[linux-lvm] Why is part of a PV not usable?

Stuart D. Gathman stuart at bmsi.com
Mon Jan 26 22:32:25 UTC 2009

On Mon, 26 Jan 2009, Allen, Jack wrote:

>         When I do "vgdisplay -v" or pvdisplay to see the PV, why is part
> of the PV not usable? 
>  --- Physical volume --- 
>   PV Name               /dev/sdd1 
>   VG Name               vg01 
>   PV Size               10.00 GB / not usable 3.98 MB 

Because the PV is divided into Physical Extents (PEs) of a fixed size.
Thus, you may waste up to just short of one PE to gain the flexibility
LVM offers.  Your PV is .02 PE short of 2560 PEs.

	      Stuart D. Gathman <stuart at bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

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