[linux-lvm] LVM limits on 64 bits

Heinz Mauelshagen mauelshagen at redhat.com
Thu May 6 11:01:38 UTC 2004

On Thu, May 06, 2004 at 11:01:32AM +0200, Yannick Lecaillez wrote:
> Hi !
> 	I'm new to the list and LVM.
> 	I whish to know the true maximum size for a logical volume, 
> volume group and how many physical volumes LVM can manage on a IA64
> system running RHEL 3.

Up to 256 PVs per VG and up to 256 LVs system total.
Up to 2TB per PV/LV because of the Linux 2.4 block device layer constraint.

Eg. create a VG with up to 256PVs, each 2TB in size -> 512TB VG size.
That VG can have as many as 256 LV, each max. 2TB in size.

You typically have more than 1 VG *and* the max. 256 LVs/system
still applies (eg, 2 VGs could have 156 LVs in the first one and up to 100 LVs
in the 2nd one).

> 	Numbers i found on the net found are old (2001/2002) and i
> need to deploy solution with several tera byte.

If you need more than 2TB/LV, the LVM1 compatible device-mapper/LVM2
in Linux 2.6 is your friend, because 2.6 supports large block devices
beyond 2TB.

> 	Thanks !
> _______________________________________________
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> linux-lvm at redhat.com
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


Heinz    -- The LVM Guy --

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


Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
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Mauelshagen at RedHat.com                            +49 2626 141200
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