Re: [linux-lvm] calculating free capacity from pvdisplay and lvdisplay

From: Ray Morris <support@bettercgi.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] calculating free capacity from pvdisplay and lvdisplay
Date: Wed, 11 Aug 2010 12:19:50 -0500	[thread overview]
Message-ID: <1281547190.5708.0@raydesk1.bettercgi.com> (raw)
In-Reply-To: <AANLkTimUB-xWqJEteT6mvpLQ2Y4y1qGdGYK1LTz-bh=F@mail.gmail.com> (from rpnabar@gmail.com on Wed Aug 11 12:03:39 2010)

> Makes sense! The only reason that I was confused was why 3 of my PV's
> say "yes (but full)" and the other three not. How does one explain
> that?
> 
> 1.63x3=4.89 still less than 8.6.
> 
> Has the VG spanned across the first 3 PVs fully and then utilized the
> remaining 3 partially?

   Pretty much.  See man (8) lvm,  --alloc option
--
Ray Morris
support@bettercgi.com

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On 08/11/2010 12:03:39 PM, Rahul Nabar wrote:
> On Wed, Aug 11, 2010 at 1:10 AM, Ray Morris <support@bettercgi.com>  
> wrote:
> 
> Thanks Giorgio and Ray! That helps!
> >
> > df shows that your LVs take up 8.6TB: 6TB + 600 GB + 2 TB.
> > Therefore, you are using 8.6TB of disk space for those LVs.
> > Some of the space WITHIN each LV might not be used for files,
> > but it has been dedicated to that LV.
> 
> Makes sense! The only reason that I was confused was why 3 of my PV's
> say "yes (but full)" and the other three not. How does one explain
> that?
> 
> 1.63x3=4.89 still less than 8.6.
> 
> Has the VG spanned across the first 3 PVs fully and then utilized the
> remaining 3 partially?
> 
> 
> > I'm not good at explaining things, so sometimes I try explaining  
> three
> > different ways. �I have six cereal boxes, each half empty. �I put  
> the
> > boxes in a bag. �The bag is now full. �The cereal boxes may not be  
> full,
> > but they fill up the bag. �The cereal boxes are your half empty LVs  
> and
> > the bag is your drives.
> 
> Food based analogies are always good! :)
> 
> Giorgio:
> 
> The vgs output is exactly as you say:
> 
> [root@eustorage ~]# vgs
>   VG                      #PV #LV #SN Attr   VSize VFree
>   euclid_highperf_storage   6   3   0 wz--n- 9.80T 1.22T
> 
> --
> Rahul
> 
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> 
>