Hi! Thanks for reporting this problem and digging further!
[...]
>
> When launching it by hand I get:
> # mdadm --create /dev/md1 --level=raid0 --force --run --raid-devices=2
> --spare-devices=0 /dev/sda3 /dev/sdb3
> mdadm: spare-devices setting is incompatible with raid level 0
>
> and without the spare-devices option, it works perfectly:
> # mdadm --create /dev/md1 --level=raid0 --force --run --raid-devices=2
> /dev/sda3 /dev/sdb3
> mdadm: /dev/sda3 appears to contain an ext2fs file system
> size=10490240K mtime=Mon Dec 8 17:34:30 2008
> mdadm: /dev/sda3 appears to be part of a raid array:
> level=raid0 devices=2 ctime=Mon Dec 8 17:34:24 2008
> mdadm: /dev/sdb3 appears to be part of a raid array:
> level=raid0 devices=2 ctime=Mon Dec 8 17:34:24 2008
> mdadm: array /dev/md1 started.
>
> I made this very quick and dirty patch:
> --- Commands.pm.orig 2008-12-08 15:56:58.000000000 +0100
> +++ Commands.pm 2008-12-08 17:33:23.000000000 +0100
> @@ -224,7 +224,7 @@
> $pre_req =~ s/^,//;
> &FAI::push_command(
> "yes | mdadm --create /dev/md$id --level=$level --force --run
> --raid-devices="
> - . scalar(@eff_devs) . " --spare-devices=" . scalar(@spares) . " "
> + . scalar(@eff_devs) . (scalar(@spares) !=0 ? " --spare-devices=" .
> scalar(@spares) : "") . " "
> . join(" ", @eff_devs) . " " . join(" ", @spares),
> "$pre_req", "exist_/dev/md$id" );
>
[...]
Hmm, looking at the mdadm code it rather seems that it is not that the option
must be removed if the number of spare devs is 0, but rather spare-devices must
not be used at all with raid 0. I'll try to come up with a patch that resolves
parts of this issue while parsing already.
Thanks again,
Michael
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