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- improve readability

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Submitted by:	Chris Petrik
Differential Revision:	https://reviews.freebsd.org/D5557 (based on)
This commit is contained in:
Jason Helfman 2016-03-06 17:39:25 +00:00
parent eecba3d819
commit e09f3d4522
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=48347
1 changed files with 9 additions and 4 deletions
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13
en_US.ISO8859-1/books/arch-handbook/driverbasics/chapter.xml
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@ -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