JP Vossen on 8 Oct 2010 22:55:36 -0700

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Re: [PLUG] CentOS 5 on>2TB disks

> Date: Fri, 08 Oct 2010 07:12:57 -0400
> From: Carl Johnson
> Why not stick /boot on a usb drive? Sounded plausible to me.

Because they are going into customer's data centers... :-) And there's lots and lots of them.

Date: Fri, 8 Oct 2010 07:13:32 -0400
From: Doug Stewart

Why not map an LVM on top for everything with a single non-LVM
partition cut for /boot at ~100MB?

Because it's hardware RAID, so the physical device itself is >2TB, thus forcing GPT instead of MBR.

Date: Fri, 8 Oct 2010 08:34:12 -0400
From: Gordon Dexter

Have you considered making a hybrid MBR?  This means you have both a GPT and
an MBR partition table.  The GPT is in a different location so tools
designed for MBR don't interfere with it.  Normally when you have a GPT the
MBR is initialized to contain one partition, spanning the entire disk, of
type 0xEE (GPT).  But there are tools designed to copy the layouts of the
first four partitions from the GPT to the MBR so that older tools can still
work.  I'm not sure what effect this has on how the kernel reads the
partition table on >2TB disks, but it's worth looking into.

Now that's a new one on me. It looks like I'd have to either use a patched grub or grub2 anyway though. If I could find a grub2 for CentOS 5.5 (both 32 and 64 bit) that I liked, I *think* everything else will work. Nice writeup at:

But I don't see Grub2 for RHEL5 in EPEL (think "Universe" for RHEL, and only for Fedora 10+ on pbone. One of the Fedora ones would *probably* work, but...

I am going to have to tackle this in the next 3-4 months, so I'll do a follow-up when I finally figure it out.

Thanks for thinking about it and for the feedback,
JP Vossen, CISSP            |:::======|
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