[linux-lvm] LVM2 with disks greater than 2TB
jtracy at ist.ucf.edu
Tue Mar 28 19:20:50 UTC 2006
I recall having a similar problem when I setup a large array a long time
ago and it was related to the partition table if I remember correctly.
I wish I could remember more, but that was atleast 2 years ago.
Hopefully it can lead you in the right direction. I think I ended up
using and EFI partion table if I remember correctly.
> What concerns me is if I just try and make a single 4.54TB partition
> as reiserfs without using LVM2 and mount it, it still only shows up as
> ~560GB using df -h. This makes me think it maybe an os issue. Any
> Barnaby Claydon wrote:
>> Dan wrote:
>>> I have 24 - 500GB drives raided such that 11 drives + 1 hot spare
>>> per raid to get 4.54TB times 2. I want to use LVM2 to make this
>>> into one ~9TB disk, but when I create the partitions and do a df -h
>>> they show up as about 560GB each instead of 4.5TB each. I do an
>>> fdisk -l and they show up correctly. I am using Slackware 10.0. I
>>> have device-mapper and LVM2 correctly installed. I am obviously
>>> hitting a 2TB limit from what I have read, but does anyone know if
>>> it is possible to even do what I want? If so, any suggestions on
>>> what I need to install to get this to work? I am running the
>>> 184.108.40.206 kernel. Thanks
>> Dan, from the LVM2 FAQ (
>> http://www.tldp.org/HOWTO/LVM-HOWTO/lvm2faq.html ) it mentions:
>> * For 32-bit CPUs on 2.6 kernels, the maximum LV size is 16TB.
>> * For 64-bit CPUs on 2.6 kernels, the maximum LV size is 8EB. (Yes,
>> that is a very large number.)
>> From what I recall when I built my last LVM, it's a matter of setting
>> the PE size during creation (hopefully you haven't started filling
>> with data yet). I think the default causes you to hit the 2TB limit,
>> but it can definitely be set higher. The default PE Size seems to
>> depend on Linux distribution, but mine is at 4MB and I'm at 1.5TB
>> right now so the references to a 32MB default would definitely get
>> you to 9TB.
>> Sorry I can't offer any other specifics - hope that helps.
>> linux-lvm mailing list
>> linux-lvm at redhat.com
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> linux-lvm mailing list
> linux-lvm at redhat.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
University of Central Florida
Institute for Simulation and Training
jtracy at ist.ucf.edu
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