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NetBSD feature end-of-life announcement: soft dependencies

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From: Andrew Doran <ad@...>
To: <netbsd-announce@...>
Subject: NetBSD feature end-of-life announcement: soft dependencies
Date: Saturday, December 13, 2008 - 5:51 pm

Soft dependencies, also known as soft updates or softdep, is a method of

maintaining file system integrity across an unscheduled system shutdown.  It

improves file system performance by allowing metadata writes to the file

system to take place asynchronously.  Soft dependencies was introduced with

NetBSD 1.5.


The upcoming 5.0 release of NetBSD will include an alternative technology

contributed by Wasabi Systems Inc.: Write Ahead Physical Block Logging, or

logging.  Logging will provide a feature set and performance profile

superior to soft dependencies.  One compelling advantage is that file

systems using it need not be checked with the fsck utility after an

unscheduled system shutdown.


In NetBSD 5.0 both soft dependencies and an experimental, preview

implementation of logging will be available.  From NetBSD 6.0 onwards, soft

dependencies will no longer be shipped as part of the system and logging

will be the preferred method of maintaining file system integrity with FFS

file systems.


Thanks,

Andrew
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