Re: How to recreate a dmraid RAID array with mdadm

[Neil Brown <neilb@suse.de>]

On Wed, 17 Nov 2010 21:05:40 -0500
Mike Viau <viaum@sheridanc.on.ca> 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.

NeilBrown

diff --git a/Assemble.c b/Assemble.c
index afd4e60..11e6238 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -344,9 +344,17 @@ int Assemble(struct supertype *st, char *mddev,
 		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)
+			if (report_missmatch) {
+				char buf[200];
 				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;
 		}
 		if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&

 		 	   		  
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