Mdadm centos

mdadm centos

Задача - добавили новый винт и надо переехать на рейд
Размечаем так как есть:

sfdisk -d /dev/sda | sfdisk /dev/sdb --force
Checking that no-one is using this disk right now ...
OK

Disk /dev/sdb: 38913 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdb1          0       -       0          0    0  Empty
/dev/sdb2          0       -       0          0    0  Empty
/dev/sdb3          0       -       0          0    0  Empty
/dev/sdb4          0       -       0          0    0  Empty
New situation:
Units = sectors of 512 bytes, counting from 0

   Device Boot    Start       End   #sectors  Id  System
/dev/sdb1   *      2048    411647     409600  83  Linux
/dev/sdb2        411648  12699647   12288000  82  Linux swap / Solaris
/dev/sdb3      12699648 625141759  612442112  83  Linux
/dev/sdb4             0         -          0   0  Empty

mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sdb1 missing
mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sdb3 missing

mkfs.ext4 /dev/md0
mkfs.ext4 /dev/md1

Не забыть установить тип партиции fd для всех разделов в рейде

fdisk /dev/sdb
t
Partition number (1-4): 3
Hex code (type L to list codes): fd
Changed system type of partition 3 to fd (Linux raid autodetect)

blkid
/dev/sda1: UUID="dc25921e-8263-4347-8b4e-f7e1e49d9bf5" TYPE="ext4"
/dev/sda2: UUID="a01dd47f-5c61-4770-a4f0-0f8e19c068b5" TYPE="swap"
/dev/sda3: UUID="102984a0-3cd6-43ab-b4bf-47029828a7cb" TYPE="ext4"
/dev/sdb1: UUID="58fb76b9-0552-8a81-31d6-4d7265470739" TYPE="linux_raid_member"
/dev/sdb3: UUID="cf3c8070-443d-8937-6cc8-3ea9197c784a" UUID_SUB="0425635a-21d3-7eae-3015-066254fca5fb" LABEL="impexmedia.net:1" TYPE="linux_raid_member"
/dev/md127: UUID="ad41081b-3dab-458c-bbe1-b1895365d1a4" TYPE="ext4"
/dev/md126: UUID="35036373-4d27-492c-8753-9c62bbd2f789" TYPE="ext4"