Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 350
cache flush, interval, caching, capacity, coerced, coercion mode, consistency, check, check rate
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cache flush interval caching capacity coerced capacity coercion mode consistency check consistency check rate controller copyback A controller property that indicates how often the data cache is flushed. The process of using a high speed memory buffer to speed up a computer system's overall read/write performance. The cache can be accessed at a higher speed than a drive subsystem. To improve read performance, the cache usually contains the most recently accessed data, as well as data from adjacent drive sectors. To improve write performance, the cache may temporarily store data in accordance with its write back policies. A property that indicates the amount of storage space on a drive or virtual drive. A drive property indicating the capacity to which a drive has been coerced (forced) to make it compatible with other drives that are nominally the same capacity. For example, a 4 Gbyte drive from one manufacturer may be 4,196 Mbytes, and a 4 Gbyte from another manufacturer may be 4,128 Mbytes. These drives could be coerced to a usable capacity of 4,088 Mbytes each for use in a drive group in a storage configuration. A controller property indicating the capacity to which drives of nominally identical capacity are coerced (forced) to make them usable in a storage configuration. An operation that verifies that all stripes in a virtual drive with a redundant RAID level are consistent and that automatically fixes any errors. For RAID 1 drive groups, this operation verifies correct mirrored data for each stripe. The rate at which consistency check operations are run on a computer system. A chip that controls the transfer of data between the microprocessor and memory or between the microprocessor and a peripheral device such as a drive. RAID controllers perform RAID functions such as striping and mirroring to provide data protection. MegaRAID Storage Manager software runs on ThinkServer SAS controllers. The procedure used to copy data from a source drive of a virtual drive to a destination drive that is not a part of the virtual drive. The copyback operation is often used to create or restore a specific physical B-2 Glossary
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