Tuning Mass Storage System Operation
Original Publication Date: 1979-Feb-01
Included in the Prior Art Database: 2005-Feb-19
A mass storage system connected to one or more hosts includes a data base memory (DBM) which supplies data under certain algorithmic control to a plurality of staged data units (SUs). Once the data is in the SUs, a storage control unit (SCU) fetches the data for use by the host. SCU also controls the transfer data from DBM to SUs. Access to the SUs creates contention between the host access and the DBM access. Resolution of the contention will vary with mass storage and data processing installation configurations as well as job stream characteristics. In analyzing mass storage performance, the effective data rates (EDRs) have to be analyzed. The system effective data rate (SEDR) is an indication of the effectiveness of the data transfer between the host and the SU's.