Thought stream

Standard RAID levels comprise of configurations that employ the techniques of * STRIPING * MIRRORING * PARITY  to create large reliable data stores using general purpose HDDs. Levels are standardized by SNIA (Storage Networking Industry Association) in Common RAID Disk Drive Format (DDF) RAID 0 >> STRIPING (No fail-over, No Redundancy, Total loss of information if disk fails, each disk size will be of smallest disk size in the set of the disks) RAID 1 and its variants >> MIRRORING (Copy of write will be in more than one disk, Redundancy, less performant) RAID 5 >> Distributed PARITY RAID 6 >> Dual PARITY Source:   Wikipedia

Points to keep in mind: 1. Computers that belong to a subnet are addressed with an identical most-sig bit group in the IP addresses 2. IP is logically divided into NetworkIdentifier/Routingprefix and Restfield/HostIdentifier 3. Routing prefix can be expressed as CIDR (Classless Inter-Domain Routing) notation. Ex. 198.51.100.0/24 Implies NetworkIdentifier has 24 bits allocated and Rest field has 8 bits allocated 4. A network is characterized by subnet mask or netmask, applied by bitwise AND operation Ex. For 198.51.100.0/24, the subnet mask is 255.255.255.0 Subnet masks are used to identify the networks *If 198.51.100.0 is NetworkIdentifier, then 198.51.100.255 is BroadcastIdentifier For Class A, mask is 255.0.0.0; Class B, mask is 255.255.0.0; Class C, mask is 255.255.255.0 5. Traffic is exchanged between subnets through routers, when the routing prefixes of the source and destination addresses differ; A router serves as a logical boundary between the subnets. Advantag...

Source: Sadguru, Isha Foundation

Source: Sadguru, Isha Foundation

With the internet everywhere, content aggregators, broadcasters, and content producers are compelled to find new delivery channels. SMART TV happens to be the next trend riding the wave. Ofcourse, we need to see how SMART TV concept catches up in India as there is cost barrier.  SMART TVs are finding their ways in west, however, it remains to be seen whether they can double up as an effective delivery medium. In my view, the major concern is that, the user still has to switch to TV application from main screen to access. As a viewer, I don't find it convenient to navigate, every time I need to access TV app, rather I user my tablet to access app. I wished, TV applications being displayed alongside main screen, more as a companion one and had access to the context of the content being broadcast. This is the tricky place to be in and I am not sure, it is going to be reality because of content protection policies. However, one thing is for sure, the broadcasters are sitting on...

Object orientation is all about modeling the real world information mainly through encapsulation, abstraction, polymorphism, containment, inheritance and so on. In simple words, an object contains the data structures and methods to change the content state. A typical OO run-time manages the life cycle of objects. You can create as many objects as required as long as the run-time does not over run its memory. Service orientation requires you to encapsulate a process. The operations of a services are interaction points with the particular process. Data structures are the arguments for these operations. Service run-time shall validate the correctness of the process. Service can have multiple invocation instances, not multiple instances of service itself. Example: TrainTicketBookingService involves a process. - Check the train timings //  interaction point - Check the seat availability // interaction point - Issue ticket // interaction point There could be many ticket...

SOA, Yes, it expands to Service oriented architecture. What is it? Keep these things in mind during design and analysis. 1. Whenever you design a service, you are designing a service for a business task. 2. These services can be linked to achieve bigger business goals. Let us understand 'Service': In my view, a service is an expectation fulfillment for a service consumer, without service consumer actually worrying about how is it fulfilled. For example: A student opts of 'Data structures' lesson. The delivery of a lesson is a service for the student. The professor does his homework, examples and makes sure that student understands the lesson. Student and the professor are the different entities, yet there is a well defined service contract between them which enabled two entities exchange the expectation without student actually worrying about the service implementation aspects of the professor. So, to be called a service, it should be meaningful. It ...