These days a lot of attention is paid to the ecology and green technologies, including manufacturers of servers. Hewlett Packard is not the exception. There are number of parameters in the settings of server's BIOS, which affect the power consumption of hardware. And, naturally, these parameters also affect performance. You may not know this, but these are installed by default settings, significantly reduce the speed of the memory and CPU.

I will show you where these parameters are located. Setting the highest values for these settings helped us to significantly increase the speed of VmWare ESXi hosts and to achieve a shorter response for SAP systems. These recommendations are taken from SAP notes. 

During upgrade of domain controllers or theirs addition\removal in Active Directory domain, there is always a need to change DNS-servers in network interfaces settings in Windows. On those computers or servers where you set network settings with DHCP - there is no problems. But on those where you configure settings manually, you will have to change them manually also. It is long and inconvinient.

Just after clean Debian Jessie Linux installation, you will install SSH Daemon and then you will encounter an issue when you are not able to login via SSH with root account.

$ ssh [email protected]
[email protected]'s password: 
Permission denied, please try again.

Sometimes after correct installation of Veeam Powershell Snapin, attempt to load snap-in into Powershell console ends with error: Add-PSSnapin : The Windows PowerShell snap-in 'VeeamPSSnapIn' is not installed.

This problem occures because for some reason Snap-in is not got registered in Powershell. On Veeam official forums they offer many solutions like reinstalling Veeam or reboots-reinstalls of the Powershell module. In my case the following solution was found:

As you know, Lync have its own address book (AB) that downloaded by clients. By default, the download and update process of address boook in Lync 2010/2013 triggered in first 60 minutes (random time) after program start. In our company this situation was considered as wrong, thus I had to find solution how to ensure guaranteed updating of Lync address book right after the client starts. Also, there are other issues with delta-updating of address book, like a big delays (5-10 days) after changes in Active Directory are repliacted to Lync AB. 

The consequences of such behavior:

Here is SELECT statement to find duplicates in SQL table on certain fields: