I am having trouble going from a single disk to raid 10
The command issued is:
mdadm --create /dev/md0 --level=10 --raid-devices=8 /dev/sd[abcdefgh]1
The output is:
mdadm mdadm: cannot open /dev/sda1: Device or resource busy
I have verified this has nothing to do with DM:
]# dmsetup status
No devices found
The file system is GPT, I used sgdisk --backup=table /dev/sda follwoed by sgdisk --load-backup=table /dev/sdb through to sdh to copy the partitions table
the table looks like:
Number Start End Size File system Name Flags
1 1049kB 525MB 524MB ext3 boot
2 525MB 86.4GB 85.9GB ext4
3 86.4GB 90.7GB 4295MB linux-swap(v1)
4 90.7GB 1000GB 909GB
I have created the other arrays fine however I cannot create the raid for the 1st and 2nd partition.
current status:
]# cat /proc/mdstat
Personalities : [raid10]
md3 : active raid10 sdh3[7] sdg3[6] sdf3[5] sde3[4] sdd3[3] sdc3[2] sdb3[1] sda3[0]
16766976 blocks super 1.2 512K chunks 2 near-copies [8/8] [UUUUUUUU]
resync=DELAYED
md4 : active raid10 sdh4[7] sdg4[6] sdf4[5] sde4[4] sdd4[3] sdc4[2] sdb4[1] sda4[0]
3552147456 blocks super 1.2 512K chunks 2 near-copies [8/8] [UUUUUUUU]
[========>............] resync = 42.5% (1513033344/3552147456) finish=76.2min speed=445722K/sec
unused devices:
Can anyone offer any advice, do I need to boot in to a rescue disk and create the arrays for / and /boot while they are not mounted?
Answer
do I need to
...create the arrays for / and /boot while they are not mounted?
Precisely.
I hope you also realised that the old contents will be wiped in the process, so you might want to create a new array with one device missing (use mdadm --level=10 --raid-devices=8 --missing /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1). Then format the filesystem on the new array volume and copy all data from /dev/sda1 to it. Then reboot from the array (thus NOT using the /dev/sda1 root) and actually add /dev/sda1.
Do not forget to adjust the bootloader accordingly.
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