You're right I failed and removed device 3, then failed and removed
device 2, which broke my array.
Let's assume I haven't messed things up any more than I already have.
Is there a method to reverse the above operations for device 2 and device 3?
Thanks, Duane
On 2017-11-26 05:04 AM, Wols Lists wrote:
On 26/11/17 01:50, Duane wrote:
I have 3 RAID5 devices. When I assemble them, I end up with a RAID0 device.
What is the cause? What is the solution?
All I can think of is the fact that there is only 1 active device. I had
2 but then manually failed it. I want to reassemble a RAID5 array and
then re-add the second device.
OUCH!
Sorry. You have a 3-device raid-5. You only have 1 working device. Your
array is well broken.
You can't "reassemble raid5 then readd the second device". You need to
readd the second device in order to get your raid5 back. I'll let
someone else tell you how, but you need a MINIMUM of two devices to get
your raid working again. Then you need to get your third device added
back otherwise your raid 5 is broken.
DON'T DO ANYTHING WITHOUT ADVICE. I'm sorry, but your message says you
don't understand how raid works, and you are on the verge of destroying
your array irrevocably. It should be a simple recovery, *provided* you
don't make any mistakes.
Cheers,
Wol
mdadm -E /dev/sdc2 /dev/sdd /dev/sde
/dev/sdc2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Name : dave:0 (local to host dave)
Creation Time : Fri Oct 6 10:46:50 2017
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 7813726208 (3725.88 GiB 4000.63 GB)
Array Size : 7630592 (7.28 GiB 7.81 GB)
Used Dev Size : 7630592 (3.64 GiB 3.91 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=7806142351 sectors
State : clean
Device UUID : 0fe7e674:e1149499:7acb8853:c71fed62
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Nov 19 13:53:23 2017
Bad Block Log : 512 entries available at offset 24 sectors
Checksum : 79ee1226 - correct
Events : 51526
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 0
Array State : A.. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Name : dave:0 (local to host dave)
Creation Time : Fri Oct 6 10:46:50 2017
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 7813709489 (3725.87 GiB 4000.62 GB)
Array Size : 7630592 (7.28 GiB 7.81 GB)
Used Dev Size : 7630592 (3.64 GiB 3.91 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=7806078897 sectors
State : clean
Device UUID : ce2c8c03:f47f505b:c9a34e9a:668b70f5
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Nov 19 13:53:23 2017
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : a398c591 - correct
Events : 51526
Layout : left-symmetric
Chunk Size : 64K
Device Role : spare
Array State : A.. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Name : dave:0 (local to host dave)
Creation Time : Fri Oct 6 10:46:50 2017
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 7813709489 (3725.87 GiB 4000.62 GB)
Array Size : 7630592 (7.28 GiB 7.81 GB)
Used Dev Size : 7630592 (3.64 GiB 3.91 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=7806078897 sectors
State : clean
Device UUID : aecb9ce3:e7bc161f:9b8d1764:db815dde
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Nov 19 13:53:23 2017
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : fa2581ac - correct
Events : 51526
Layout : left-symmetric
Chunk Size : 64K
Device Role : spare
Array State : A.. ('A' == active, '.' == missing, 'R' == replacing)
mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Raid Level : raid0
Total Devices : 3
Persistence : Superblock is persistent
State : inactive
Name : dave:0 (local to host dave)
UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Events : 51526
Number Major Minor RaidDevice
- 8 64 - /dev/sde
- 8 34 - /dev/sdc2
- 8 48 - /dev/sdd
null
