Re: raid array with 3T disks and GPT partition

On Thu, Sep 01, 2011 at 04:59:13PM +0100, Robin Hill wrote:

On Thu Sep 01, 2011 at 05:47:59PM +0200, Louis-David Mitterrand wrote:

quoted

I'm trying to create a raid6 array from 10x3T disks. Since disks > 2T
must use the GPT partion table I used parted to created a single
partition on each drive with the correct GPT partion type.

Now how do I make sure that these partitions have the correct "raid
autodetect" (fd) id? Is it even still needed? I didn't find any way to
set that flag in (g)parted.

It's only needed for kernel auto-assembly (in which case you're also
limited to 0.90 metadata and 2TB drives), so no, there's no need to use
that. 0xDA seems to be the recommended partition type for RAID arrays
nowadays - that should prevent the OS from trying to read them directly.

Auto-assembly and metadata are not related: I regularly use 1.2 metadata
on non-boot partitions and they auto-assemble fine.

However lilo won't boot on anything other than 0.9, this I found the
hard way :)

Kernel auto-assembly seems quite useful and desirable to me, especially
when using, say, initrd to unlock dm-crypt partitions (no need to
configure madadm.conf in the initrd).

BTW, what is that 0xDA type?

Cheers,