Dell 341-7212 User Guide - Page 81

Coercion Mode A controller property indicating the size to which disk drives of nominally identical capacity are coerced (forced) in order to make them usable in a storage configuration. consistency check An operation that verifies that all stripes in a virtual disk with a redundant RAID level are consistent and that automatically fixes any errors. For RAID 1 disk groups, this operation verifies correct mirrored data for each stripe. Consistency Check Rate The rate at which consistency check operations are run on a computer system. controller A chip that controls the transfer of data between the microprocessor and memory or between the microprocessor and a peripheral device such as a physical disk. RAID controllers perform RAID functions such as striping and mirroring to provide data protection. Dell SAS RAID Storage Manager runs on the Dell PERC 5/i, PERC 6/i, SAS 5/iR, and SAS 6/iR controllers. Current Write Policy A virtual disk property that indicates whether the virtual disk currently supports Write back or Write through mode. • In Write back mode the controller sends a data transfer completion signal to the host when the controller cache has received all the data in a transaction. • In Write through mode the controller sends a data transfer completion signal to the host when the disk subsystem has received all the data in a transaction. Default Write Policy A virtual disk property indicating whether the default write policy is Write through or Write back. In Write back mode the controller sends a data transfer completion signal to the host when the controller cache has received all the data in a transaction. In Write through mode the controller sends a data transfer completion signal to the host when the disk subsystem has received all the data in a transaction. Glossary 81