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Re: [linux-lvm] Stripes and PE's



On Fri, Jun 11, 2004 at 06:07:07PM -0600, Tyler wrote:
> I'm having problems creating a logical volume on a 4 disk SCSI volume group.
> I want to use the entire space as 1 LV that is striped, but can't seem to do
> it.
> 
> I get an error telling me I don't have enough Physical Extents, when I
> clearly do.

look at the output of 'pvs' - it will tell you the number of physical
extents free on each disk.  Take the lowest number of physical extents in
the set of PVs in your VG and multiply it by 4, then use that number when
doing your striping.  LVM requires each stripe to be on a separate PV
currently.

 
> livecd root # vgdisplay
>   --- Volume group ---
>   VG Name               group
>   System ID
>   Format                lvm2
>   Metadata Areas        4
>   Metadata Sequence No  1
>   VG Access             read/write
>   VG Status             resizable
>   MAX LV                255
>   Cur LV                0
>   Open LV               0
>   Max PV                255
>   Cur PV                4
>   Act PV                4
>   VG Size               13.91 GB
>   PE Size               4.00 MB
>   Total PE              3560
>   Alloc PE / Size       0 / 0
>   Free  PE / Size       3560 / 13.91 GB
>   VG UUID               DjxWid-oxqx-zol9-Lu8a-CO94-AsBn-c7k3le
> 
> livecd root # lvcreate -i4 -I16 -l3560 -nstorage group
>   Insufficient allocatable extents suitable for striping for logical volume
> storage: 3560 required
> livecd root # lvcreate -i4 -I16 -l3000 -nstorage group
>   Insufficient allocatable extents suitable for striping for logical volume
> storage: 3000 required
> 
> Even if I try to use less space then it says I have, it still wont let me.
> 
> I've had this error before, but never found a solution.  I also have not
> found the solution on the mailing list archives either.  I can create a
> contiguous LV, but without striping.  I'd like to have it striped if I
> could.
> 
> What am I doing wrong?
> 
> Tyler
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm redhat com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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