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  From: Mark Newton <newton@atdot.dotat.org>
  To  : Matthew Tippett <mtippett@ticons.com.au>
  Date: Thu, 2 Sep 1999 09:36:33 +0930 (CST)

Re: Journaling ??

Matthew Tippett wrote:

 > A Journaling file system is fast. 

... if you have enough memory :-)

[ remember that the filesystem log is essentially a temporally-ordered
  sequential datastore, with little or no optimizations for filesystem
  block clustering, fragmentation, etc.  It's only fast if you have 
  large amounts of memory for caching, which is why (for example) XFS
  performance on IRIX isn't all that great if you have less than 128 Mbytes
  of RAM ]

The big advantage you get from it is reliability:  Due to the presence of
the log, filesystem operations can be rolled-back or replayed after a 
crash, making fsck unnecessary and making disk corruption a rarity.

   - mark

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I tried an internal modem,                    newton@atdot.dotat.org
     but it hurt when I walked.                          Mark Newton
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