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Wednesday, March 22 • 11:00am - 11:50am
Evolving Ext4 for Shingled Disks - Abutalib Aghayev, CMU & Theodore Ts'o, Google

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Drive-Managed Shingled Magentic Recording (SMR) disks offer a higher capacity alternative to traditional disk drives. However, non-sequential workloads can show bi-modal behaviour. After a short period of high performance they enter a continuous period of low performance. We were able to make a small change (600 LOC) to ext4 that significantly improves the throughput in both modes, resulting in 2-13x improvements on metadata-heavy workloads, and 1.7-4.9x improvements on a file server benchmark. The changes also resulted in performance improvements on conventional disk drives.


Abutalib Aghayev

Graduate Student, Carnegie Mellon University
Abutalib Aghayev is a PhD student in the Computer Science department at Carnegie Mellon University.

Theodore Ts'o

Staff Programmer, Google
Theodore Ts'o is the first North American Linux Kernel Developer, and started working with Linux in September, 1991. He previously served as CTO for the Linux Foundation, and is currently employed at Google. Theodore is a Debian Developer, and is the maintainer of the ext4 file system in the Linux kernel. He is the maintainer and original author of the e2fsprogs userspace utilities for the ext2, ext3, and ext4 file systems.

Wednesday March 22, 2017 11:00am - 11:50am
Thomas Paine AB

Attendees (10)