Molle Bestefich <molle.bestefich <at> gmail.com> writes:
> Karl Voit wrote:
> > Before that, I'd like to check again now with
> > the latest kernel and the latest mdadm:
> >
> > # mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
> > mdadm: No suitable drives found for /dev/md0
> > [ ... snip: same message with --run and --force ... ]
>
> No idea what that means, sorry.
> Check the MDADM source code, as far as I remember it's well commented.
;-)
Unfortunately I am mainly a user and not a good C programmer :-(
if (super == NULL) {
fprintf(stderr, Name ": No suitable drives found for %s\n", mddev);
[...]
Well I guess, the message will be shown, if the superblock is not found.
> > root <at> ned ~ # mdadm --zero-superblock /dev/sda
> > mdadm: Unrecognised md component device - /dev/sda
>
> Ack?
> No clue, sorry. Perhaps you've already zeroed that superblock?
Pretty sure, that this happened during my tests, yes.
> Check the source for the meaning of the message.
st = guess_super(fd);
if (st == NULL) {
if (!quiet)
fprintf(stderr, Name ": Unrecognised md component device - %s\n", dev);
[...]
Again: this seems to be the case, when the superblock is empty.
> Or try to get hold of our local target of godly worship, NeilB .
OK, then how can a dumb user, who deleted his own raid-superblocks, attract
local gods to help out with surprising sd[abcd]-reassembling-magic? ;-)
> > OK, those are other (newer) messages. Do they change anything or
> > should I try the commands above now?
>
> Depends how careful you are.
Since my miserably failure I am probably too careful *g*
The problem is also, that without deeper background knowledge, I can not
predict, if this or that permanently affects the real data on the disks.
Maybe such a person like me starts to think that sw-raid-tools like
mdadm should warn users before permanent changes are executed. If
mdadm should be used by users (additional to raid-geeks like you),
it might be a good idea to prevent data loss. (Ment as a suggestion.)
> Personally, I'd probably try and find out why the above commands fail,
> just in case there's something wrong with your new kernel or mdadm.
OK. I'll try my best.
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