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Lab 17.1 Creating Software Raid - mdadm: RUN_ARRAY failed: Invalid argument
ultraninja
Posts: 20
I'm using the LFS Ubuntu 14.1 lab VM.
Basically, I added an additional 1GB virtual drive to the VM in Virtualbox. Partitioned it with fdisk.
pvcreate /dev/sdb1
vgcreate VG /dev/sdb1
lvcreate -L 200M -n MD1 VG
lvcreate -L 200M -n MD2 VG
root@ubuntu:/home/student# lvdisplay
--- Logical volume ---
LV Path /dev/VG/MD1
LV Name MD1
VG Name VG
LV UUID BVR2X8-jltC-MCSd-WulR-2IXQ-uc7c-6SEjvr
LV Write Access read/write
LV Creation host, time ubuntu, 2015-12-28 15:16:00 -0600
LV Status available
# open 0
LV Size 200.00 MiB
Current LE 50
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
--- Logical volume ---
LV Path /dev/VG/MD2
LV Name MD2
VG Name VG
LV UUID A8P9JO-RKwK-XlUB-Ifw7-mrtI-yfFO-zV3lQY
LV Write Access read/write
LV Creation host, time ubuntu, 2015-12-28 15:16:03 -0600
LV Status available
# open 0
LV Size 200.00 MiB
Current LE 50
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
root@ubuntu:/home/student# mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/VG/MD1 /dev/VG/MD2
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: size set to 204608K
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: RUN_ARRAY failed: Invalid argument
root@ubuntu:/home/student# cat /proc/mdstat
Personalities :
unused devices: <none>
--- Logical volume ---
LV Path /dev/VG/MD1
LV Name MD1
VG Name VG
LV UUID BVR2X8-jltC-MCSd-WulR-2IXQ-uc7c-6SEjvr
LV Write Access read/write
LV Creation host, time ubuntu, 2015-12-28 15:16:00 -0600
LV Status available
# open 0
LV Size 200.00 MiB
Current LE 50
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
--- Logical volume ---
LV Path /dev/VG/MD2
LV Name MD2
VG Name VG
LV UUID A8P9JO-RKwK-XlUB-Ifw7-mrtI-yfFO-zV3lQY
LV Write Access read/write
LV Creation host, time ubuntu, 2015-12-28 15:16:03 -0600
LV Status available
# open 0
LV Size 200.00 MiB
Current LE 50
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
root@ubuntu:/home/student# mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/VG/MD1 /dev/VG/MD2
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: size set to 204608K
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: RUN_ARRAY failed: Invalid argument
root@ubuntu:/home/student# cat /proc/mdstat
Personalities :
unused devices: <none>
I've also tried adding 2x 1GB virtual disks in Virtualbox, then trying to create a raid array with those 2 disks. Same error "mdadm: RUN_ARRAY failed: Invalid argument"
After battling with this for a few hours, reading man pages, and googling, I'm still getting the error.
0
Comments
-
What kernel are you running? If you are running the custom kernel on the LF VM,
it is likely not configured for RAID properly; it is intended for *this course* that you use the stock distro kernel. (the custom kernels are for use in kernel devel courses)
Check uname -r ; if it is reporting 4.3.0 or whatever, you are probably toast.
If you are using the Ubuntu stock kernel (choose at boot time) you should be ok.
Check if CONFIG_MD_RAID* is set (look at /boot/config*)
If this is not the problem, let us know/0 -
Thanks for the reply. Yup, it was the kernel. I just installed the generic kernel from the repositories. I have 2 remaining questions:
1) How can I check if RAID is supported in a booted kernel?- root@ubuntu:/boot# grep RAID config-`uname -r`
- CONFIG_RAID_ATTRS=m
- CONFIG_BLK_DEV_3W_XXXX_RAID=m
- CONFIG_SCSI_AACRAID=m
- CONFIG_MEGARAID_NEWGEN=y
- CONFIG_MEGARAID_MM=m
- CONFIG_MEGARAID_MAILBOX=m
- CONFIG_MEGARAID_LEGACY=m
- CONFIG_MEGARAID_SAS=m
- CONFIG_SCSI_PMCRAID=m
- CONFIG_MD_RAID0=m
- CONFIG_MD_RAID1=m
- CONFIG_MD_RAID10=m
- CONFIG_MD_RAID456=m
- CONFIG_DM_RAID=m
- CONFIG_DMA_ENGINE_RAID=y
- CONFIG_ASYNC_RAID6_TEST=m
- CONFIG_ASYNC_RAID6_RECOV=m
- CONFIG_RAID6_PQ=m
- root@ubuntu:/boot# grep RAID config-4.2.0
- # CONFIG_RAID_ATTRS is not set
- # CONFIG_BLK_DEV_3W_XXXX_RAID is not set
- # CONFIG_SCSI_AACRAID is not set
- # CONFIG_MEGARAID_NEWGEN is not set
- # CONFIG_MEGARAID_LEGACY is not set
- # CONFIG_MEGARAID_SAS is not set
- # CONFIG_SCSI_PMCRAID is not set
- # CONFIG_MD_RAID0 is not set
- # CONFIG_MD_RAID1 is not set
- # CONFIG_MD_RAID10 is not set
- # CONFIG_MD_RAID456 is not set
- # CONFIG_DM_RAID is not set
- CONFIG_RAID6_PQ=m
I'm assuming the "is not set" values indicate the kernel wasn't compiled with RAID support on the 4.2 kernel. Oh, and the # commented out RAID lines.
