On 10/20/2014 01:02 PM, Harald Hoyer wrote:
> 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.
>
Ok but why mdadm.conf wouldn't be included in the initramfs ? If one
doesn't want to start all arrays during the boot process, it's very
likely he doesn't start all arrays automatically while the system is
running, no ?
>>
>> 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?
>
Yes I meant dracut tool used to generate initramfs.
Thanks.
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