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WiseDraco 03-17-2014 06:54 AM

Try to clone software RAID1 - problems
i try to clone my software raid system based on two discs - slackware64 14.1
there is thre partitions - /sda1 | sdb1 as / and as md1
sda2 | sdb2 as swap and md2
sda3 | sdb3 as /secondary and md3

my idea to clone that raid system with all data is add to system third physical disc ( sdc), boot up system, and do:

sfdisk -d /dev/sda |sfdisk /dev/sdc : done, ok. partition table copied.

now i try to do
mdadm /dev/md1 --add /dev/sdc1 : there i got problem - got message
mdadm: Cannot open /dev/sdc1: device or resource busy

it is even not mounted. any ideas?

PS after that i plan to do mdadm -G /dev/md1 -n3 , wait to finish syncing, and then mdadm -f /dev/sdc1 and mdadm -r /dev/sdc1.
after that, i hope, i can put that removed sdc disk as primary in new system, boot from it, add new disk, syncing, and get working copy of my first RAID1...?

smallpond 03-17-2014 09:50 AM

The kernel only knows about the new partition table if you reboot, or force it to reread the disk with:

blockdev --rereadpt /dev/sdc

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