Re: Best File System for partitions over 600GB
On Sun, 11 Mar 2007 21:58:29 -0400
Douglas Allan Tutty <dtutty@porchlight.ca> wrote:
[snip]
> possible but there could be some data corruption. ext3 journals data as
> well as metadata but takes forever to regenerate after a crash and there
> can still be errors.
>From man mount(8):
> Mount options for ext3
> The ‘ext3’ file system is a version of the ext2 file system which has
> been enhanced with journalling. It supports the same options as ext2
> as well as the following additions:
[snip]
> data=journal / data=ordered / data=writeback
> Specifies the journalling mode for file data. Metadata is
> always journaled. To use modes other than ordered on the root
> file system, pass the mode to the kernel as boot parameter, e.g.
> rootflags=data=journal.
>
> journal
> All data is committed into the journal prior to being
> written into the main file system.
>
> ordered
> This is the default mode. All data is forced directly
> out to the main file system prior to its metadata being
> committed to the journal.
>
> writeback
> Data ordering is not preserved - data may be written into
> the main file system after its metadata has been commit‐
> ted to the journal. This is rumoured to be the highest-
> throughput option. It guarantees internal file system
> integrity, however it can allow old data to appear in
> files after a crash and journal recovery.
So IUUC, ext3 only journals metadata by default, not data, although it
jounals data also if 'data=journal' is specified.
Celejar
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