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EMC的说法
Centera implements content mirroring (content-parity protection), not disk mirroring. When it receives a request to store content, Centera asks the question: “Which two Centera nodes are least busy, are on separate power rails, and have sufficient space?”
The content of one drive can be mirrored to any multiple number of nodes within Centera. This enables a very short rebuild time, because Centera does not wait for one drive to rebuild. Rather, it asks the nodes that hold a single instance of content to quickly make a second copy on another available node. Thus, a number of nodes could be mirroring the same content at the same time.
Centera continuously checks content integrity three ways. Specifically by:
Constantly validating the integrity of its data objects and structure
Performing ongoing background data scrubbing: Are there two copies for every object? If not, it automatically makes a second copy.
Constantly checking authenticity to prevent data corruption
Centera determines the physical placement of content objects—System Administrators do not need to specify and manage the underlying file/LUN structure.
Centera also performs self-load balancing by:
Using multiple active network paths to each node
Handing off work to the least busy node
Sending work to nodes that are online rather than offline
Handling wild load fluctuations |
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楼主: dieyaoxiao
发表于 2009-03-20 09:42
发表于 2009-03-20 13:56
