Direct Attach Storage (DAS)

Introduction:

DAS is a type of storage that is connected directly to the server which enables quick access to the data but only through the server.

Direct-attached storage (DAS) is a basic level storage in which the host computer holds the storage devices or these can be connected to one server at a time. Networked workstations can access the data only through the host. DAS was the first storage model that gained widespread acceptance and is widely used. Even though networked storage models are gaining popularity, DAS still finds takers because it is easy to deploy and has a low initial cost of deployment. It helps if you have an idea of what your data availability needs are at present and what they will be in the future.

Storage System:

DAS is the most basic storage subsystem that provides block-level storage, and it’s the building block for SAN and NAS. The performance of a SAN or NAS is ultimately dictated by the performance of the underlying DAS, and DAS will always offer the highest performance levels because it’s directly connected to the host computer’s storage interface. DAS is limited to a particular host and can’t be used by any other computer unless it’s presented to other computers over a specialized network called a SAN or a data network as a NAS server.

There are the three basic types of storage.

• Direct Attached Storage (DAS),
• Storage Area Network (SAN),
• Network Attached Storage (NAS)

DAS is the basic building block in a storage system, and it can be employed directly or indirectly when used inside SAN and NAS systems. NAS is the highest layer of storage and can be built on top of a SAN or DAS storage system. SAN is somewhere between a DAS and a NAS.

SCSI — Small computer system interface is one of the oldest forms of storage interfaces traditionally used in server or workstation class computers.

PATA — Parallel advanced technology attachment (originally called ATA and sometimes known as IDE or ATAPI) was the most dominant desktop computer storage interface from the late 1980s until recently, when the SATA interface took over.

SATA — Serial advanced technology attachment is the official successor to PATA. So far, there have been two basic versions of SATA, with SATA-150 and SATA-300.

SAS — Serial Attached SCSI is the latest storage interface that’s gaining dominance in the server and storage market. SAS can be seen as a merged SCSI and SATA interface, since it still uses SCSI commands yet it is pin-compatible with SATA.

FC — Fibre channel is both a direct connect storage interface used on hard drives and a SAN technology. FC offers speeds of 100, 200, and 400 MB/s.

Flash — Flash memory isn’t a storage interface, but it is used for very high-end storage applications because it doesn’t have the mechanical latency issues of hard drives.

RAM — Random access memory is also not traditionally seen as a storage medium, but it can be used as an ultra-fast storage device.

API:

Working:

BackUp Solution:

Data De-Duplication

Continuous Data Protection

Tape Drives

Tape Libraries

Disk to Disk

Storage Management Solutions

Benefits:

• The key difference between Direct Attached Storage (DAS) and NAS is that DAS is simply an extension to an existing server and is not networked while NAS sits on a network as its own entity; it is easier to share files with NAS.
• Availability of data might potentially be increased . if it provides built-in RAID & Clustering capabilities.

Limitations:

• Not suitable for data intensive applications.
• Low data transfer rate.
• Limited scalability.
• Highly initial cost.

Applications:

1.File/Print server

2.Application specific server

3.Video Imaging

4.Graphical image store

5.Centralized file sharing

6.File system mirroring

7.Snap shot critical data

8.Replacement of traditional backup methods

Awadhesh Kumar

Jain Software Developers

Microsoft Windows Surface

What is MS Surface. ?

• A surface computing platform from Microsoft.
• Project began in 2001 Introduced in 2007.
• Combination of software & hardware.
• We can also call it table top.

“Microsoft Surface represents a fundamental change in the way we interact with digital content. With Surface, we can actually grab data with our hands, and move it 360o, information between objects with natural gestures and touch. Surface features a 30-inch tabletop display whose unique abilities allow for several people to work independently or simultaneously. All without using a mouse or a keyboard.”

API of MS Surface:

The Surface Experience:

There are many features of windows surface some of the specials features ,i am showing here-

Direct Interaction-User can “grab” items with their hands and move data to different location on the hard disk or to removable devices. Easy touch navigation-without the use of a mouse and keyboard.

Object Recognition-Users can place physical objects such as drinks, cell phones, cameras, wines, food,laptops,mp3 players on the table to activate digital responses. And to see contents.

Multi-Touch Friendly-Recognizes several points of contact simultaneously as opposed to average single point of contact touch screens. Gives users the ability to be completing unrelated tasks simultaneously.

Multi-USer-Friendly- It’s design multi-touch capabilities make it a great gathering spot to share data, exchange ideas, and inspire group collaboration.

Internal Specification:

1)Screen: The Surface has an acrylic table top which a diff user makes capable of processing multiple inputs from multiple users. Objects can also be recognized by their shapes or reading.

2) Infrared: Infrared light is projected onto the underside of the diff user. Objects or fingers are visible through the diff user by series of infrared-sensitive cameras which are positioned underneath the surface of the tabletop.

3) CPU: This is similar to a regular desktop. The underlying operating system is a modified version of Microsoft Vista.

4) Projector: The Surface uses the same DLP light engine in many rear-projection tvs.

5) Cameras: 4 infrared cameras place inside the tabletop and that focus on screen and reads user interaction from four side and cover the whole screen.

