I was just reading up on some things from 3ware which is who makes the
cards I am using. They say to use gnu parted instead of fdisk because
fdisk doesn't support > 2TB disks. I am not sure if this still holds
true since the article was from June 2004 but I will try it and let
everyone know how I make out.
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
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