Date: Sun, 6 Mar 2016 17:39:26 +0000 (UTC) From: Jason Helfman <jgh@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r48347 - head/en_US.ISO8859-1/books/arch-handbook/driverbasics Message-ID: <201603061739.u26HdQV6064675@repo.freebsd.org>
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Author: jgh Date: Sun Mar 6 17:39:25 2016 New Revision: 48347 URL: https://svnweb.freebsd.org/changeset/doc/48347 Log: - improve readability Submitted by: Chris Petrik Differential Revision: https://reviews.freebsd.org/D5557 (based on) Modified: head/en_US.ISO8859-1/books/arch-handbook/driverbasics/chapter.xml Modified: head/en_US.ISO8859-1/books/arch-handbook/driverbasics/chapter.xml ============================================================================== --- head/en_US.ISO8859-1/books/arch-handbook/driverbasics/chapter.xml Sun Mar 6 14:44:58 2016 (r48346) +++ head/en_US.ISO8859-1/books/arch-handbook/driverbasics/chapter.xml Sun Mar 6 17:39:25 2016 (r48347) @@ -385,12 +385,17 @@ Closing device "echo".</screen> block-devices almost unusable, or at least dangerously unreliable. The caching will reorder the sequence of write operations, depriving the application of the ability to know the - exact disk contents at any one instant in time. This makes - predictable and reliable crash recovery of on-disk data - structures (filesystems, databases etc.) impossible. Since + exact disk contents at any one instant in time.</para> + + <para> + This makes predictable and reliable crash recovery of on-disk + data structures (filesystems, databases etc.) impossible. Since writes may be delayed, there is no way the kernel can report to the application which particular write operation encountered a - write error, this further compounds the consistency problem. + write error, this further compounds the consistency + problem.</para> + + <para> For this reason, no serious applications rely on block devices, and in fact, almost all applications which access disks directly take great pains to specify that character (or
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