Summer storm: The launch of Apple’s MobileMe service proved two things: cloud computing is very appealing to consumers, and it’s very hard to get right.
MobileMe
MobileMe is facing problems endemic to cloud computing.
The logo for MobileMe, Apple's upgrade to its .Mac suite of Web applications, comprises the icons of four of the service's major features--e-mail, calendar, address book, and photo gallery--floating in a cottony white cumulus. The image announces an elegant, user-friendly take on cloud computing, syncing users' data wirelessly between Macs and PCs, the Web, iPhones, and iPod touches.
MobileMe has garnered positive reviews for its features and its intuitive user interface. But accessing Apple's cloud has been a stormy experience for some users. The service's debut on July 10 was marred by delays and missing features. Apple apologized for the launch troubles, but since then some users have altogether lost access to their e-mail.
The company also backed off from using the term "push"--which implies near-instantaneous synchronization between devices--in describing the service. While MobileMe does push changes made on the Web or an iPhone or iPod touch, changes made from a Mac or PC can take up to 15 minutes to propagate.
Apple was contacted for this article but was unavailable for comment.
Cloud computing has been touted as a potential tool for everything from improving business infrastructure to helping consumers keep tabs on their contacts. Storing data in the "cloud" of the Internet rather than locally allows users to access that information anywhere and at any time.
Some cloud-computing applications--like Google's Gmail, Google Calendar, and the Google Docs document-sharing and -editing service--live entirely in the cloud: users' data is stored remotely and accessed via a Web browser. Other applications--like the contact-syncing service Plaxo--use the cloud to back up data and keep it up to date across multiple computers and mobile devices.
MobileMe combines both approaches, syncing data between computers while providing access to a user's e-mail, contacts, calendar, and photos via the Web. But the service's troubles illustrate an obstacle to the mass acceptance of cloud computing: the average user has a low tolerance for downtime.
"Availability is essential in cloud computing," says Thomas Vander Wal, founder of the IT consultancy InfoCloud Solutions. "If constant access to information and objects is a requirement, then cloud computing may not be a viable option without alternate solutions." The problem is not limited to Apple. Vander Wal notes that a July 20 outage on Amazon's Simple Storage Service (S3) affected a host of Web-based applications that use it to store data online.
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Voltage is the difference of electrical potential between two points of an electrical or electronic circuit, expressed in volts. It measures the potential energy of an electric field to cause an electric current in an electrical conductor.
Most measurement devices can measure voltage. Two common voltage measurements are direct current (DC) and alternating current (AC).
Learn the fundamentals of creating an AC or DC voltage measurement system. See how to properly connect the signals to your data acquisition system for accurate acquisition.
This document is part of the How-To Guide for Most Common Measurements centralized resource portal.
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