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 - Thx Philippe -----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? - 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