2) I created the raid array with mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/sda3 /dev/sda4 yet when I check the array it's actually /dev/md127. I'm not sure why its md127 rather than md0. Maybe my mdadm.conf isn't correct.- student@ubuntu:~$ sudo fdisk -l
- Disk /dev/sda: 42.9 GB, 42949672960 bytes
- 255 heads, 63 sectors/track, 5221 cylinders, total 83886080 sectors
- Units = sectors of 1 * 512 = 512 bytes
- Sector size (logical/physical): 512 bytes / 512 bytes
- I/O size (minimum/optimal): 512 bytes / 512 bytes
- Disk identifier: 0x000045d1
- Device Boot Start End Blocks Id System
- /dev/sda1 * 2048 37750783 18874368 83 Linux
- /dev/sda2 37752830 41940991 2094081 5 Extended
- /dev/sda3 41940992 42350591 204800 83 Linux
- /dev/sda4 42350592 42760191 204800 83 Linux
- /dev/sda5 37752832 41940991 2094080 82 Linux swap / Solaris
- Disk /dev/md127: 209 MB, 209518592 bytes
- 2 heads, 4 sectors/track, 51152 cylinders, total 409216 sectors
- Units = sectors of 1 * 512 = 512 bytes
- Sector size (logical/physical): 512 bytes / 512 bytes
- I/O size (minimum/optimal): 512 bytes / 512 bytes
- Disk identifier: 0x00000000
- Disk /dev/md127 doesn't contain a valid partition table
- root@ubuntu:/home/student# cat /proc/mdstat
- Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
- md127 : active (auto-read-only) raid1 sda3[0] sda4[1]
- 204608 blocks super 1.2 [2/2] [UU]
- unused devices: <none>
Thanks for the help0 -
Hi,
You can check if the md support is included in the kernel config file. So just do:
grep _MD_ /boot/config-`uname -r`
It uses to be included as modules.
Happy new year!
Luis.0 -
The reason I was getting /dev/md127 rather than /dev/md0:
Ubuntu Forums - RAID starting at md127 instead of md0
1: mdadm.conf needed to be edited to remove the --name directive.
For example:- ARRAY /dev/md0 UUID=e4665ceb:15f8e4b6:b186d497:7d365254
2: You need to update initramfs so it contains your mdadm.conf settings during boot.- sudo update-initramfs -u
Looks good now:- root@LFS-VirtualBox:~# mdadm --detail /dev/md0
- /dev/md0:
- Version : 1.2
- Creation Time : Thu Jan 21 14:27:14 2016
- Raid Level : raid1
- Array Size : 204608 (199.85 MiB 209.52 MB)
- Used Dev Size : 204608 (199.85 MiB 209.52 MB)
- Raid Devices : 2
- Total Devices : 2
- Persistence : Superblock is persistent
- Update Time : Thu Jan 21 15:32:57 2016
- State : clean
- Active Devices : 2
- Working Devices : 2
- Failed Devices : 0
- Spare Devices : 0
- Name : LFS-VirtualBox:0 (local to host LFS-VirtualBox)
- UUID : 8b25d1ce:4b396710:01d76fec:b0ba507d
- Events : 32
- Number Major Minor RaidDevice State
- 0 8 17 0 active sync /dev/sdb1
- 1 8 18 1 active sync /dev/sdb2
- root@LFS-VirtualBox:~# cat /proc/mdstat
- Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
- md0 : active raid1 sdb2[1] sdb1[0]
- 204608 blocks super 1.2 [2/2] [UU]
- unused devices: <none>
0 -
I'm glad to know that you solved it!
Regards,
Luis.0
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