LVM Maximum Volume Size?

[Paul Preston]

Yes it's available as a kernel mod. You will also need tools which you can install by adding xfsprogs.x86_64 package your system.

Read more before moving to xfs, there are some benefits and downsides...

Kind Regards,

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Paul Preston
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-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of Matty Sarro
Sent: 16 February 2011 21:24
To: General Red Hat Linux discussion list
Cc: Georgios Magklaras
Subject: Re: LVM Maximum Volume Size?

Is XFS available in RHEL5.4? Is there simply an RPM to download and install similar to CentOS?

On Wed, Feb 16, 2011 at 2:35 PM, Georgios Magklaras <georgios at biotek.uio.no> wrote:
> On 02/16/2011 07:16 PM, Matty Sarro wrote:
>>
>> Out of curiousity, what is the maximum size volume that LVM can
>> handle? I know that it sits as a wedge between the actual logical
>> volume the system sees, and the hardware. Is there a limit?
>>
>> At the moment we are looking at a maximum storage of 72TB for log
>> storage. My planned approach is to create a separate LUN and
>> disk-group for each folder on our log server, and then create a
>> logical volume and mount it under the FTP/NFS server's directory.
>> Then as more storage is needed, simply create a new LUN on the SAN,
>> add it as an LVM disk in the disk group for that particular folder,
>> and let LVM handle growing the logical volume. Is it bound to the
>> same disk max size as EXT3 (16TB)? Or is there another barrier to worry about?
>>
>> Am i misunderstanding the capabilities of LVM?
>>
>
> When considering storage at large quantities, the thing you have to
> start from is what happens at the logical volume level, where you have
> the filesystem. I believe that RHEL's ext3 and ext4 are still on a 16
> TB per filesystem (aka logical volume) limit. If you wish to go larger
> per logical volume/filesystem, in RHEL you need to look at XFS. In
> RHEL 6, an XFS filesystem is supported up to 100 Tbytes.
>
> To answer your original question, LVM2 on an 64bit CPU and a 2.6
> kernel can support up to 8EB per single LV. So, the limit is not LVM
> but your filesystem choice.
>
> GM
>
>
> --
> --
> George Magklaras
> Senior Systems Engineer/IT Manager
> Biotek Center, University of Oslo
> EMBnet TMPC Chair
>
> http://folk.uio.no/georgios
>
> Tel: +47 22840535
>
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