Bug#619545: pvcreate: man page should list dataalignment default

[Tomas Pospisek]

Hello Matt,

On Tue, 10 Nov 2015, Matt Taggart wrote:

> Tomas Pospisek writes:
>> Matt Taggart wrote on 24 Mar 2011:
>>
>>> [snip]
>>> The vgcreate(8) man page does list a default of 4 MB for
>>> --physicalextentsize but does it really use that as the default always
>>
>> FWIW: it does as of lvm 2.02.95-8/wheezy
>> *t
>
> OK, so
> 1) pvcreate(8) still needs to list defaults for --dataalignment and
> --dataalignmentoffset
>
> 2) without going into too much specifics about tuning, I think the
> vgcreate(8) man page should probably mention something like
>
>  "physicalextentsize should be equal to or larger than, and a multiple of
> the PV dataalignment setting"
>
> but someone who understands the tuning issues can probably improve on the
> above.

I *think* if you want to improve lvm's docu the most effective action 
would be to take these suggestions upstream [1]: while I am not 
sufficiently informed on the state of lvm maintenance in Debian, I see 
that there hasn't been any action on various bug reports/patches in its 
bug tracker that naively would seem to be easy to act on. Meanwhile from 
the few bug reports upstream that I have looked at, I got the impression 
that upstream is quite responsive.

@Debian LVM maintainers:

I very much appreciate your effort and am thankful that I am able to use 
lvm in Debian. In my above comment I do not want to imply any judgement on 
the quality of the maintenance of lvm.

Thanks,
*t

[1] https://www.sourceware.org/lvm2/