dirty region

Such testing systems can cost $150,000 or more, and agency officials said they did not know how many machines would be needed to service the more than 60 million cars in the 80 dirtiest regions.

The mirrors support dirty region logging (DRL, called resync regions in DiskSuite) and logging support for RAID-5.

While the proposed rules would relax the standards on transient spikes in pollution that are less likely to be serious health hazards, new controls would greatly increase compliance problems for relatively dirty regions, including Southern California, New York City and Houston.