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Re: Moving partition to an overlapping position

From: Szakacsits Szabolcs
Subject: Re: Moving partition to an overlapping position
Date: Wed, 20 Jul 2005 11:22:21 +0200 (MEST)

On Wed, 20 Jul 2005, K.G. wrote:

> All Parted operations are theoretically power-loss proof, including resizing
> supported FS. 

I'm interested how. I know it's possible but it's not always very trivial.

In the general case ensuring consistency is difficult. Disks and
controllers can lie that data is on the disk platter but in real they 
keep it in their cache which can get lost during power outage.

They also reorder data for performance, so it's possible that what you
think is already written out (sync also doesn't give guarantee), in real
isn't but things what you didn't sync latter on are already on the

> I think introducing non power-loss proof operations could be
> disturbing. It would be better to write another program to perform
> such operations.

Power outage is not a common case and everybody should have always backups
because fatal disk failures are much-much more common.


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