Re: [linux-lvm] Different PV on the same raid array

[Ray Morris <support@bettercgi.com>]

> To bypass the DOS MBR 2TB limits, i plan to use LVM to create on the
> same raid array some "small" PV (< 2TB)  that will be in the same big
> VG (> 2TB).
> 
> First, am i planning ugly thing ? is the GPT alternative a better
> way ?

   If you're not booting from the array, just make the array 
the PV.  Once you're past the BIOS boot, there's little reason
to have partitions at all since you're using LVM to divide the 
storage into appropriate volumes.  If you are booting from it
and therefore need partitions, GPT is the new standard for 
partitions.

> i would like that LVM use 1 PV first and then
> the second when the first come full  (not both at the same time).
> Maybe LVM do that by default, or do i need some option ? (i saw
> "--contiguous" in the lvcreate man pages, but dont know exactly what
> this option does ... )

  I think it does that by default, subject to certain other contraints
such as not putting both halves of a mirrored LV on the same PV.
-- 
Ray Morris
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On Thu, 24 Feb 2011 11:51:26 +0100
Cédric Lemarchand <cedric.lemarchand@ixcore.com> wrote:

> Hello,
> 
> To bypass the DOS MBR 2TB limits, i plan to use LVM to create on the
> same raid array some "small" PV (< 2TB)  that will be in the same big
> VG (> 2TB).
> 
> First, am i planning ugly thing ? is the GPT alternative a better
> way ?
> 
> Secondly, I dont know how LVM use PVs within a VG, but for
> performances issues, i would like that LVM use 1 PV first and then
> the second when the first come full  (not both at the same time).
> Maybe LVM do that by default, or do i need some option ? (i saw
> "--contiguous" in the lvcreate man pages, but dont know exactly what
> this option does ... )
> 
> 
> Thx
> 
> Cédric
> 
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