The Ubuntu Mainframe Cookbook
If you liked the Virtualization Cookbooks for Red Hat and SUSE and you are looking at Ubuntu right now then maybe you are interested in Mike MacIsaac’s latest book: The Ubuntu Mainframe Cookbook.
If you liked the Virtualization Cookbooks for Red Hat and SUSE and you are looking at Ubuntu right now then maybe you are interested in Mike MacIsaac’s latest book: The Ubuntu Mainframe Cookbook.
This YouTube video from Paul DiMarzio shows an interesting analytic example from the Hack Spark contest. Thanks Paul for creating this!
After the IBM statement of directions to support KVM on System z I’ve been asked many times for a criteria if a certain ISV software or customer solution needs to be retested or not. As in performance the answer is: … Read the rest
When running in a virtualized environment like z/VM it’s beneficial if the hypervisor knows if a server is idle or not. Usually this is implemented by waiting a certain time before considering a server truly idle. The problem is that … Read the rest
Today IBM announced a preview of z/VM 6.3. The two top improvements are:
At SHARE there have been two presentations with more technical details in it:
40 years ago IBM introduced VM/370 the first virtualization layer. My first really brief encounter was at the end of the 80ies, when I did some RPG programming work. But I learned the real value of it a decade later, … Read the rest
DB2 Connect servers are usually a good target for consolidation. Recently we observed relatively high CPU utilization even though only a small workload was being used. The oprofile and strace output showed that the system was busy doing semget() calls … Read the rest
Ever wondered why your Java application is not running as smooth as it should in a virtualized environment? There are multiple reasons for this and so Steve Wehr gives some explanation for this in this new whitepaper. This isn’t … Read the rest
The virtualization cookbook from Michael MacIsaac, Brad Hinson, Marian Gasparovic received a major updates to cover z/VM 6.2 (including singe system image), RHEL 6.2 and the upcoming SLES11 SP2. All is now in one book and it’s even got a … Read the rest
When a process in Linux has issued an IO and is waiting for a response there are basically two different possibilities. The good case is that there is other work pending and the CPU can continue to work. If there … Read the rest