Re: Best File System for partitions over 600GB

On Sun, 11 Mar 2007 21:58:29 -0400
Douglas Allan Tutty <dtutty@xxxxxxxxxxxxx> 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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