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    • 2. 发明授权
    • System and method for modeling and optimizing I/O throughput of multiple disks on a bus
    • 用于建模和优化总线上多个磁盘的I / O吞吐量的系统和方法
    • US06260108B1
    • 2001-07-10
    • US09110114
    • 1998-07-02
    • Rakesh D. BarvePhillio B. GibbonsBruce K. HillyerYossi MatiasElizabeth ShriverJeffrey S. Vitter
    • Rakesh D. BarvePhillio B. GibbonsBruce K. HillyerYossi MatiasElizabeth ShriverJeffrey S. Vitter
    • G06F1200
    • G06F3/0613G06F3/0653G06F3/0689G06F12/0866
    • A method for estimating and read durations, in response to requests to read data blocks stored in the disk drives in a computer system having a plurality of disk drives. Each disk drive has a disk cache with a non-zero fence parameter value coupled to a host computer via a common bus. The method according to one embodiment, comprises the steps of: (a) measuring an overhead period corresponding to the time during which a request to read is transmitted to a disk drive via the bus; (b) measuring an expected minimum positioning time corresponding to the shortest time required for a disk drive to locate said data block; (c) measuring mechanism-to-cache read time corresponding to the time required for a disk drive to transfer a data portion BC to a disk cache; (d) measuring the time required to transfer data blocks stored in each of said disk caches to the host; and (e) adding the times measured at steps (a) through (d).
    • 响应于在具有多个磁盘驱动器的计算机系统中读取存储在磁盘驱动器中的数据块的请求来估计和读取持续时间的方法。 每个磁盘驱动器具有通过公共总线耦合到主计算机的非零栅栏参数值的磁盘高速缓存。 根据一个实施例的方法包括以下步骤:(a)测量对应于通过总线将读取请求发送到磁盘驱动器的时间的开销周期; (b)测量对应于磁盘驱动器定位所述数据块所需的最短时间的预期最小定位时间; (c)测量对应于磁盘驱动器将数据部分BC传送到磁盘高速缓存所需的时间的缓存读取时间; (d)测量将存储在每个所述盘高速缓存中的数据块传送到主机所需的时间; 和(e)加入在步骤(a)至(d)测量的时间。