IBM 86655RY Hardware Maintenance Manual - Page 224

synchronization The process that reads all the data bits of the entire logical drive, calculates the parity bit for the data, compares the calculated parity with the existing parity, and updates the existing parity if inconsistent. SYS System. TAP Tape. throughput A measure of the amount of work performed by a computer system over a period of time, for example, number of jobs per day. toggle To switch between two modes. WB Write-back. write-back WB. The write policy mode that sends a completion status to the system when the data is entered into memory. Compare with write-through. write operation An output operation that sends a processed record to an output device or an output file. write policy The mode set by the system controller that determines when the completion status is sent to the system; it can be either when the data is written to the hard disk (write-through mode) or when the data is entered into memory (write-back mode). WT Write-through. write-through WT. The write policy mode that sends a completion status to the system when the data is written to the device. Compare with write-back. 214 Hardware Maintenance Manual: Netfinity 7600 - Type 8665 Models 1RY, 2RY