On Mon, 25 Aug 2014 11:34:03 +0000 Andy Smith <andy@xxxxxxxxxxxxxx> wrote:
> Hi Neil,
>
> On Mon, Aug 25, 2014 at 09:26:14PM +1000, NeilBrown wrote:
> > What does "mdadm --examine" on one of the devices report now that it is v1.0?
> >
> > Particularly interested in the "Unused Space :" line.
>
> /dev/sda3:
> Magic : a92b4efc
> Version : 1.0
> Feature Map : 0x0
> Array UUID : 3905b303:ca604b72:be5949c4:ab051b7a
> Name : 2
> Creation Time : Sun Jun 4 08:18:59 2006
> Raid Level : raid10
> Raid Devices : 6
>
> Avail Dev Size : 618726528 (295.03 GiB 316.79 GB)
> Array Size : 928089792 (885.10 GiB 950.36 GB)
> Super Offset : 618727392 sectors
> Unused Space : before=0 sectors, after=864 sectors
> State : active
> Device UUID : e30176be:81a57e84:1f2aa206:9515150f
>
> Update Time : Sun Aug 24 14:29:15 2014
> Checksum : bd599c72 - correct
> Events : 1
>
> Layout : near=2
> Chunk Size : 64K
>
> Device Role : Active device 5
> Array State : AAAAAA ('A' == active, '.' == missing, 'R' == replacing)
>
> All other devices report same (apart from UUID/checksum/role).
'after=864' should be plenty.
mdadm writes '128' to 'new_offset'
This is bigger than 'data_offset' (which must be zero, or it would have been
reported), mddev->dev_sectors is 618726528 while rdev->sectors is 618727392
(difference is 864), so
if (new_offset - rdev->data_offset
+ mddev->dev_sectors > rdev->sectors)
cannot return 'true'. Yet it seems that it does.
Ahh.. somewhere else returns -E2BIG:
if (mddev->pers && mddev->persistent &&
!super_types[mddev->major_version]
.allow_new_offset(rdev, new_offset))
return -E2BIG;
But super_1_allow_new_offset always succeeds if new_offset >
rdev->data_offset, so that cannot be the problem.
I know. rdev->sectors isn't "Super Offset", it is only "Avail Dev Size".
You need to
echo 618727392 > /sys/block/md2/md/dev-sda3/size
and same for the other devices.
I looks like I need to get mdadm to be more clever when it gets -E2BIG.
Can you check that the above works?
Thanks,
NeilBrown
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