Re: RFC: mdadm and bringing up raid sets from initrd (dracut)

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 07/14/2009 03:39 PM, Doug Ledford wrote:
> On Jul 14, 2009, at 6:59 AM, Hans de Goede wrote:
>> Hi,
>>
>> As you probably know I'm working on making Fedora 12 use mdraid
>> instead of dmraid for Intel BIOS-RAID setups.
>>
>> The installer (anaconda) part is mostly done (needs more testing)
>> and now I'm looking at implementing support for this in dracut
>> (the new mkinitrd for Fedora 12).
>>
>> So I've been testing how this works for both imsm mdraid sets
>> and native mdraid metadata sets, in both cases using a 2 disk
>> mirror, so that the set can also be brought up in degraded mode.
>>
>> Currently the udev rules use incremental assembly like this:
>> mdadm -I /dev/mdraid-member
>
> Hmmm...does dracut use udev during initramfs time?

Yes, it uses udev for everything, making discovery of / consistent
with the discovery of other storage devices.

<snip>

> Are we going to be totally changing this with
> dracut and F12? This method very nicely resolves the issues you posted.
>

Yes.

Regards,

Hans