On Mon, Apr 6, 2015 at 11:30 PM, NeilBrown <neilb@xxxxxxx> wrote:
>
> Try:
> mdadm -S /dev/md124
> mdadm -A /dev/md124 --update=revert-reshape /dev/md/alpha /dev/md/beta
> mdadm -S /dev/md124
> mdadm -A /dev/md124 -vvv /dev/md/alpha /dev/md/beta /dev/md/gamma
>
> What does that report?
>
> NeilBrown
>
# mdadm --stop /dev/md124
mdadm: stopped /dev/md124
# mdadm -A /dev/md124 --update=revert-reshape /dev/md/alpha /dev/md/beta
mdadm: /dev/md124 assembled from 2 drives - not enough to start the array.
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [raid1] [raid10] [raid0]
[linear] [multipath]
md124 : inactive md126[0](S) md127[1](S)
3907022200 blocks super 1.2
md0 : active raid1 sda5[0] sdb2[1]
107652416 blocks [2/2] [UU]
bitmap: 1/1 pages [4KB], 65536KB chunk
md125 : active raid1 sdh1[0] sdg1[1]
2930134016 blocks super 1.2 [2/2] [UU]
bitmap: 0/22 pages [0KB], 65536KB chunk
md126 : active raid1 sdc1[0] sdd1[1]
1953512312 blocks super 1.2 [2/2] [UU]
md127 : active raid1 sde1[2] sdf1[1]
1953512312 blocks super 1.2 [2/2] [UU]
unused devices: <none>
# mdadm --stop /dev/md124
mdadm: stopped /dev/md124
# mdadm -A /dev/md124 -vvv /dev/md/alpha /dev/md/beta /dev/md/gamma
mdadm: looking for devices for /dev/md124
mdadm: UUID differs from /dev/md0.
mdadm: UUID differs from /dev/md/alpha.
mdadm: UUID differs from /dev/md/beta.
mdadm: UUID differs from /dev/md/gamma.
mdadm: UUID differs from /dev/md0.
mdadm: UUID differs from /dev/md/alpha.
mdadm: UUID differs from /dev/md/beta.
mdadm: UUID differs from /dev/md/gamma.
mdadm: UUID differs from /dev/md0.
mdadm: UUID differs from /dev/md/alpha.
mdadm: UUID differs from /dev/md/beta.
mdadm: UUID differs from /dev/md/gamma.
mdadm: /dev/md/alpha is identified as a member of /dev/md124, slot 1.
mdadm: /dev/md/beta is identified as a member of /dev/md124, slot 0.
mdadm: /dev/md/gamma is identified as a member of /dev/md124, slot 2.
mdadm: :/dev/md124 has an active reshape - checking if critical
section needs to be restored
mdadm: added /dev/md/alpha to /dev/md124 as 1
mdadm: added /dev/md/gamma to /dev/md124 as 2 (possibly out of date)
mdadm: no uptodate device for slot 6 of /dev/md124
mdadm: added /dev/md/beta to /dev/md124 as 0
mdadm: /dev/md124 assembled from 2 drives - not enough to start the array.
