Create RAID 1 – Mirroring

Create RAID 1 – Mirroring

# fdisk /dev/hda

The number of cylinders for this disk is set to 2534.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): n
First cylinder (1590-2534, default 1590):
Using default value 1590
Last cylinder or +size or +sizeM or +sizeK (1590-2534, default 2534): +500M

Command (m for help): t
Partition number (1-9): 9
Hex code (type L to list codes): fd
Changed system type of partition 9 to fd (Linux raid autodetect)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.


# fdisk /dev/hdd

The number of cylinders for this disk is set to 3736.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): n
First cylinder (376-3736, default 376):
Using default value 376
Last cylinder or +size or +sizeM or +sizeK (376-3736, default 3736): +500M

Command (m for help): t
Partition number (1-7): 7
Hex code (type L to list codes): fd
Changed system type of partition 7 to fd (Linux raid autodetect)

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.

If you have already created a /dev/md0 you will need to create the device /dev/md1 with this command:

mknod /dev/md1 b 9 2

# mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/hda9 /dev/hdd7
mdadm: array /dev/md1 started.

# mke2fs -j /dev/md1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
124928 inodes, 497856 blocks
24892 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67633152
61 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 37 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

# mkdir /rd
# mount /dev/md1 /rd

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