ACM Transactions on Computer Systems (TOCS)
Track-Aligned Extents: Matching Access Patterns to Disk Drive Characteristics
FAST '02 Proceedings of the Conference on File and Storage Technologies
Freeblock Scheduling Outside of Disk Firmware
FAST '02 Proceedings of the Conference on File and Storage Technologies
TrustedBSD: Adding Trusted Operating System Features to FreeBSD
Proceedings of the FREENIX Track: 2001 USENIX Annual Technical Conference
Recent Filesystem Optimisations on FreeBSD
Proceedings of the FREENIX Track: 2002 USENIX Annual Technical Conference
Timing-Accurate Storage Emulation
FAST '02 Proceedings of the Conference on File and Storage Technologies
Running "Fsck" in the background
BSDC'02 Proceedings of the BSD Conference 2002 on BSD Conference
Journaling versus soft updates: asynchronous meta-data protection in file systems
ATEC '00 Proceedings of the annual conference on USENIX Annual Technical Conference
Scalability in the XFS file system
ATEC '96 Proceedings of the 1996 annual conference on USENIX Annual Technical Conference
A comparison of FFS disk allocation policies
ATEC '96 Proceedings of the 1996 annual conference on USENIX Annual Technical Conference
ALS '01 Proceedings of the 5th annual Linux Showcase & Conference - Volume 5
Soft updates: a technique for eliminating most synchronous writes in the fast filesystem
ATEC '99 Proceedings of the annual conference on USENIX Annual Technical Conference
The Design and Implementation of the 4.4 BSD Operating System
The Design and Implementation of the 4.4 BSD Operating System
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This paper describes a new version of the fast filesystem, UFS2, designed to run on multi-terabyte storage systems. It gives the motivation behind coming up with a new on-disk format rather than trying to continue enhancing the existing fast-filesystem format. It describes the new features and capabilities in UFS2 including extended attributes, new and higher resolution time stamps, dynamically allocated inodes, and an expanded boot block area. It also describes the features and capabilities that were considered but rejected giving the reasons for their rejection. Next it covers changes that were made to the soft update code to support the new capabilities and to enable it to work more smoothly with existing filesystems. The paper covers enhancements made to support live dumps and changes made to filesystem snapshots needed to avoid deadlocks and to enable them to work efficiently with multi-terabyte filesystems. Similarly, it describes changes that needed to be made to the filesystem check program to work with large filesystems. The paper gives some comments about performance, and decribes areas for future work including an extent-based allocation mechanism and indexed directory structures. The paper concludes with current status and availability of UFS2.