RE: How to recreate a dmraid RAID array with mdadm

[Mike Viau <viaum@sheridanc.on.ca>]

> On Thu, 18 Nov 2010 13:32:47 +1100 <neilb@suse.de> wrote:
> > ./mdadm -Ss
> >
> > mdadm: stopped /dev/md127
> >
> >
> > ./mdadm -Asvvv
> >
> > mdadm: looking for devices for further assembly
> > mdadm: no RAID superblock on /dev/dm-3
> > mdadm: /dev/dm-3 has wrong uuid.
> >  want UUID-084b969a:0808f5b8:6c784fb7:62659383
> > Segmentation fault
>
> Try this patch instead please.

Applied new patch and got:

./mdadm -Ss

mdadm: stopped /dev/md127


./mdadm -Asvvv
mdadm: looking for devices for further assembly
mdadm: no RAID superblock on /dev/dm-3
mdadm: /dev/dm-3 has wrong uuid.
 want UUID-084b969a:0808f5b8:6c784fb7:62659383
 tst=0x10dd010 sb=(nil)
Segmentation fault


Again tried various buffer sizes (segfault above was with char buf[200];)


if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
    (!tst || !tst->sb ||
     same_uuid(content->uuid, ident->uuid, tst->ss->swapuuid)==0)) {
        if (report_missmatch) {
             char buf[1<<16];
                fprintf(stderr, Name ": %s has wrong uuid.\n",
                        devname);
          fprintf(stderr, " want %s\n", __fname_from_uuid(ident->uuid, 0, buf, ':'));
             fprintf(stderr, " tst=%p sb=%p\n", tst, tst?tst->sb:NULL);
             if (tst) {
                       fprintf(stderr, " have %s\n", __fname_from_uuid(content->uuid, 0, buf, ':'));
                        fprintf(stderr, " metadata=%s\n", tst->ss->name);
             }
    }
        goto loop;
}