Re: [gentoo-user] dd says no space left on device

[Mick]

On Sunday 15 May 2011 19:15:16 Volker Armin Hemmann wrote:
> On Sunday 15 May 2011 18:52:21 Mick wrote:
> > On Sunday 15 May 2011 08:45:05 Adam Carter wrote:
> > > I'm cloning a windows disk using gentoo;
> > >
> > > On the old 66GB disk;
> > > # dd if=/dev/sdb of=/root/winmbr.bin bs=512 count=1
> > > # dd if=/dev/sdb1 bs=10M | gzip -v > winpartition.gz
> > >
> > > Then after swapping in the new 500GB disk;
> > > dd if=/root/winmbr.bin of=/dev/sdb bs=512 count=1
> > > # gunzip -c winpartition.gz | dd of=/dev/sdb1 bs=10M
> > > dd: writing `/dev/sdb1': No space left on device
> > > 0+306 records in
> > > 0+305 records out
> > > 10137600 bytes (10 MB) copied, 0.109885 s, 92.3 MB/s
> > > # fdisk -l /dev/sdb
> > >
> > > Disk /dev/sdb: 500.1 GB, 500107862016 bytes
> > > 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
> > > Units = sectors of 1 * 512 = 512 bytes
> > > Sector size (logical/physical): 512 bytes / 512 bytes
> > > I/O size (minimum/optimal): 512 bytes / 512 bytes
> > > Disk identifier: 0xe3f7e3f7
> > >
> > >    Device Boot      Start         End      Blocks   Id  System
> > >
> > > /dev/sdb1   *      206848   117207039    58500096    7  HPFS/NTFS/exFAT
> > >
> > > Why is dd saying no space left after copying 10MB when sdb1 is 65GB?
> >
> > Not sure if the bs=10M is too large?
> >
> > You can try finding the optimum size of the bs= value by creating a
> > partition on the new disk, formating it and then run something like:
> >
> > dd if=/dev/zero bs=1024 count=1000000 of=/1G_test.file
> > dd if=/dev/zero bs=2048 count=500000 of=/1G_test.file
> > dd if=/dev/zero bs=4096 count=250000 of=/1G_test.file
> > dd if=/dev/zero bs=8192 count=125000 of=/1G_test.file
> >
> > and compare the results that dd reports.  bs=4096 often gives best
> > performance (on my drives at least) but with the new 1T+ drives you may
> > find that another block size does the job better.
> >
> > Then zero the drive first using dd:
> >
> > dd if=/dev/zero of=/dev/sdb bs=4096 oflag=direct conv=notrunc
> >
> > and try repeating your restoring from back up with a more suitable block
> > size.
>
> a) sector sizes are mentioned in the docu
> b) compeletly unrelated.

You're right, but why is it stopping after the first 10M is transferred then?
-- 
Regards,
Mick