Technical Specification:

Software platform: Microsoft Surface 1.0

Display + vision input technology: Rear projection DLP

Weight: 198 lbs (90 kg)

Physical dimensions (L x W x H): 42.5 x 27 x 21 in (108 x 68.6 x 53.3 cm)

CPU: Intel Core 2 Duo 2.13 GHz processor

Graphics : – 256 MB

Memory: 2 GB DDR2

Storage (hard drive): 500 GB HDD

Display size: 30 in (76.2 cm) diagonal

Display resolution: 1024 X 768 ` 4:3 aspect ratio

Extensions (ports): video out, audio out, 4 USB ports

Networking: Wi-Fi, Bluetooth, and Ethernet.

Operating system: enhanced windows vista (32-bit)

Price: starting 10,000 us $ (approx 5 lakh in INR)

How Does it works:

Digital Light processing is a technology used in newer Surface devices.

It allows recognition of fingers, hands, and objects that are placed on the screen, enabling vision-based interaction. Sensors in the individual pixels in the display register what is touching the screen.

A step-by-step look at how Pixel Sense works:

* When An object is placed on the display.

* An infrared back light illuminates the object.

* Light reflected back from the object is registered by cameras.

* Values reported from all of the cameras are used to create a picture of what is

on the display.

* The picture is analyzed using image processing techniques creating a

corrected image.

* The corrected sensor image and information about the objects placed on the

display are sent to the PC.

* And then surface system react according to the user requirement.

Awadhesh Kumar

Jain Software Developers

Google Voice Service

Introduction:

GOOGLE Voice is telecommunication service by google.

Google voice service from invitation only to be a available to all Gmail subscribers.

Google voice currently provides free pc `to-phone calling and PC-to voice and video calling.

Background:

1. —Telecommunications service by Google
2. —Launched on March 11, 2009
3. —Formerly Grand Central

• Originally founded in 2005 by Craig Walker and Vincent Paquet
• Acquired by Google on July 2, 2007 for $95 million
• Google team worked on the project secretly after the time of purchase until the launch
• Added many additional features while still keeping the same general services previously provided

Google Voice basics Requirements:

To get started with Google Voice, sign in with your existing or create a new Google Account to get started.
Then, you’ll just need a touch-tone phone, and these requirements on your computer:

1.  Operating system: Windows XP, Vista, Mac, Linux

2.  Web browser:   IE6 & above, Firefox 3 & above, Safari 3 & above, Google Chrome

3. Flash 8 and above required

How it works:

—Google Voice can be used with an existing phone number or a new Google phone number.

Features:

• —With an existing number:

1. Google Voicemail

2. International Calling

3.Notifications

4. Share Voicemail

• —With a Google number:

1.One Number

2.Free SMS

3.Block Calls

4.Record Calls

5.Conference Calls

6.Screen Callers

Benefits:  there are lots of benefits provided by that features-

1.Lowering Cost-

• —Cutting costs of long distance calls—
• —Free calls and SMS in the US and Canada—
• —International calls as low as $0.02 per minute

2.Managerial Benefits-

• —Voicemail transcripts. Reading of voicemail messages online.—
• —Downloading of voicemail.—
• —Call recording and online archiving.—
• Blocking calls from specified numbers.

3.personal Benefits-

• —Answering incoming calls on any configured phone.—
• —Switching of phones during a call.—
• —Conference calling.—
• —Notification of voicemail messages via email or SMS.

Google Voice Applications: there are some voice applications available in market-

—For Blackberry and Android phones

—GV Dialer- routes your call by dialing to your Google number and connecting you to the destination number.

—GV Mobile- dial, retrieve and delete recent call history, playback and delete voicemails take calls from different phones other than your iPhone, forward calls, etc.

—Google Voice Desktop App- quick desktop access to your voicemail and SMS messages.
Setting Google Account: Follow the step by step procedure to setting up google account in your application ask you.

Awadhesh Kumar

Jain Software Developers

Upcoming Latest Android Version- Android 6.0 Marshmallow

I know that everyone using and enjoying Android Lollipop 5.1.2 but today, I introducing about the upcoming latest android version that is Android 6.0 Marshmallow. Its is overcome  the all previous bugs and problems and also provide new key features that is improve the quality and improve the calculations power and speedup the smartphone.

Android Marshmallow release date:

Android Marshmallow was initially announced at Google I/O on May 28, when it was released as the Android M developer preview. Several updates to the preview came out before Marshmallow was officially named on August 17. Google finally unveiled Android 6.0 Marshmallow, alongside the 2015 Nexus devices, on September 29, 2015.

Android Marshmallow Layout and Design:

Home Screen:

Home screen is not more differ from lollipop version, it is same or similar as previous version that appear a google search box (with voice command) but in this version have some new key feature like inside search box have a tag line which is say a user to talk and search.

Lock Screen:

          The Marshmallow lock screen is almost similar to Lollipop’s that is also provide with expandable notifications and app shortcuts. But where Lollipop had shortcuts in the bottom corners that too you to the camera and dialer, Marshmallow replaces the dialer shortcut with one to Google’s voice search.

Marshmallow version have lots of feature and key points to explain but here I explain only two points to describe Latest version. It has some other key features that’s completely differ from old one-

• App Icons,
• Lock screen,
• Animations and Easter Egg
• Dark theme and rotation support and many more.

 Awadhesh Kumar

Jain Software developers