I created and uploaded this video to youtube back in 2009. This video demonstates how to solve a simple algebra coin problem. Continue reading
Algebra: Linear Equations (Coin Problem) [Video]
Posted in Algebra, Math
Tagged algebra, algebra coin problem, coin, coin problem, math
Leave a comment
Chemistry: Calculate the Mass of an Atom [Video]
I created and uploaded this video to youtube back in 2009. This video demonstrates how to solve a simple chemistry problem. I calculate the mass of a Chlorine atom. Continue reading
Python – Implementing Caching in Your Applications via Dictionaries
In this blog I demonstrate how you can implement and take advantage of caching in your Python scripts/applications.
Caching allows you to complete tasks more rapidly by storing and reusing results for repeated operations using the same criteria. For example, consider a function that takes several arguments and performs a complex calculation. What if you passed the same arguments to this function ten times; well, without caching, the same operation and complex calculation will be performed ten times. Continue reading
Posted in Chemistry, Programming Languages, Python, Science, Technology, Tips & Tricks
Tagged amu, atomic mass, atomic mass unit, atomic masses, cache, caching, caching scheme, chemistry, compound, dictionaries, dictionary, dictionary cache, element, formula mass, h2o, mass, molecular mass, molecule, Python, python dictionary, python dictionary cache, water
Leave a comment
Coding a XenServer Client in Python – Monitoring Multiple VMs via Multiple Threads
HueXenClient - XenServer client written in Python using the Citrix XenAPI
Posted in Networking, Programming Languages, Protocols, Python, Technology, Virtualization and Cloud Computing
Tagged Citrix, Citrix Xen, Citrix Xen API, Citrix XenAPI, Citrix XenServer, HueXenClient, ICMP, ICMP packets, Network Monitoring, ping, PMW, port, ports, PyDev, PyDev plug-in, Python, Python megawidgets, Python megawidgets library, python pmw, thread, threads, Tkinter, Tkinter GUI library, VM Monitoring, VM Network Monitoring, Xen, XenAP, XenCenter, XenClient, XenServer, XenServer 6.0, XenServer pool
Leave a comment
EIGRP – Best Path Selection
By default EIGRP uses bandwidth and delay of the line to determine the best path to a remote network. However, if desired, EIGRP can use a composite of four metrics: bandwidth, delay, reliability, and load. Maximum transmission unit (MTU) is not used in EIGRP calculations but is a required parameter in some EIGRP-related commands. Also, by default, EIGRP will provide equal-cost load balancing across up to four links. You can disable load balancing by setting the ‘maximum-paths’ to ’1′. In this lab I use four Cisco 3725 routers [IOS 12.4(15)T10] to demonstrate EIGRP path selection behavior on Cisco routers. Continue reading
Posted in Cisco, Labs, Networking, Protocols
Tagged bandwidth, Cisco, Cisco 3725, Cisco 3725 router, Cisco 3725 routers, delay, delay of the line, EIGRP, EIGRP calculation, eigrp load balancing, Enhanced Interior Gateway Routing Protocol, equal cost load balancing, load balancing, router, routing table, topology table
Leave a comment
Setting-up Basic iBGP and eBGP on Cisco Routers
The Border Gateway Protocol (BGP) is a protocol used to make core routing decisions on the Internet. BGP is commonly mislabeled or referred to as an IP routing protocol. However, it is not a routing protocol; rather, it is a TCP application that carries routing information with it. It is better referred to as a reach-ability protocol rather than a routing protocol. Continue reading
Posted in Cisco, Networking, Protocols, Technology
Tagged AS, Autonomous Number, Autonomous Numbers, BGP, BGP table, Border Gateway Protocol, Cisco, Cisco 3725, Cisco 3725 router, eBGP, established, established state, External BGP, iBGP, Internal BGP, Multihomed, neighbor, neighbor relationship, Neighbors, ping, prefxes, redistribute connected, redistribute static, redistribution of static and connected routes into BGP, show ip bgp, show ip bgp summary, state
Leave a comment
Single/Dual and Multihomed Connections
Network engineers will sometimes speak of connections to their ISP(s) in terms of single homed, dual homed, single multihomed, and dual multihomed. Here is a breakdown and clarification of what this terminology means:
– Single Homed (1 link per ISP, 1 ISP)
– Dual Homed (2+ links per ISP, 1 ISP)
– Single Multihomed (1 link per ISP, 2+ ISPs)
– Dual Multihomed (2+ links per ISP, 2+ ISPs)
Expanding the Java vSphere Client Code Example (HueVIClient 2.0 – Connecting to VMware ESXi)
In a previous blog I demonstrated using the VMware VI (vSphere) Java API with VMware ESXi (see prior blog Using the VI Java API with VMware ESXi). I’ve decided to add to this code to provide further functionality and demonstrate the power of the API. In the prior blog I created a vSphere Client in Java from scratch to connect to VMware ESXi and perform basic management functions. This update adds on and improves the original foundation we have already built. Continue reading
Cloud Computing and the Pace of Technological Innovation
Everyone knows for the most part that technology, especially in Silicon Valley, is a fast moving beast. Nowadays, it’s not a field for people to get into halfheartedly; otherwise, you may find yourself being eatin’ alive by the competition. It’s a land and time where geeks and hardcore tech junkies flourish and those seeking a 9 to 5 job die off. With the speed at which technology is moving, even I, a devout hardcore tech junky whose personal and work life have commingled to a point of no distinction, find it hard to keep up. Continue reading
The Commoditization of the Hypervisor
It’s amazing; since the introduction of hardware based virtualization made possible with processor technology such as the Intel-VT and AMD-V (see prior blog The Power of Virtualization – a competitive edge), everyone and their mother is coming out with a hypervisor. Continue reading
Posted in Business, Technology, Technology, Virtualization and Cloud Computing
Tagged AMD-V, Citrix, commodity, hypervisor, Intel VT, Live Migration, live storage migration, Microsoft, Oracle, oVirt, paravirtualization, Red Hat, Storage VMotion, virtualization, vMotion, vmware, Xen, XenServer
Leave a comment
Twitter
LinkedIn
Youtube
RSS