On 1/4/2018 1:16 PM, Brad Campbell wrote:>
Damn. I saw your initial mail, but I was out and nowhere near a device I
could use to reply sensibly.
You should *really* check by looking at the mdadm --examine output and
calculating the position of the sectors in question to be absolutely
sure the area you just wrote over was not in the active array area. If
it was then you should stop the checkarray *now* and come back for advice.
Thanks Brad, no worries, really appreciate your attention. I stopped
checkarray. It had one rebuild event (Rebuild99) in /dev/md0 (small
RAID1, where /boot is mounted) before I stopped it. Here's the examine
output (not really sure what to do with it, will wait for advice):
user@machinename:~$ sudo mdadm --examine /dev/sd*
/dev/sda:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sda1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 437e4abb:c7ac46f1:ef8b2976:94921060
Name : arrayname:0
Creation Time : Mon Dec 7 08:31:31 2015
Raid Level : raid1
Raid Devices : 4
Avail Dev Size : 3901440 (1905.32 MiB 1997.54 MB)
Array Size : 1950656 (1905.26 MiB 1997.47 MB)
Used Dev Size : 3901312 (1905.26 MiB 1997.47 MB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 9cb1890b:ad675b3b:7517467f:0780ec8e
Update Time : Thu Jan 4 12:00:45 2018
Checksum : 682930c3 - correct
Events : 215
Device Role : Active device 0
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sda2.
/dev/sda3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : c7303f62:d848d424:269581c8:83a045ec
Name : ubuntu:2
Creation Time : Sun Feb 5 23:39:58 2017
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5840377856 (2784.91 GiB 2990.27 GB)
Array Size : 8760566784 (8354.73 GiB 8970.82 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 64c8db38:3d0a6895:be2259d8:4c3c3542
Internal Bitmap : 8 sectors from superblock
Update Time : Thu Jan 4 13:34:53 2018
Checksum : d9775efa - correct
Events : 81186
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sda4.
/dev/sdb:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 437e4abb:c7ac46f1:ef8b2976:94921060
Name : arrayname:0
Creation Time : Mon Dec 7 08:31:31 2015
Raid Level : raid1
Raid Devices : 4
Avail Dev Size : 3901440 (1905.32 MiB 1997.54 MB)
Array Size : 1950656 (1905.26 MiB 1997.47 MB)
Used Dev Size : 3901312 (1905.26 MiB 1997.47 MB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 38999554:d1b0db8d:d8066e72:86865c31
Update Time : Thu Jan 4 12:00:45 2018
Checksum : 995557b1 - correct
Events : 215
Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sdb2.
/dev/sdb3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : c7303f62:d848d424:269581c8:83a045ec
Name : ubuntu:2
Creation Time : Sun Feb 5 23:39:58 2017
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5840377856 (2784.91 GiB 2990.27 GB)
Array Size : 8760566784 (8354.73 GiB 8970.82 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : cf70dad5:0c9ff5f6:ede689f2:ccee2eb0
Internal Bitmap : 8 sectors from superblock
Update Time : Thu Jan 4 13:34:53 2018
Checksum : 602e12e9 - correct
Events : 81186
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sdb4.
/dev/sdc:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 437e4abb:c7ac46f1:ef8b2976:94921060
Name : arrayname:0
Creation Time : Mon Dec 7 08:31:31 2015
Raid Level : raid1
Raid Devices : 4
Avail Dev Size : 3901440 (1905.32 MiB 1997.54 MB)
Array Size : 1950656 (1905.26 MiB 1997.47 MB)
Used Dev Size : 3901312 (1905.26 MiB 1997.47 MB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f162eae5:19f8926b:f5bb6a2a:8adbbefd
Update Time : Thu Jan 4 12:00:45 2018
Checksum : 8cb8728a - correct
Events : 215
Device Role : Active device 3
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sdc2.
/dev/sdc3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : c7303f62:d848d424:269581c8:83a045ec
Name : ubuntu:2
Creation Time : Sun Feb 5 23:39:58 2017
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5840377856 (2784.91 GiB 2990.27 GB)
Array Size : 8760566784 (8354.73 GiB 8970.82 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f8839952:eaba2e9c:c2c401d4:3e0592a5
Internal Bitmap : 8 sectors from superblock
Update Time : Thu Jan 4 13:34:53 2018
Checksum : 59013634 - correct
Events : 81186
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sdc4.
/dev/sdd:
MBR Magic : aa55
Partition[0] : 4294967295 sectors at 1 (type ee)
/dev/sdd1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 437e4abb:c7ac46f1:ef8b2976:94921060
Name : arrayname:0
Creation Time : Mon Dec 7 08:31:31 2015
Raid Level : raid1
Raid Devices : 4
Avail Dev Size : 3901440 (1905.32 MiB 1997.54 MB)
Array Size : 1950656 (1905.26 MiB 1997.47 MB)
Used Dev Size : 3901312 (1905.26 MiB 1997.47 MB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 4823f0b8:8e0d3ac3:e312c219:29f76622
Update Time : Thu Jan 4 12:00:45 2018
Checksum : cb64bae5 - correct
Events : 215
Device Role : Active device 1
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sdd2.
/dev/sdd3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : c7303f62:d848d424:269581c8:83a045ec
Name : ubuntu:2
Creation Time : Sun Feb 5 23:39:58 2017
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 5840377856 (2784.91 GiB 2990.27 GB)
Array Size : 8760566784 (8354.73 GiB 8970.82 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 875a0dbd:965a9986:1b78eb3d:e15fee50
Internal Bitmap : 8 sectors from superblock
Update Time : Thu Jan 4 13:34:53 2018
Checksum : c325ba6d - correct
Events : 81186
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 3
Array State : AAAA ('A' == active, '.' == missing)
mdadm: No md superblock detected on /dev/sdd4.
Here's mdadm --detail if needed:
user@machinename:~$ sudo mdadm --detail /dev/md2
/dev/md2:
Version : 1.2
Creation Time : Sun Feb 5 23:39:58 2017
Raid Level : raid5
Array Size : 8760566784 (8354.73 GiB 8970.82 GB)
Used Dev Size : 2920188928 (2784.91 GiB 2990.27 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Thu Jan 4 13:31:21 2018
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : ubuntu:2
UUID : c7303f62:d848d424:269581c8:83a045ec
Events : 81186
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
4 8 19 1 active sync /dev/sdb3
2 8 35 2 active sync /dev/sdc3
5 8 51 3 active sync /dev/sdd3
user@machinename:~$ sudo mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Mon Dec 7 08:31:31 2015
Raid Level : raid1
Array Size : 1950656 (1905.26 MiB 1997.47 MB)
Used Dev Size : 1950656 (1905.26 MiB 1997.47 MB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Thu Jan 4 12:00:45 2018
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Name : arrayname:0
UUID : 437e4abb:c7ac46f1:ef8b2976:94921060
Events : 215
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
5 8 49 1 active sync /dev/sdd1
4 8 17 2 active sync /dev/sdb1
2 8 33 3 active sync /dev/sdc1
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
