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Hi all,
I tried to expand md block device raid level 0 ( /dev/md2 ) by adding another partition to it.
Here are the steps:
mdadm --assemble /dev/md2
mdadm: /dev/md2 has been started with 2 drives.
hanna64:~# mdadm --grow /dev/md2 --raid-devices=3 --add /dev/sdc2
mdadm: level of /dev/md2 changed to raid4
mdadm: added /dev/sdc2
mdadm: Need to backup 3072K of critical section..
Now fdisk -l cannot complete, just goes to D state.
Disks layout before the grow attempt:
ARRAY /dev/md2 metadata=1.2 name=hanna64:2 UUID=4840f7f0:71b5f4a0:c4d8a42c:0b43b5fb
/dev/sda2: UUID="4840f7f0-71b5-f4a0-c4d8-a42c0b43b5fb" TYPE="linux_raid_member" LABEL="hanna64:2"
UUID_SUB="cf97412f-269a-f3e8-fde2-8ca3bf42a349"
/dev/sdb2: UUID="4840f7f0-71b5-f4a0-c4d8-a42c0b43b5fb" TYPE="linux_raid_member" LABEL="hanna64:2"
UUID_SUB="9aee2d4c-6deb-911a-d790-cbd12f6c671c"
md2 : active raid0 sda2[0] sdb2[1]
15628288 blocks super 1.2 512k chunks
Disk /dev/md2: 16.0 GB, 16003366912 bytes
2 heads, 4 sectors/track, 3907072 cylinders, total 31256576 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disk identifier: 0x7b88c100
Disk /dev/md2 doesn't contain a valid partition table
This array was used as swap, so no valuable information is stored there anyways. Let me know what has gone wrong and
what I typed wrong assuming the grow command will just add /dev/sdc2 to the existing array and make it larger with the
size of /dev/sdc2.
Thank you,
- -Nikolay Kichukov
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