On Fri, 2005-02-18 at 12:27 -0800, Edward Cherlin wrote: [KSB] <...snip...>
> Don't think that a UPS is sufficient. A company near here got > shut down because of a gas leak, and wasn't permitted to fire up > the diesel UPS, or even to stay inside long enough to send a > warning to their customers. Critical systems need a two-site > solution, minimum. Very true. Many years ago someone inadvertently left an open can of pain thinner near an air vent at a bank's data center. Within a couple of hours, people were leaving the building because they felt sick, and a couple were carted off in ambulances. The building had to be evacuated. Even putting two data centers within 100km of each other doesn't provide isolation from natural disasters such as earthquakes and tidal Banking is a very competitive business, and that is why we developed logical dual site operation features for applications deployed on GT.M (logical dual site operation goes beyond just database replication). The one restriction we have not managed to work around, however, is that both sites need to be on Planet Earth, which means that if one data center is in Honolulu, Hawaii, the most you can isolate the other data center is to put it in Ghanzi, Botswana. Interestingly, it is easier dealing with unplanned events such as gas leaks, earthquakes and the like than it is dealing with planned events such as system and software upgrades, especially if the upgrade involves schema changes. Ultimately, the application software must deal with the problem, but GT.M provides hooks to facilitate logical dual site applications that can be continuously available in the face of both unplanned as well as planned events. -- Bhaskar ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Hardhats-members mailing list Hardhats-members@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hardhats-members
