Kurt, was there any consensus on this thread? I am running tests on the same configuration (ext3 on RAID, with external journal)- are there any particular tests that you had run? I could run it on my systems too and post the results in the mailing list. --- Kurt Fitzner <kfitzner@xxxxxxxxxxxx> wrote: > Matt Bernstein wrote: > > On Apr 13 Kurt Fitzner wrote: > > > > There could be metadata which is only in the > journal, so failure probably > > means reboot + full fsck, so you may as well use > ext2 if your machine > > doesn't otherwise crash. > > > > Far preferable, I think, would be to put your > journal on a RAID 1 pair. > > I would like to think that if the ext3 driver > encountered an error > writing to the journal, that it would then skip the > journal and write > straight to the device - reverting to ext2 behavior. > There should never > be any loss of data (meta or otherwise) upon the > failure of a journal > device. That is, unless the failure of the > journaling device coincides > with a power failure. That is: > > 1) Failure of journaling device > 2) Attempted write of metadata to journal device > 3) Power failure before ext3 gives up on the > journaling device > > In that scenario, the ramification is the array > requiring a full fsck. > The benefit of running the journal on an external > device would far > outweigh the cost of a full fsck in the unlikely > event the above happens. > > I need to know, though, what exactly is the behavior > of ext3 in the > following situations: > - At system startup if there is a failure to > "mount" an external journal > - During operation if the external journal device > fails. > > Does ext3 then revert to non-journaled (ext2) > behavior in those instances? > > - > > > _______________________________________________ > > Ext3-users@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/ext3-users __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/ _______________________________________________ Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
