Mailinglist Archive: opensuse-factory (279 mails)

["Carlos E. R." <robin.listas@xxxxxxxxxxxxxx>]

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Content-ID: <alpine.LSU.2.00.0903101448121.9084@xxxxxxxxxxxxxxxx>


On Tuesday, 2009-03-10 at 06:45 -0400, Greg Freemyer wrote:

> On Tue, Mar 10, 2009 at 12:05 AM, Carlos E. R.
> > On Monday, 2009-03-09 at 23:26 -0400, Greg Freemyer wrote:
> >
> > > > dd if=/dev/sda of=/dev/sdc bs=1G conv=noerror
> > >
> > > Please note, never use noerror without also using sync.
> >
> > Why? I'm curious. I can make a guess, but I'm not sure, it is not mentioned
> > in the manual:

...

> Look at the output of a dd run.
>
> dd if=/dev/zero of=/dev/null count=100
> 100+0 records in
> 100+0 records out
> 51200 bytes (51 kB) copied, 0.000172439 s, 297 MB/s
>
> The first 100 says 100 blocks read without error.  the first zero is 0
> failed blocks failed to read.
>
> The second 100 is the blocks written without error, and the second 0
> is the failed block writes.

Aha, ok...


> If you don't use sync and there are 2 errors I believe you get:
>
> 98+2 records in
> 98+0 records out.
>
> i.e The failed blocks are not replicated in the destination at all

I see... I don't know how to confirm this, though. It could be:

98+2 records out

instead. :-?

I wonder why they don't document this in the manual.


> With sync, you get:
> 98+2 records in
> 100+0 records out.

I suppose it is too late to know what Sid got.

> I'm not sure what the exact output block has in it but at least part
> of it is zero filled.  I always use a 4k block size to align my
> userspace behavior with the kernels normal page size.

Yes, that part is clear.

- -- 
Cheers,
       Carlos E. R.
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