Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral monitoring
Patent
1997-09-24
2000-08-29
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral monitoring
709105, 711114, G06F 300, G06F 1300
Patent
active
061122572
ABSTRACT:
The invention relates generally to mass storage systems, and in particular to mass storage systems in which stored logical volumes are duplicated in mirrored form. The system includes a method for dynamically adjusting the mirror service policy for a disk drive system by periodically collecting statistics describing the reading and writing of data to mirrored logical volumes of the system in successive time periods and determining, from time to time, from the collected statistics, whether the mirror service policy should continue or should change. In particular, the system takes into account activity levels at the physical devices and results in more efficient accessing of logical volume pairs as well as a better balance of loading and accessing the logical volumes.
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Arnon Dan
Bachmat Eitan
Mason, Jr. Robert S.
Ofek Yuval
Vishlitzky Natan
EMC Corporation
Lee Thomas C.
Wang Albert
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