Chris Mason writes:
> XFS also allows a dedicated log device, not sure if ext3 does that yet or
> not.
Yes, it is possible to have a dedicated log device, although it is not
currently used. The ext3 JFS code is simply writing blocks to a file handle.
There are journal_init_file() and journal_init_dev() methods, but currently
only the journal_init_file() is called by ext3 code. However, I will
likely be making some changes to allow ext3 journalling to a device soon.
To be really useful (ala IBM JFS journal logical volumes), you need to be
able to journal multiple filesystems into a single device.
Cheers, Andreas
--
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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