Bug#688757: pvmove onto disk with different sector size hazardous

Ritesh Raj Sarraf rrs at debian.org
Tue Sep 25 13:59:54 UTC 2012

On Tuesday 25 September 2012 06:15 PM, Daniel Pocock wrote:
> Package: lvm2
> Version: 2.02.95-4
> Severity: severe
> I have marked this `severe' because it has a high probability of
> filesystem corruption and drives with 4096 byte sectors are likely to
> become much more widespread.
> I recently purchased a 3TB drive and created one big 3TB partition for lvm
> I then used pvmove to move some filesystems from my internal drive to
> the external drive.  As a test run, I was just moving filesystems that
> were mounted but with no open files.
> Many errors appeared during the pvmove operation
> I unmounted them all and did an fsck on all of them and they are all
> clean.  Mounting them again, some fail to mount, this error is in dmesg:
>   error: fsblocksize 1024 too small for hardware sectorsize 4096
> The old disk has 512 byte sectors and the new disk has 4096 byte sectors.
Please wait for the actual response from the maintainer (Bastian).

I just was curious and wanted to ask. Irrespective of what the physical
block sizes are, currently still the logical block sizes are reported
512 bytes. Right?
In that case, I am not sure why your file system is bailing out.

Ritesh Raj Sarraf | http://people.debian.org/~rrs
Debian - The Universal Operating System

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