公开(公告)号：WO2008054760A3

公开(公告)日：2009-09-24

申请号：PCT/US2007022962

申请日：2007-10-31

Applicant: NETWORK APPLIANCE INC

Inventor： TAYLOR JAMES A

IPC: G06F11/10 ,  G06F3/06

CPC classification number: G06F3/0611 ,  G06F3/0659 ,  G06F3/0685 ,  G06F11/1076 ,  G06F2211/1052 ,  G06F2211/1054

Abstract: Embodiments of the present invention provide a method, system, and computer program product for optimizing I/O operations performed by a storage server operating on behalf of multiple clients to access data on a plurality of storage devices (disks). Embodiments of the present invention eliminate the need for selected read operations to write new data to physical data blocks by zeroing the physical data blocks to which new data will be written. Additionally, the need for reading old parity to compute new parity is eliminated. Instead, new parity is computed from the data to be written without the need of old parity or the storage server sends a command to a disk that stores parity. A module implemented at the disk that stores parity executes the command without reading, by the storage server, old parity. Eliminating the need for reading old data and for reading old parity eliminates some rotation latency and improves overall system's performance.

Abstract translation: 本发明的实施例提供了一种方法，系统和计算机程序产品，用于优化由代表多个客户机操作的存储服务器执行的访问多个存储设备（盘）上的数据的I / O操作。 本发明的实施例消除了对所选择的读操作的需要，通过对要写入新数据的物理数据块进行归零来将新数据写入物理数据块。 此外，消除了阅读旧奇偶校验以计算新奇偶校验的需要。 相反，从要写入的数据计算新的奇偶校验，而不需要旧的奇偶校验，或者存储服务器向存储奇偶校验的磁盘发送命令。 在存储奇偶校验的磁盘上实现的模块执行命令，而不通过存储服务器读取旧的奇偶校验。 消除读取旧数据和阅读旧校验的需要消除了一些旋转延迟并提高了整个系统的性能。