----- Message from sredfern@xxxxxxxxx ---------
Date: Mon, 22 Oct 2007 21:46:08 +1000
From: Sam Redfern <sredfern@xxxxxxxxx>
Reply-To: Sam Redfern <sredfern@xxxxxxxxx>
Subject: Fwd: issues rebuilding raid array.
To: linux-raid@xxxxxxxxxxxxxxx
The array was build using 2.6.18-7 Now i'm using 2.6.21-2
I'm trying to recreate the raid array with the following command and
this is the error I get:
mca4:~# mdadm -Av /dev/md1 /dev/sdb /dev/sdc /dev/sdd /dev/sde
/dev/sdf /dev/sdg
mdadm: looking for devices for /dev/md1
mdadm: no RAID superblock on /dev/sdc
mdadm: /dev/sdc has no superblock - assembly aborted
So I figure, oh look the disk sdc has gone cactus, I'll just remove it
from the list. One of the advantages of mdadm.
mca4:~# mdadm -Av /dev/md1 /dev/sdb /dev/sdd /dev/sde /dev/sdf /dev/sdg
mdadm: looking for devices for /dev/md1
mdadm: /dev/sdb is identified as a member of /dev/md1, slot -1.
mdadm: /dev/sdd is identified as a member of /dev/md1, slot 0.
mdadm: /dev/sde is identified as a member of /dev/md1, slot 1.
mdadm: /dev/sdf is identified as a member of /dev/md1, slot 5.
mdadm: /dev/sdg is identified as a member of /dev/md1, slot 4.
mdadm: added /dev/sde to /dev/md1 as 1
mdadm: no uptodate device for slot 2 of /dev/md1
mdadm: no uptodate device for slot 3 of /dev/md1
mdadm: added /dev/sdg to /dev/md1 as 4
mdadm: added /dev/sdf to /dev/md1 as 5
mdadm: failed to add /dev/sdb to /dev/md1: Invalid argument
mdadm: added /dev/sdd to /dev/md1 as 0
mdadm: /dev/md1 assembled from 4 drives - not enough to start the array.
If found this really difficult to understand considering that I can
get the output of mdamd -E /dev/sdb (other disks included to overload
you with information)
mdadm -E /dev/sd[b-h]
/dev/sdb:
Magic : a92b4efc
Version : 00.90.00
UUID : 4e3b82e1:f5604e19:a9c9775f:49745adf
Creation Time : Fri Oct 5 09:18:25 2007
Raid Level : raid5
Device Size : 312571136 (298.09 GiB 320.07 GB)
Array Size : 1562855680 (1490.46 GiB 1600.36 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 1
Update Time : Tue Oct 16 20:03:13 2007
State : clean
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Checksum : 80d47486 - correct
Events : 0.623738
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 6 8 16 -1 spare /dev/sdb
0 0 8 80 0 active sync /dev/sdf
1 1 8 128 1 active sync /dev/.static/dev/sdi
2 2 8 144 2 active sync /dev/.static/dev/sdj
3 3 8 16 3 active sync /dev/sdb
4 4 8 64 4 active sync /dev/sde
5 5 8 96 5 active sync /dev/sdg
If anyone could offer a solution I'd be forever grateful, also to prove that supporting open source isn't all free labour I'll send you can choose one of 1 of 2 Nintendo DS games, the new radiohead album or a cree flash light. :)
----- End message from sredfern@xxxxxxxxx -----Hey, this looks similar to what I recently had. (http://www.mail-archive.com/linux-raid@xxxxxxxxxxxxxxx/msg09306.html) I my case a RAID5 reshape was interrupted and the new devices were also marked spare with slot -1.
Apply the attached patch to mdadm-2.6.3, build then do: mdadm -S /dev/md1 ./mdadm -Av /dev/md1 --update=this /dev/sd[b-g] That should update the slot on /dev/sdb. Then: mdadm -S /dev/md1 ./mdadm -Av /dev/md1 /dev/sd[bcdefg] should bring back your array in degraded mode.If it works send your gifts to Neil Brown <neilb@xxxxxxx>, he wrote the patch! :)
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diff --git a/Grow.c b/Grow.c
index 825747e..8ad1537 100644
--- a/Grow.c
+++ b/Grow.c
@@ -978,5 +978,5 @@ int Grow_restart(struct supertype *st, struct mdinfo *info, int *fdlist, int cnt
/* And we are done! */
return 0;
}
- return 1;
+ return 0;
}
diff --git a/mdadm.c b/mdadm.c
index 40fdccf..7e7e803 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -584,6 +584,8 @@ int main(int argc, char *argv[])
exit(2);
}
update = optarg;
+ if (strcmp(update, "this")==0)
+ continue;
if (strcmp(update, "sparc2.2")==0)
continue;
if (strcmp(update, "super-minor") == 0)
diff --git a/super0.c b/super0.c
index 0396c2c..e33e623 100644
--- a/super0.c
+++ b/super0.c
@@ -394,6 +394,21 @@ static int update_super0(struct mdinfo *info, void *sbv, char *update,
fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
devname);
}
+ if (strcmp(update, "this") == 0) {
+ /* to fix a particular corrupt superblock.
+ */
+ int i;
+ for (i=0; i<10; i++)
+ if (sb->disks[i].major == sb->this_disk.major &&
+ sb->disks[i].minor == sb->this_disk.minor) {
+ if (sb->this_disk.number == sb->disks[i].number)
+ break;
+ fprintf(stderr, Name ": Setting this disk from %d to %d\n",
+ sb->this_disk.number, sb->disks[i].number);
+ sb->this_disk = sb->disks[i];
+ break;
+ }
+ }
if (strcmp(update, "super-minor") ==0) {
sb->md_minor = info->array.md_minor;
if (verbose > 0)
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