[linux-lvm] Filesystem corruption with LVM's pvmove onto a PV with a larger physical block size

[Ingo Franzki]

On 05.03.2019 00:22, Nir Soffer wrote:
> On Tue, Mar 5, 2019 at 12:45 AM Cesare Leonardi <celeonar at gmail.com> wrote:
> 
>> On 02/03/19 21:25, Nir Soffer wrote:
>>> # mkfs.xfs /dev/test/lv1
>>> meta-data=/dev/test/lv1          isize=512    agcount=4, agsize=25600
>> blks
>>>           =                       sectsz=512   attr=2, projid32bit=1
>>>           =                       crc=1        finobt=1, sparse=0,
>>> rmapbt=0, reflink=0
>>> data     =                       bsize=4096   blocks=102400, imaxpct=25
>>>           =                       sunit=0      swidth=0 blks
>>> naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
>>> log      =internal log           bsize=4096   blocks=855, version=2
>>>           =                       sectsz=512   sunit=0 blks, lazy-count=1
>>> realtime =none                   extsz=4096   blocks=0, rtextents=0
>>
>> Has the problem here the same root as for ext4? I guess sectsz should be
>>  >=4096 to avoid troubles, isn't it?
>>
>> Just to draw some conlusion, could we say that currently, if we are
>> going to move data around with LVM, it's better to check that the
>> filesystem is using a block size >= than "blockdev --getbsz
>> DESTINATIONDEVICE"? At least with ext4 and xfs.
>>
>> Something that couldn't be true with really small devices (< 500 MB).
>>
>> Is there already an open bug regarding the problem discussed in this
>> thread?
>>
> 
> There is this bug about lvextend:
> https://bugzilla.redhat.com/1669751
> 
> And this old bug from 2011, discussing mixing PVs with different block size.
> Comment 2 is very clear about this issue:
> https://bugzilla.redhat.com/732980#c2
I don't have access to that one, can you cite comment 2 ?
> 
> Nir
> 


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Ingo Franzki
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