Mailinglist Archive: opensuse-factory (279 mails)

[Sid Boyce <sboyce@xxxxxxxxxxxxxxxx>]

Carlos E. R. wrote:
> 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.
I can't remember what exactly I got, just that rsync failed somewhere
during the process.
Regards
Sid.
-- 
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks

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