Transaction Support using Compound Commands in Key-Value SSDs


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%.

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@inproceedings {234741,
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 = {},
publisher = {{USENIX} Association},