[Ti] Journeling.

[David DelMonte]

Brilliant. thanks Glenn.


On Aug 5, 2004, at 6:37 PM, Glenn L. Austin wrote:

> on 8/5/04 3:02 AM, David DelMonte at ddelmonte at mac.com wrote:
>
>> Hi all.
>>
>> What does disk journalling provide?
>
> Basically, a journalled file system provides an additional, smaller
> operation to track changes made to the file system before the actual
> operation is executed. After the operation is complete, the journal 
> entry is
> marked as complete.  Basically, the OS keeps track of what it's doing, 
> kind
> of "going to do this," "doing this," "done with this."
>
> What it means to you is that if your computer crashes at some point, 
> then
> restarting the computer is much faster because all that needs to be 
> done to
> make the disk consistent is to play back the journal entries and 
> execute the
> operations.
>
>> What resources does it cost?
>
> Just some disk space and cost of some disk performance when writing.
>
> -- 
> Glenn L. Austin <><
> Computer Wizard and Race Car Driver
> <glenn at austin-home.com>
> <http://www.austin-home.com/glenn/>
>
>
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