Hi, On Thu, Jun 06, 2002 at 08:31:30AM +1200, Steve Wray <steve.wray@paradise.net.nz> wrote: > /dev/system/home /home ext3 data=journal 1 2 > > Its the bomb. I have a hell of a lot of dynamic data > in that /home so in event of a crash there was a big > chance of corruption. Not Any More!!!!! > 8-) I'm not quite sure why people think that data=journal is any "safer" than the default data=ordered mode. In fact, data=ordered could well be safer simply because the default mode is probably in use on more systems, and so is better tested. :-) data=journal writes the data to the journal as well as the metadata, but *both* ordered and data modes flush data to disk carefully as part of their transaction commit. If you create new files with the default of data=ordered, there is still an absolute guarantee that a transaction commit will show all the data safe on disk, and you will never see stale data blocks show up on disk after a crash. Only the looser "data=writeback" mode of ext3 relaxes this guarantee and makes data writes independent of metadata writes, as they are for most other filesystems. Cheers, Stephen _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
