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Martin Petersen

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Data corruption is an insidious problem in storage. While there are many forms of corruption, there are also many ways to prevent them. For example, enterprise class servers use error checking and correcting caches and memory to protect against single and double bit errors. System buses have similar protective measures such as parity. Communications going over the network are protected by checksums. On the storage side many installations employ RAID (Redundant Array of Inexpensive Disk) technology to protect against disk failure. In the case of hardware RAID, the array firmware will often use advanced checksumming techniques and media scrubbing to detect and potentially correct errors. The disk drives also feature sophisticated error corrective measures, and storage protocols such as Fibre Channel and iSCSI feature a Cyclic Redundancy Check (CRC) that guards against... (more)