Re: Ext4 data structures integrity

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On Fri, Oct 7, 2011 at 5:00 PM, Theodore Tso <tytso@xxxxxxx> wrote:
>
> On Oct 7, 2011, at 7:40 AM, Kasatkin, Dmitry wrote:
>
> For large file system to run fsck takes a while..
> One of the solution to decrease checking time is just to check only
> for multiply-claimed blocks...
> Could you please tell how many times faster it will be comparing just
> to running fsck as it is…
>
> In order to guard against multiply claimed blocks, you will need to complete
> fsck pass 1.
> You can time fsck pass1 for yourself by running e2fsck with the -tt option.
>  For ext3 pass 1 was approximately 70% of the total run time.  With ext4 the
> time to run pass 1 was significantly reduced.

Yes... It is really noticeable..
I assume it is achieved not by compromising check quality...
What is the reason?

Thanks

> - Ted
>
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