Re: [linux-lvm] Probs with lvm on large filesystem

[Heinz Mauelshagen <mauelshagen@redhat.com>]

Andreas,

this is a matter of units used.

fdisk shows 292555849728 Bytes / 1000^3 rounded to 292.5GB whereas
LVM uses 1024(2^10) per order of magnitude ->
292555849728 Bytes / 1024^3 = 272.45GB
(which it shows below in the vgdisplay output).

# lvcreate -c 8k -l 34873 -n lvo1 vg_daten

allocates all free physical extents in your VG to your new logical volume.

Regards,
Heinz    -- The LVM Guy --


On Fri, Feb 13, 2004 at 12:59:45PM +0100, Andreas Reschke wrote:
> Hello,
> we want to use our Red Hat Enterprise ES 3.0 with lvm as a file server. 
> The server is connected to a IBM Fast T 900 via qlogic2200 Fiber Channel. 
> On the FastT I have created a partition with 295 GB.
> Fdisk shows this partition as /dev/sda1 with 292,5 GB:
> 
> Output of fdisk:
> fdisk -l
> 
> Platte /dev/sda: 292.5 GByte, 292555849728 Byte
> 255 K�pfe, 63 Sektoren/Spuren, 35567 Zylinder
> Einheiten = Zylinder von 16065 * 512 = 8225280 Bytes
> 
>     Ger�t boot.  Anfang      Ende    Bl�cke   Id  Dateisystemtyp
> /dev/sda1             1     35567 285691896   8e  Linux LVM
> 
> [root@fastlinux lvmgui-0.4]# pvcreate  /dev/sda1
> pvcreate -- physical volume "/dev/sda1" successfully created
> 
> [root@fastlinux lvmgui-0.4]# vgcreate -s 8M vg_daten /dev/sda1
> vgcreate -- INFO: maximum logical volume size is 511.98 Gigabyte
> vgcreate -- doing automatic backup of volume group "vg_daten"
> vgcreate -- volume group "vg_daten" successfully created and activated
> 
> [root@fastlinux lvmgui-0.4]#lvcreate -c 8k -L 292G -n lvo1 vg_daten
> lvcreate -- only 34873 free physical extents in volume group "vg_daten"
> [root@fastlinux lvmgui-0.4]# lvcreate -c 1024k -L 292G -n lvo1 vg_daten
> lvcreate -- only 34873 free physical extents in volume group "vg_daten"
> 
> vgdisplay
> --- Volume group ---
> VG Name               vg_daten
> VG Access             read/write
> VG Status             available/resizable
> VG #                  0
> MAX LV                256
> Cur LV                0
> Open LV               0
> MAX LV Size           511.98 GB
> Max PV                256
> Cur PV                1
> Act PV                1
> VG Size               272.45 GB
> PE Size               8 MB
> Total PE              34873
> Alloc PE / Size       0 / 0
> Free  PE / Size       34873 / 272.45 GB
> VG UUID               OOjBLA-sHjN-LtHG-YRlE-JIRZ-miEk-m6S5vv
> 
> I have a volume group with maximum 511.98 Gigabyte and want to create a 
> logical volume with 292 GB (greater than 266 GB), but lvcreate allow only 
> 34873 extents (= 266 BG).
> 
> Where is the resulotion?
> 
> 
> 
> Thanks
> Andreas
> -- 
> BEHR GmbH & Co                          Tel. 0711-896-4598
> Andreas Reschke                         Fax: 0711-8902-4598
> Abteilung BG-IM23 IT-Services           Mobil: 0172-6307978
> Unix/Linux-Administration               andreas.reschke@behrgroup.com
> Siemensstrasse 164
> D-70469 Stuttgart
> 
> _______________________________________________
> linux-lvm mailing list
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Red Hat, Inc.
Consulting Development Engineer                   Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
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