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bug-coreutils@HIDDEN:bug#68216; Package coreutils.
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Subject: Re: An instance of DD receiving data from another instance with bs=1M
reports the wrong record count.
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To: "jared@HIDDEN" <jared@HIDDEN>, 68216 <at> debbugs.gnu.org
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On 02/01/2024 10:45, jared@HIDDEN wrote:
> Hi all,
>
> It seems an instance of `dd` with only an output file doesn't report
> the count of records accurately despite bs= being described as
> influencing both ibs= and obs=
>
> dd'ing from an unstable remote over ssh today I had it continue from the
> last received block between crashes in preparation for a P2V. The remote
> had bs=1M set with its in=device and the local instance had bs=1M too
> with the destination of= device but upon referring to the receiving
> end's stable count of records I noticed it ignored my bs=1M setting.
> This were worked around using obs=1M to make the counter show a value I
> could reliable skip=/seek= with to resume.
>
> I have an example here:
>
> /$ dd if=/dev/zero bs=1M count=1 | dd bs=1M of=/dev/null
> 1+0 records in
> 1+0 records out
> 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0010021 s, 1.0 GB/s
> *0+16 records in
> 0+16 records out*
> 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.000771722 s, 1.4 GB/s/
>
> This is being experienced on Archlinux with kernel '6.6.4' and package
> 'core/coreutils 9.4-2'
>
> dd's man page for this distribution shows:
>
> /bs=BYTES
> read and write up to BYTES bytes at a time (default:
> 512); overrides ibs and obs/
>
> So I feel it not overriding obs= when invoked with only of= and bs=
> arguments could be a bug.
>
> Running a single dd with /if=source of=dest bs=1M/ works as intended.
>
> While in my case this isn't a fatal bug working with virtual block
> devices it could be problematic for use cases which require a proper
> treatment of block sizes such as tape devices.
Well the behavior is expected and documented:
‘bs=BYTES’
Set both input and output block sizes to BYTES. This makes ‘dd’
read and write BYTES per block, overriding any ‘ibs’ and ‘obs’
settings. In addition, if no data-transforming ‘conv’ operand is
specified, input is copied to the output as soon as it’s read, even
if it is smaller than the block size.
For details please see https://bugs.gnu.org/8171
thanks,
Pádraig.
bug-coreutils@HIDDEN:bug#68216; Package coreutils.
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Subject: An instance of DD receiving data from another instance with bs=1M
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From: "jared@HIDDEN" <jared@HIDDEN>
To: bug-coreutils@HIDDEN
Message-ID: <cd3307d5-4d61-4f8d-a569-1269e4c1d9cb@HIDDEN>
Subject: An instance of DD receiving data from another instance with bs=1M
reports the wrong record count.
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<p>Hi all,</p>
<p>It seems an instance of `dd`=C2=A0 with only an output file doesn'=
t
report the count of records accurately despite bs=3D being describe=
d
as influencing both ibs=3D and obs=3D</p>
<p>dd'ing from an unstable remote over ssh today I had it continue
from the last received block between crashes in preparation for a
P2V. The remote had bs=3D1M set with its in=3Ddevice and the local
instance had bs=3D1M too with the destination of=3D device but upon=
referring to the receiving end's stable count of records I noticed
it ignored my bs=3D1M setting. This were worked around using obs=3D=
1M
to make the counter show a value I could reliable skip=3D/seek=3D w=
ith
to resume.</p>
<p>I have an example here:</p>
<blockquote>
<p><i>$ dd if=3D/dev/zero bs=3D1M count=3D1 | dd bs=3D1M of=3D/dev/=
null<br>
1+0 records in<br>
1+0 records out<br>
1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0010021 s, 1.0 GB/s<b=
r>
<b>0+16 records in<br>
0+16 records out</b><br>
1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.000771722 s, 1.4
GB/s</i></p>
</blockquote>
<p>This is being experienced on Archlinux with kernel '6.6.4' and
package 'core/coreutils 9.4-2'</p>
<p>dd's man page for this distribution shows:</p>
<blockquote>
<p><i>bs=3DBYTES<br>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 read and write up to BYTES bytes at a time
(default: 512); overrides ibs and obs</i></p>
</blockquote>
<p>So I feel it not overriding obs=3D when invoked with only of=3D an=
d
bs=3D arguments could be a bug.</p>
<p>Running a single dd with <i>if=3Dsource of=3Ddest bs=3D1M</i> work=
s as
intended.</p>
<p>While in my case this isn't a fatal bug working with virtual
block devices it could be problematic for use cases which require
a proper treatment of block sizes such as tape devices.<br>
</p>
<p>Best regards,<br>
Jared<br>
</p>
</body>
</html>
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"jared@HIDDEN" <jared@HIDDEN>:bug-coreutils@HIDDEN.
Full text available.bug-coreutils@HIDDEN:bug#68216; Package coreutils.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.