Scale and performance in a distributed file system
ACM Transactions on Computer Systems (TOCS)
The design and implementation of the 4.4BSD operating system
The design and implementation of the 4.4BSD operating system
Logical vs. physical file system backup
OSDI '99 Proceedings of the third symposium on Operating systems design and implementation
Soft updates: a solution to the metadata update problem in file systems
ACM Transactions on Computer Systems (TOCS)
Journaling versus soft updates: asynchronous meta-data protection in file systems
ATEC '00 Proceedings of the annual conference on USENIX Annual Technical Conference
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
Recent Filesystem Optimisations on FreeBSD
Proceedings of the FREENIX Track: 2002 USENIX Annual Technical Conference
Awarded Best Student Paper! -- A Framework for Building Unobtrusive Disk Maintenance Applications
FAST '04 Proceedings of the 3rd USENIX Conference on File and Storage Technologies
Meta-data snapshotting: a simple mechanism for file system consistency
SNAPI '03 Proceedings of the international workshop on Storage network architecture and parallel I/Os
The Conquest file system: Better performance through a disk/persistent-RAM hybrid design
ACM Transactions on Storage (TOS)
Reliability mechanisms for file systems using non-volatile memory as a metadata store
EMSOFT '06 Proceedings of the 6th ACM & IEEE International conference on Embedded software
Enhancements to the fast filesystem to support multi-terabyte storage systems
BSDC'03 Proceedings of the BSD Conference 2003 on BSD Conference
hFS: a hybrid file system prototype for improving small file and metadata performance
Proceedings of the 2nd ACM SIGOPS/EuroSys European Conference on Computer Systems 2007
PRIMS: making NVRAM suitable for extremely reliable storage
HotDep'07 Proceedings of the 3rd workshop on on Hot Topics in System Dependability
A transparently-scalable metadata service for the Ursa Minor storage system
USENIXATC'10 Proceedings of the 2010 USENIX conference on USENIX annual technical conference
A framework for building unobtrusive disk maintenance applications
FAST'04 Proceedings of the 3rd USENIX conference on File and storage technologies
FAST'12 Proceedings of the 10th USENIX conference on File and Storage Technologies
Ffsck: The Fast File-System Checker
ACM Transactions on Storage (TOS)
Ffsck: the fast file system checker
FAST'13 Proceedings of the 11th USENIX conference on File and Storage Technologies
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Traditionally, recovery of a BSD fast filesystem after an uncontrolled system crash such as a power failure or a system panic required the use of the filesystem checking program, "fsck". Because the filesystem cannot be used while it is being checked by "fsck", a large server may experience unacceptably long periods of unavailability after a crash. Rather than write a new version of "fsck" that can run on an active filesystem, I have added the ability to take a snapshot of a filesystem partition to create a quiescent filesystem on which a slightly modified version of the traditinal "fsck" can run. A key feature of these snapshots is that they usually require filesystem write activity to be suspended for less than one second. The suspension time is independent of the size of the filesystem. To reduce the number and types of corruption, soft updates were added to ensure that the only filesystem inconsistencies are lost resources. With these two additions it is now possible to bring the system up immediately after a crash and then run checks to reclaim the lost resources on the active filesystems. Background "fsck" runs by taking a snapshot and then running its traditional first four passes to calculate the correct bitmaps for the allocations in the filesystem snapshot. From these bitmaps, "fsck" finds any lost resources and invokes special system calls to reclaim them in the underlying active filesystem.