On Sat, 2004-09-11 at 05:04, Pete Theisen wrote:
> Rather than silently leave corrupted files on disk,
Unless you force a reboot to do that (which is an option), or manually
force a mount without a consistency check (by using tune2fs to flip the
bit), this is virtually impossible with Linux.
It's the realm of FAT filesystems and the OSes that use them.
> or require an extensive "fsck" or "chkdsk" on recovery from a crash,
> a journaled file system like ext3 or ReiserFS can re-run or rollback
> updates to the file system to put it into a predictable and consistent
> state.
Typically. I've found both Ext3 and ReiserFS are very conservative and
respected in this regard. Unfortunately, because the internal structure
of ReiserFS changes by design, and I have caught at least one
distributor *COUGH*Mandrake*COUGH* not bothering to make sure the kernel
and user-space recovery tools match, I don't trust ReiserFS. If
ReiserFS drops out and requires an off-line repair, I immediately back
it up "raw" (dd) _before_ attempting to run those tools. This is in
addition to researching the _exact_ ReiserFS version in the kernel and
verify the user-space tools are 100% compatible.
[ NOTE: SuSE does probably the best job with ReiserFS. Better yet,
even one of their developers was honest enough to tell me to stick with
Ext3 back in 2000-2001 because of my requirements. ]
I also trust XFS explicitly. Other than one bug with XFS 1.1 that was
caught and fixed (it toasted the /var filesystem on two of my systems),
XFS is of the same proven quality as Ext3. It's internal structure
hasn't changed since it's introduction in the mid-'90s, and they ported
_everything_ over from IRIX almost verbatim. The 2.6 kernel's VFS also
benefits from a lot of SGI's GPL donations.
Of course, many 2.4 distributions did _not_ ship a completely XFS
kernel/user-space implementation *COUGH*Mandrake*COUGH*.
All my knowledge of JFS is second-hand (no personal experience). Since
it was ported from OS/2 and not AIX and missing a lot of UNIX compatible
interfaces that had to be retrofitted "clean room" (unlike XFS), for
what reasons I was dumb-founded until I read up on Project Monterey
later (i.e., SCO), it was the least compatible of any filesystem for my
needs when I first looked at it.
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