When mdadm tries to assemble one working device and one zeroed-out device,
it failed but print successful message because there is --uuid option.
Following script always reproduce it.
dd if=/dev/zero of=/dev/ram0 oflag=direct
dd if=/dev/zero of=/dev/ram1 oflag=direct
./mdadm -C /dev/md111 -e 1.2 --uuid="12345678:12345678:12345678:12345678" \
-l1 -n2 /dev/ram0 /dev/ram1
./mdadm -S /dev/md111
dd if=/dev/zero of=/dev/ram1 oflag=direct
./mdadm -A /dev/md111 --uuid="12345678:12345678:12345678:12345678" \
/dev/ram0 /dev/ram1
Following is message from mdadm.
mdadm: No super block found on /dev/ram1 (Expected magic a92b4efc, got 00000000)
mdadm: no RAID superblock on /dev/ram1
mdadm: /dev/md111 assembled from 1 drive - need all 2 to start it (use --run to insist).
The mdadm say that it assembled but mdadm does not create /dev/md111.
The message is wrong.
After applying this patch, mdadm reports error correctly as following.
mdadm: No super block found on /dev/ram1 (Expected magic a92b4efc, got 00000000)
mdadm: no RAID superblock on /dev/ram1
mdadm: /dev/ram1 has no superblock - assembly aborted
Signed-off-by: Gioh Kim <gi-oh.kim@xxxxxxxxxxxxxxx>
---
Assemble.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Assemble.c b/Assemble.c
index 420c7b3..c1542f9 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -269,7 +269,7 @@ static int select_devices(struct mddev_dev *devlist,
if (auto_assem || !inargv)
/* Ignore unrecognised devices during auto-assembly */
goto loop;
- if (ident->uuid_set || ident->name[0] ||
+ if (ident->name[0] ||
ident->super_minor != UnSet)
/* Ignore unrecognised device if looking for
* specific array */
--
2.19.1
