Sang-Hoon Kim, Ajou University; Jinhong Kim and Kisik Jeong, Sungkyunkwan University; Jin-Soo Kim, Seoul National University
Recently proposed key-value SSD (KVSSD) provides the popular and versatile key-value interface at the device level, promising high performance and simplified storage management with the minimal involvement of the host software. However, its I/O command set over NVMe is defined on a per key-value pair basis, enforcing the host to post key-value operations to KVSSD independently. This not only incurs high interfacing overhead for small key-value operations but also makes it subtle to support transactions in KVSSDs without a software support.
In this paper, we propose compound commands for KVSSDs. The compound command allows the host to specify multiple key-value pairs in a single NVMe operation, thereby effectively amortizing I/O interfacing overhead. In addition, it provides an effective way for defining a transaction comprised of multiple key-value pairs. Our evaluation using a prototype KVSSD and an in-house KVSSD emulator shows promising benefits of the compound command, with improving the performance by up to 55%.
Open Access Media
USENIX is committed to Open Access to the research presented at our events. Papers and proceedings are freely available to everyone once the event begins. Any video, audio, and/or slides that are posted after the event are also free and open to everyone. Support USENIX and our commitment to Open Access.
author = {Sang-Hoon Kim and Jinhong Kim and Kisik Jeong and Jin-Soo Kim},
title = {Transaction Support using Compound Commands in {Key-Value} {SSDs}},
booktitle = {11th USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage 19)},
year = {2019},
address = {Renton, WA},
url = {https://www.usenix.org/conference/hotstorage19/presentation/kim},
publisher = {USENIX Association},
month = jul
}
