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Re: [linux-lvm] LVM2 with disks greater than 2TB

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 thoughts?

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 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.


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