LVM question

[Stephen M]

I went to the installfest and someone reminded me that in Debian, /
will be mounted as read only and I need to remount it as rw.  So once
he helped me with that I was able to see how to shrink/expand the
logical volume.

On Sun, Jul 19, 2015 at 12:30 PM, Matt Graham <mhgraham at crow202.org> wrote:
> On 2015-07-18 10:25, Stephen M wrote:
>>
>> The original size [of the LV was] 3G for my home directory. I am trying to
>> reduce it to 2G so then I can increase my /usr to 8G from 7G.
>
>
>> lvreduce -L 1G /dev/testLVM/lvhome
>> Do you really want to reduce lvhome? [y,n]: y
>>  Command failed with status code 5
>
>
> The man page for lvreduce says:
>
> -L, --size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]
> Reduce or set the logical volume size in units of megabytes. With the - sign
> the value will be subtracted from the logical volume's actual size and
> without it it will be taken as an absolute size.
>
> ...so it thought you were resizing the LV to 1G, and lvreduce probably is
> smart enough to tell that the filesystem on the LV is 2G in size.  You
> probably wanted "lvreduce -L 2G /dev/testlvm/lvhome" or "lvreduce -L -1G
> /dev/testlvm/lvhome".
>
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-- 
Stephen Melheim
602-400-7707
SMelheim85 at gmail.com