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List:       centos
Subject:    Re: [CentOS] can't create large LVM,
From:       Robert Heller <heller () deepsoft ! com>
Date:       2011-02-25 22:00:04
Message-ID: 201102252200.p1PM04EO012276 () sharky ! deepsoft ! com
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At Fri, 25 Feb 2011 23:18:43 +0200 CentOS mailing list <centos@centos.org> wrote:

> 
> On Fri, Feb 25, 2011 at 4:00 PM, Lamar Owen <lowen@pari.edu> wrote:
> > On Friday, February 25, 2011 08:15:34 am Rudi Ahlers wrote:
> > > [root@francois-pc ~]# lvcreate -L 500gig -n 500G freenas
> > > Insufficient free extents (127999) in volume group freenas: 128000 required
> > 
> > > How do I actually create a 500GB volume?
> > 
> > try
> > lvcreate -l 127999 -n 500G freenas
> > 
> > The default '500G' size is 12,800 extents, but you only have 12,799 extents free; \
> > which gets rounded *up* to 500G by the free space display.  And that's a \
> > lower-case 'L' option, not an upper-case 'I' option. \
> > _______________________________________________
> 
> 
> 
> Cool, thanx for the explanation. Why is there one extend "missing", or
> no usable?

Overhead (LVM meta data needs to be stored someplace) and/or roundoff
error. It is not really a 500G partition, it is like a 499.99<mumble>G
partition, which is displayed as a 'human readable' 500G.

> 
> 

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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