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RAID Doesn’t Make the Grade for Big Storage

Added: Friday July 26th 2013 at 12:19:20 PM

As our appetite for storage continues to increase, we find ourselves moving to larger disks and larger arrays. In the past, RAID fit the bill as the statistical probability of two disks failing at the same time was low. As the number of disks and storage demands increase, so does the probability for two drives to fail at the same time, or while another drive is recovering.

SAS drives are generally rated with a bit error rate of 1x1016 bits. That means 1 in every 10 quadrillion bits may be unrecoverable. That number may seem unimaginably large, but if we convert that to terabits, it translates to 1 bit in 9094tb transacted. This wasn’t a problem in the past, but when we start to fill 24 drive chaises with 2TB drives, the risk becomes more tangible.

For organizations storing 10TB or more, the safer option is data replication. Data replicas can be stored in the same building, site, region, or anywhere in the world; providing both protection from multiple drive failures and disaster recovery solutions.


Sebastian Abbinanti, CCNA, C|EH

Chief Technology Officer

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