[linux-lvm] size of a PV > 2TB possible? (kernel with LBD support)

[linux-lvm] size of a PV > 2TB possible? (kernel with LBD support)

[Sulla]

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Dear all!

I'm sorry I have to ask this question to this mailing list, but I have not
been able to find sufficient and conclusive informaiton on the web. The
mailing-list archive at redhat seems not to be searchable.

What is the maximum size of a PV in LVM2?

I run linux 2.6.24 kernel (Ubuntu server 8.04 LTS, 32bit i386) with lvm2
2.02.26 and mdadm 2.6.3.
The kernel has CONFIG_LBD=y in its configuration.

I currently use a 2TB (just under 2TB, 1.98TB actually) raid5 array /dev/mdN
as the one and only PV in a VG. I would like to grow the array by addition
of another disk to 3TB and then expand the PV.

As far as I understand mdadm, on a kernel with LBD support it should be able
to create a blockdevice >2TB, but I am not sure that LVM2 will accept it as
a PV.

The LVM2-Howto on TLDP (http://tldp.org/HOWTO/LVM-HOWTO/lvm2faq.html)
confirms that LVs can be >2TB (16TB on 32bit OS, 8EB on 64bit OS), but says
nothing at all about PVs. Could somebody add that information?

thanx for support
kind regards,
Sulla












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Re: [linux-lvm] size of a PV > 2TB possible? (kernel with LBD support)

[Steve Costaras]

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Yes, PV's can be larger than 2TiB.   I currently have PV's around 
5.46TiB here but have had them up to 10TiB on other machines.    Don't 
know what the max size is though.

Steve

On 01/02/2010 04:05, Sulla wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Dear all!
>
> I'm sorry I have to ask this question to this mailing list, but I have not
> been able to find sufficient and conclusive informaiton on the web. The
> mailing-list archive at redhat seems not to be searchable.
>
> What is the maximum size of a PV in LVM2?
>
> I run linux 2.6.24 kernel (Ubuntu server 8.04 LTS, 32bit i386) with lvm2
> 2.02.26 and mdadm 2.6.3.
> The kernel has CONFIG_LBD=y in its configuration.
>
> I currently use a 2TB (just under 2TB, 1.98TB actually) raid5 array /dev/mdN
> as the one and only PV in a VG. I would like to grow the array by addition
> of another disk to 3TB and then expand the PV.
>
> As far as I understand mdadm, on a kernel with LBD support it should be able
> to create a blockdevice>2TB, but I am not sure that LVM2 will accept it as
> a PV.
>
> The LVM2-Howto on TLDP (http://tldp.org/HOWTO/LVM-HOWTO/lvm2faq.html)
> confirms that LVs can be>2TB (16TB on 32bit OS, 8EB on 64bit OS), but says
> nothing at all about PVs. Could somebody add that information?
>
> thanx for support
> kind regards,
> Sulla
>
>
>
>
>
>
>
>
>
>
>
>
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> Version: GnuPG v1.4.2.1 (MingW32)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
>
> iD8DBQFLPxplR6b2EdogPFsRApOQAKCq5lWWCZEU3lOqDN0yNwtjSWTx/wCfb7Bu
> m2SeTwsAeRU3008a1RvWBC8=
> =IBoj
> -----END PGP SIGNATURE-----
>
> _______________________________________________
> 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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