NDLI: Iris:An optimized I/O stack for low-latency storage devices

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Iris:An optimized I/O stack for low-latency storage devices

Content Provider	ACM Digital Library
Author	Bilas, Angelos Marazakis, Manolis Papagiannis, Anastasios Saloustros, Giorgos
Abstract	System software overheads in the I/O path, including VFS and file system code, become more pronounced with emerging low-latency storage devices. Currently, these overheads constitute the main bottleneck in the I/O path and they limit efficiency of modern storage systems. In this paper we present a taxonomy of the current state-of-the-art systems on accelerating accesses to fast storage devices. Furthermore, we present Iris, a new I/O path for applications, that minimizes overheads from system software in the common I/O path. The main idea is the separation of the control and data planes. The control plane consists of an unmodified Linux kernel and is responsible for handling data plane initialization and the normal processing path through the kernel for non-file related operations. The data plane is a lightweight mechanism to provide direct access to storage devices with minimum overheads and without sacrificing strong protection semantics. Iris requires neither hardware support from the storage devices nor changes in user applications. We evaluate our early prototype and we find that it achieves on a single core up to 1:7x and 2:2x better read and write random IOPS, respectively, compared to the XFS and EXT4 file systems. It also scales with the number of cores; using 4 cores Iris achieves 1:84x and 1:96x better read and write random IOPS, respectively. In sequential reads we provide similar performance and in sequential writes we are about 20% better compared to other file systems.
Starting Page	3
Ending Page	11
Page Count	9
File Format	PDF
ISSN	01635980
DOI	10.1145/3041710.3041713
Journal	ACM SIGOPS Operating Systems Review (OPSR)
Volume Number	50
Issue Number	3
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1975-04-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nvm Storage systems I/o Low latency Protection
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Hardware and Architecture Information Systems

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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Iris:An optimized I/O stack for low-latency storage devices