公开(公告)号：WO2016134303A1

公开(公告)日：2016-08-25

申请号：PCT/US2016/018751

申请日：2016-02-19

Applicant: NETAPP, INC.

Inventor： MCKEAN, Brian D. ,  UMMADI, Sandeep Kumar R.

IPC: G06F3/06 ,  G06F11/10 ,  G06F12/02

CPC classification number: G06F3/0619 ,  G06F3/0611 ,  G06F3/064 ,  G06F3/0653 ,  G06F3/068 ,  G06F3/0685

Abstract: A storage manager can reduce the overhead of parity based fault tolerance by leveraging the access performance of SSDs for the parities. Since reading a parity value can be considered a small read operation, the reading of parity from an SSD is an effectively "free" operation due to the substantially greater SSD read performance. With reading parity being an effectively free operation, placing parity on SSDs eliminates the parity read operations (in terms of time) from the parity based fault tolerance overhead. A storage manager can selectively place parity on SSDs from HDDs based on a criterion or criteria, which can relate to frequency of access to the data corresponding to the parity. The caching criterion can be defined to ensure the reduced overhead gained by reading parity values from a SSD outweighs any costs (e.g., SSD write endurance).

Abstract translation: 存储管理器可以通过利用SSD的访问性能来减少基于奇偶校验的容错的开销。 由于读取奇偶校验值可以被认为是小的读取操作，由于SSD读取性能大幅提高，因此从SSD读取奇偶校验是有效的“自由”操作。 读取奇偶校验是一个有效的免费操作，将SSD上的奇偶校验从基于奇偶校验的容错开销中消除奇偶读取操作（在时间上）。 存储管理器可以基于标准或标准来选择性地将HDD上的奇偶校验放置在HDD中，标准或标准可以与对应于奇偶校验的数据的访问频率有关。 可以定义缓存标准，以确保通过从SSD读取奇偶校验值而获得的减少的开销超过任何成本（例如，SSD写入耐力）。