[CentOS] raid on large disks?

Wed Oct 12 16:22:05 UTC 2011
David Miller <david3d at gmail.com>

On Wed, Oct 12, 2011 at 12:20 PM, David Miller <david3d at gmail.com> wrote:

> On Wed, Oct 12, 2011 at 12:14 PM, Les Mikesell <lesmikesell at gmail.com>wrote:
>> On Wed, Oct 12, 2011 at 11:09 AM, John R Pierce <pierce at hogranch.com>
>> wrote:
>> >> What's the right way to set up>2TB partitions for raid1 autoassembly?
>> >>   I don't need to boot from this but I'd like it to come up and mount
>> >> automatically at boot.
>> >
>> > disks 2TB and up have to be formatted as GPT rather than MBR, so old MBR
>> > tools like fdisk are useless.  use parted
>> >
>> > I would build a LVM vg with the multi-terabyte volumes, using lvm
>> > mirroring, and then create an XFS lv on the vg ....     xfs seems 100%
>> > stable and high performance on centos6
>> What I'm looking for is the way to make md raid autodetect and
>> assemble on boot.  With fdisk, you would set the partition type to FD
>> for that, but I don't see an equivalent in parted.
> With GPT that's set using flags.  This is done in parted with the command
> "set <partition number> raid on"

I just thought of one other thing.  You'll want to read up on bios boot if
these large drives are being used for the grub boot loader.