flow through the ASA

http://www.networkblueprints.com/troubleshooting/cisco-asa-troubleshooting-tool-kit