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [raid1] [raid10] [raid0]
[linear] [multipath]
md124 : inactive md125[3](S) md127[1](S) md126[0](S)
6837155192 blocks super 1.2
md0 : active raid1 sda5[0] sdb2[1]
107652416 blocks [2/2] [UU]
bitmap: 0/1 pages [0KB], 65536KB chunk
md125 : active raid1 sdh1[0] sdg1[1]
2930134016 blocks super 1.2 [2/2] [UU]
bitmap: 0/22 pages [0KB], 65536KB chunk
md126 : active raid1 sdc1[0] sdd1[1]
1953512312 blocks super 1.2 [2/2] [UU]
md127 : active raid1 sde1[2] sdf1[1]
1953512312 blocks super 1.2 [2/2] [UU]
unused devices: <none>
# mdadm --examine /dev/md/alpha
/dev/md/alpha:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 1f4979ba:c49a77c0:59e689c2:bcc21c0a
Name : hordern:hordern1 (local to host hordern)
Creation Time : Fri Jan 2 09:59:40 2009
Raid Level : raid4
Raid Devices : 4
Avail Dev Size : 3907021824 (1863.01 GiB 2000.40 GB)
Array Size : 5860532736 (5589.04 GiB 6001.19 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=752 sectors
State : active
Device UUID : 63aaa2e4:2a09f495:8372c7f9:eb2f2773
Reshape pos'n : 129067008 (123.09 GiB 132.16 GB)
Delta Devices : 1 (3->4)
Update Time : Sun Mar 29 15:11:35 2015
Checksum : 8be5e0e8 - correct
Events : 14013
Chunk Size : 512K
Device Role : Active device 1
Array State : AA.. ('A' == active, '.' == missing, 'R' == replacing)
# mdadm --examine /dev/md/beta
/dev/md/beta:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x4
Array UUID : 1f4979ba:c49a77c0:59e689c2:bcc21c0a
Name : hordern:hordern1 (local to host hordern)
Creation Time : Fri Jan 2 09:59:40 2009
Raid Level : raid4
Raid Devices : 4
Avail Dev Size : 3907022576 (1863.01 GiB 2000.40 GB)
Array Size : 5860532736 (5589.04 GiB 6001.19 GB)
Used Dev Size : 3907021824 (1863.01 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=752 sectors
State : clean
Device UUID : 6e6dce14:3ebb2bb5:187aa292:403a55f6
Reshape pos'n : 129067008 (123.09 GiB 132.16 GB)
Delta Devices : 1 (3->4)
Update Time : Sun Mar 29 15:11:35 2015
Checksum : f7526adf - correct
Events : 14013
Chunk Size : 512K
Device Role : Active device 0
Array State : AA.. ('A' == active, '.' == missing, 'R' == replacing)
# mdadm --examine /dev/md/gamma
/dev/md/gamma:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x6
Array UUID : 1f4979ba:c49a77c0:59e689c2:bcc21c0a
Name : hordern:hordern1 (local to host hordern)
Creation Time : Fri Jan 2 09:59:40 2009
Raid Level : raid4
Raid Devices : 4
Avail Dev Size : 5860265984 (2794.39 GiB 3000.46 GB)
Array Size : 5860532736 (5589.04 GiB 6001.19 GB)
Used Dev Size : 3907021824 (1863.01 GiB 2000.40 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Recovery Offset : 86403072 sectors
Unused Space : before=1960 sectors, after=1953244160 sectors
State : active
Device UUID : 782873ea:e265ecd4:5cc80ddf:035ba2b4
Reshape pos'n : 129067008 (123.09 GiB 132.16 GB)
Delta Devices : 1 (3->4)
Update Time : Sun Mar 29 00:05:29 2015
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : 710dc078 - correct
Events : 673
Chunk Size : 512K
Device Role : Active device 2
Array State : AAA. ('A' == active, '.' == missing, 'R' == replacing)
# mdadm --detail /dev/md124
/dev/md124:
Version : 1.2
Raid Level : raid0
Total Devices : 3
Persistence : Superblock is persistent
State : inactive
Delta Devices : 1, (-1->0)
New Level : raid4
New Chunksize : 512K
Name : hordern:hordern1 (local to host hordern)
UUID : 1f4979ba:c49a77c0:59e689c2:bcc21c0a
Events : 673
Number Major Minor RaidDevice
- 9 125 - /dev/md/gamma
- 9 126 - /dev/md/beta
- 9 127 - /dev/md/alpha
So it looks like all three component devices have consistent
superblocks now, awesome! But the raid0 array is still inactive with
all three components listed as spares. It looks like /dev/md/gamma has
a much lower event count, I'm guessing that is what causes the disk to
be marked as possibly out of date.
Is an "uptodate device" a specific thing, or does that simply mean
that some component devices are out of date? The lack of spaces makes
me think that uptodate is some keyword I'm not recognizing.
--
Jonathan
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