I think I've found an overflow.
After thinking about this for a while I decided to create a new array of all 8
partitions and overwrite the old one.
I was counting on almost all data would be intact, if the partitions in the
new raid5 array were in the order as in the overwritten array - the reshape
process got 98.1% done after all.
So I executed:
#
mdadm --create --verbose /dev/md5 --level=5 --raid-devices=8 /dev/sdb1
/dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 64K
mdadm: /dev/sdb1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: /dev/sde1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: /dev/sdf1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: /dev/sdg1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: /dev/sdh1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: /dev/sdi1 appears to be part of a raid array:
level=raid5 devices=8 ctime=Fri Dec 8 18:08:42 2006
mdadm: size set to 312568576K
Continue creating array? y
mdadm: array /dev/md5 started.
>From what I could tell all the data was still there, so I guessed right and
got the same data structure.
BUT the new array is ONLY 42gb and there is 8 partitions of 320gb each, so it
does look like a overflow or similar.
Here's the detailed information of the newly created array (check the array
and device size):
# mdadm -D /dev/md5
/dev/md5:
Version : 00.90.03
Creation Time : Fri Dec 8 19:07:26 2006
Raid Level : raid5
Array Size : 40496384 (38.62 GiB 41.47 GB)
Device Size : 312568576 (298.09 GiB 320.07 GB)
Raid Devices : 8
Total Devices : 8
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Fri Dec 8 19:07:26 2006
State : clean, degraded, recovering
Active Devices : 7
Working Devices : 8
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
Rebuild Status : 0% complete
UUID : a24c9a1d:6ff2910a:9e2ad3b1:f5e7c6a5
Events : 0.1
Number Major Minor RaidDevice State
0 8 81 0 active sync /dev/sdf1
1 8 97 1 active sync /dev/sdg1
2 8 113 2 active sync /dev/sdh1
3 8 129 3 active sync /dev/sdi1
4 8 65 4 active sync /dev/sde1
5 8 49 5 active sync /dev/sdd1
6 8 33 6 active sync /dev/sdc1
8 8 17 7 spare rebuilding /dev/sdb1
On Friday 01 December 2006 12:18, you wrote:
> Hey again :-)
>
> I'm starting to suspect that its a bug, since all I did was straight
> forward and it worked many times before.
>
> When I try to stop the array by executing "mdadm -S /dev/md5", then mdadm
> stall (i'm suspecting it hit an error - maybe the same one).
>
> I also tryed to restart the computer and made sure the array didnt
> auto-start. I then manually started it and the reshape process it shown
> when
> executing "cat /proc/mdstat", but it doesnt proceed (it seems stalled right
> away). When I try to stop it as shown above, it then stall mdadm like
> before. So I'm able to reproduce the error.
>
> I've tryed with kernel 2.6.18.3, 2.6.18.4 and 2.6.19 - with the same
> results as described above.
>
> In case its a bug, then I would really like to help out, so its fixed and
> noone else will experience it (and I get my array fixed). What can I do to
> make sure its a bug and if it is, then what kind of information will be
> helpfull and where should I submit it?
>
> I've checked the source code (raid5.c), but there's no comment included in
> the code, so I cant do much myself since my code experience with C is very
> small when it comes to kernel programming.
>
> On Thursday 30 November 2006 08:04, Jacob Schmidt Madsen wrote:
> > Hey
> >
> > I bought 2 new disks to be included in a big raid5 array.
> >
> > I executed:
> > # mdadm /dev/md5 -a /dev/sdh1
> > # mdadm /dev/md5 -a /dev/sdi1
> > # mdadm --grow /dev/md5 --raid-disks=8
> >
> > After 12 hours it stalled:
> > # cat /proc/mdstat
> > md5 : active raid5 sdc1[6] sdb1[7] sdi1[3] sdh1[2] sdg1[1] sdf1[0]
> > sde1[4] sdd1[5]
> > 1562842880 blocks super 0.91 level 5, 64k chunk, algorithm 2 [8/8]
> > [UUUUUUUU]
> > [===================>.] reshape = 98.1% (306783360/312568576)
> > finish=668.7min speed=144K/sec
> >
> > Its been stuck at 306783360/312568576 for hours now.
> >
> > When i check the kernel log it is full of "compute_blocknr: map not
> > correct".
> >
> > I guess something went really bad? If someone know what is going on or if
> > someone know what i can do to fix this.
> > I would really be sad if all the data was gone.
> >
> > Thanks!
> > -
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