Photos, Science, Technology

Dive to The Deep Seas with Google Earth

Now, we can go to and explore the deep seas (plus ocean floor) with the new update of Google Earth Maps for Oceans. The areas now visible on Google Earth include the huge Hudson Canyon off New York City, the Wini Seamount near Hawaii, and the sharp-edged 10,000-foot-high Mendocino Ridge off the U.S Pacific Coast.

The Kane Fracture Zone
The Kane Fracture Zone cuts across the Mid-Atlantic Ridge. The floor of the fracture is over 5 kilometers deep and the mountain peaks are 1.5 kilometers below the surface. Credit: Lamont-Doherty/GMRT

This time, diving equipment and certificate are unnecessary.

OS, Technology, viewpoint

Chrome OS is Ready for Tablets?

CNET was found hints inside Google’s source code. These signs are told us that company programmers have begun building a tablet version of Chrome OS.

Chrome OS on Tablet

Looks awesome!

blog, Miscellaneous, Technology

[Paper] Availability in Globally Distributed Storage Systems

Information: open this post in Google Chrome to view PDF file attached.


Highly available cloud storage is often implemented with complex, multi-tiered distributed systems built on top of clusters of commodity servers and disk drives. Sophisticated management, load balancing and recovery techniques are needed to achieve high performance and availability amidst an abundance of failure sources that include software, hardware, network connectivity, and power issues. While there is a relative wealth of failure studies of individual components of storage systems, such as disk drives, relatively little has been reported so far on the overall availability behavior of large cloud-based storage services. We characterize the availability properties of cloud storage systems based on an extensive one year study of Google’s main storage infrastructure and present statistical models that enable further insight into the impact of multiple design choices, such as data placement and replication strategies. With these models we compare data availability under a variety of system parameters given the real patterns of failures observed in our fleet.

Citation: “Availability in Globally Distributed Storage Systems”, Daniel Ford, Francois Labelle, Florentina Popovici, Murray Stokely, Van-Anh Truong, Luiz BarrosoCarrie GrimesSean QuinlanProceedings of the 9th USENIX Symposium on Operating Systems Design and Implementation, 2010.