Compaq 3200 manual Data Protection, ECC Memory

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Data Protection

The Array Accelerator was designed to protect data integrity. Batteries and ECC memory protect the cache memory. This allows end users to take full advantage of the performance without sacrificing reliability.

The Array Accelerator is also removable. This, along with its integrated batteries, means the Array Accelerator can be removed from one Smart Array 3200 Controller and installed on another. If there is any data in the Array Accelerator that has not been written to the hard drive, it can be transferred to another Smart Array 3200 Controller. This might happen if the Smart Array 3200 Controller or server failed before the cached data could be stored on a drive.

ECC Memory

To assure further data integrity, the Array Accelerator cache is made up of Error Checking and Correcting (ECC) memory. ECC memory detects and corrects all single-bit memory errors in multiple DRAMs. It also detects all two-bit memory errors in any position and most three- and four-bit memory errors in a single DRAM. An entire DRAM can also fail without data loss. This ensures the correction of common memory errors without interrupting system operation.

Compaq Smart Array 3200 Controller Reference Guide