[linux-lvm] LVM2 with disks greater than 2TB
Dan
lvm at the-rusty-nail.com
Tue Mar 28 21:24:50 UTC 2006
It was indeed a partition problem. Thanks. fdisk does not support
partitions over 2TB so I had to use GNU Parted to setup the partition
with a GPT label that supports over 2TB. I could then create reiserfs
filesystems and got two 4.6TB partitions. Unfortunately Parted and GPT
do not support LVM so I could not raid the two partitions into one giant
one unless I am missing something. But the 2 partitions will work fine
for what I need. For anyone who might be interested I found the info I
needed at the links below:
http://www.coraid.com/support/linux/contrib/chernow/gpt.html
http://www.gnu.org/software/parted/manual/html_chapter/
http://www.wlug.org.nz/GPT
Judd Tracy wrote:
> 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.
>
> Judd
>
> Dan wrote:
>
>> 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
>>>> 2.6.15.4 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.
>>>
>>> -Barnaby
>>>
>>>
>>> _______________________________________________
>>> linux-lvm mailing list
>>> linux-lvm at 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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>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>
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