LVM question

[Matt Graham]

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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