On Wed 28-03-07 10:17:33, armangau_philippe@xxxxxxx wrote: > In my case the disk cache is not a problem - We use an emc disk array > the write cache is protected - > Once the data has made over the disk array we can assume it is safe - Then if you are able to reproduce the situation that not all data is written after fsync(); poweroff; that is a bug worth reporting.. Honza > > -----Original Message----- > From: John Anthony Kazos Jr. [mailto:jakj@xxxxxxxxxxx] > Sent: Wednesday, March 28, 2007 9:17 AM > To: Jan Kara > Cc: wheeler, richard; armangau, philippe; ext3-users@xxxxxxxxxx; > linux-ext4@xxxxxxxxxxxxxxx; csar@xxxxxxxxxxxx > Subject: Re: Ext3 behavior on power failure > > > If you fsync() your data, you are guaranteed that also your data are > > safely on disk when fsync returns. So what is the question here? > > Pardon a newbie's intrusion, but I do know this isn't true. There is a > window of possible loss because of the multitude of layers of caching, > especially within the drive itself. Unless there is a > super_duper_fsync() > that is able to actually poll the hardware and get a confirmation that > the > internal buffers are purged? > -- Jan Kara <jack@xxxxxxx> SuSE CR Labs - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
