On Wed 28-03-07 10:17:33, [EMAIL PROTECTED] 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:[EMAIL PROTECTED]
> Sent: Wednesday, March 28, 2007 9:17 AM
> To: Jan Kara
> Cc: wheeler, richard; armangau, philippe; [EMAIL PROTECTED];
> [email protected]; [EMAIL PROTECTED]
> 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 <[EMAIL PROTECTED]>
SuSE CR Labs
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