What are the advantages of LVM?

[ruscook]

Michael T. Richter wrote:
> On Mon, 2006-22-05 at 14:42 +0900, Craig Hagerman wrote:
>> This is one of
>> the benefits of LVM. With LVM you can dynamically resize partitions.
>>     
>
> You know, I keep hearing this.  The problem is that, when I 
> experimented with LVM, I couldn't for the life of me figure out what 
> LVM brought to the equation.  I can resize ext2/3fs partitions as it 
> is without LVM.  The process sucks, is highly error prone and is 
> generally a worthless waste of time -- it's faster to tar, 
> repartition, restore -- but it can in theory be done.
>
> LVM looked to me like it could only resize partitions if I didn't care 
> about the actual data in it.  You know, as in tar, LVM resize, 
> restore.  So what have I been missing?
Michael, one cool feature of LVM is it can combine disks into one volume 
and dynamically resize volumes comprising multiple disks. Windows does 
this with dynamic partitions but I don't think it is as feature rich as LVM.

So /home is a partition of 100G, it fills up (as they do), so I buy a 
new 120GB HDD.
If /home is LVM I can create a physical volume on the new HDD and 
dynamically add it to /home making /home 220G.

This is much easier than alternatives requiring the data to be hived off 
etc..

-- 

Kind Regards Russell
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