This paper presents a Virtual Persistent Cache design to remedy the long latency behavior and to ultimately improve the write responsiveness of the Host-Aware Shingled Magnetic Recording (HA-SMR) drives. Our design keeps the cost-effective model of the existing HA-SMR drives, but at the same time asks the great help from the host system for adaptively providing some computing and management resources to improve the drive performance when needed. The technical contribution is to trick the HA-SMR drives by smartly reshaping the access patterns to HA-SMR drives, so as to avoid the occurrences of long latencies in most cases and thus to ultimately improve the drive performance and responsiveness. We conduct experiments on real Seagate 8 TB HA-SMR drives to demonstrate the advantages of Virtual Persistent Cache over the real workloads from Microsoft Research Cambridge. The results show that the proposed design can remedy most of the long latencies and improve the drive performance by at least 58.11 percent, under the evaluated workloads.
Bibliographical noteFunding Information:
This paper is an extended version of a paper appeared in International Conference on Computer-Aided Design (ICCAD), Irvine, California, USA, Nov. 13-16, 2017 . This work is supported in part by Ministry of Science and Technology (MOST) under grant Nos. 105-2221-E-001-013-MY3, 105-2221-E-001-004-MY2, 105-3111-Y-001-041, and 104-2221-E-002-219-MY3, and is partially supported by US National Science Foundation (NSF) awards 130523, 1421913, 1439622 and 1525617.
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- long latency behavior
- persistent cache
- shingled magnetic recording (SMR)