Hi Saifi,
This is what i found over net:
The EXT3-fs message is just telling you it mounted the fs OK. It's
also telling you what form of journaling you are using.
ext3 has 2 formats of journal:
version 1 - default and only possibility for ext3 releases 0.0.3*
and earlier
version 2 - default for filesystems created with 0.0.4 and later
Version 2 journals support additional semantics required to allow
metadata journaling, and provide 2 new forms of journaling - ordered
and writeback. Both V1 & V2 journals support data journaling (where
everything that would go to disk is journaled).
The CHANGES file in the distribution says this: New mount options:
"mount -o journal=update"
Mounts a filesystem with a Version 1 journal, upgrading the
journal dynamically to Version 2.
"mount -o data=journal"
Journals all data and metadata, so data is written twice. This
is the mode which all prior versions of ext3 used.
"mount -o data=ordered"
Only journals metadata changes, but data updates are flushed to
disk before any transactions commit. Data writes are not atomic
but this mode still guarantees that after a crash, files will
never contain stale data blocks from old files.
"mount -o data=writeback"
Only journals metadata changes, and data updates are entirely
left to the normal "sync" process. After a crash, files will
may contain stale data blocks from old files: this mode is
exactly equivalent to running ext2 with a very fast fsck on reboot.
Ordered and Writeback data modes require a Version 2 journal: if you do
not update the journal format then only the Journaled data will be
allowed.
The default data mode is Journaled for a V1 journal, and Ordered for V2.
Thanks,
Narender Rao
