On 27.09.2014 17:21, Francis Moreau wrote:
> Hello,
>
> I'm looking at the module 'mdraid' of dracut (0.38) and was wondering
> the purpose of rd.md.uuid= parameter.
>
> I understand it can be used to selectively activate the array matching
> the UUID passed through the parameter but I'm wondering in which cases
> it can be useful...
>
> Also I don't really understand why dracut try to do its own mechanism to
> achieve that (by providing its own udev rules which are modified at boot
> time) whereas mdadm already provide the infrastructure (through
> mdadm.conf) in a cleaner way (IMHO).
If mdadm.conf is not included in the initramfs, you want to have a way to
prevent automatic assembly of all raids found. With big machines, lots of disk,
you only want to assemble those, which you really need.
>
> Another question, hopefully you don't mind: dracut provide an udev set
> of rules in a file named 59-persistent-storage-md.rules. I still don't
> really see the point since most of the stuff in it seems to already be
> done by the rule fileudev-md-raid-arrays.rules, shipped by mdadm (3.3.2).
That wasn't always the case in all distributions. Nowadays can probably be removed.
>
> Ah my last question not related to mdraid: why dracut uses stderr to
> print out all its messages: info, debug, error. Stderr is usually used
> for error/warning messages only.
>
> Thanks !
Hmm, not true.
warn() {
echo "Warning: $*" >&2
}
info() {
echo "$*"
}
see.. warn() goes to error, info() to stdout.
This is in the initramfs, though.
Or do you mean dracut the tool?
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