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