[SM-Discuss] fresh install questions
charkins at upl.cs.wisc.edu
Thu Jul 25 16:41:53 EDT 2002
IIRC, ext3 is the only of the three that journals data portions of the
filesystem. Reiser and XFS only journal the file metadata (name, size,
On Thu, 25 Jul 2002, Ryan Abrams wrote:
> That is an absolutely ridiculous way to handle files in a modern file
> system. To the point that if it's true, I suggest no one use XFS.
> The whole point of journaling is that it keeps a journal of what it's doing,
> so that interruptions don't break things. So if XFS moves the pointer, it
> should have a journal entry saying where it was moved from. If the file isnt
> properly closed, the journal should revert it back to it's old space.
> Otherwise the whole advantage is lost.
> Basically, if you have a journaling file system that zeros out the whole
> file if it's open when you crash, you need a different file system...
> Because that one's on crack.
> Course, it may have been an old bug they fixed. :)
> On 7/25/02 4:00 AM, "Phil/CERisE/KG6MBQ" <cerise at littlegreenmen.armory.com>
> > bluebird at optushome.com.au said:
> >> That's interesting, I thought that a major advantage of
> >> journaling file systems like Reiser & XFS was there ability
> >> to recover from sudden crashes.
> >> Cheers
> >> Joel
> > Well, the problem in the case of XFS is with open files. I don't
> > know the internals well enough to comment on why they're suddenly
> > replaced with binary zeros. I suspect it's because when it opens a
> > file, it preallocates a space for it and sets all the appropriate
> > pointers to the new place on disk.
> > They recover faster in the sense that fsck has very little work to
> > do by comparison. They don't necessarily recover better.
> > With this in mind, I haven't had that problem with XFS for a good
> > long while. About 5 months or so of constant use have gone by without
> > problems.
> > -Phil/CERisE
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