R.B. wiki

Использование parted для разметки диска

Instead of using a whole device for linux software RAID, use a partitioned device which mean the device has an easily read 'label'. This means I can determine that it is a RAID member disk (as a against a standalone disk) just by looking at the partition table. However it can introduce alignment issues, which are mitigated by starting the partion at offset 1MB.

Run parted as root to create a partition table and raid partition.

# parted -a optimal /dev/sdf

Create a legacy master boot record (MBR) partition table

(parted) **mklabel msdos **

Create a partition that is optimally alligned starts at 1MB into the disk (2048 sectors) and ends at the end of the disk (-1).

(parted) **mkpart** Partition type?  primary/extended? **primary** File system type?  [ext2]?
Start? **2048s** End? **-1**

Mark the partition as a software raid partition

(parted) set 1 raid on

Verify the partition is aligned

(parted) align-check alignment type(min/opt)  [optimal]/minimal? optimal Partition number? 1
1 aligned

Show the device

(parted) **print** Model: ATA WDC WD3202ABYS-0 (scsi)
Disk /dev/sdf: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End    Size   Type     File system  Flags
 1   1049kB  320GB  320GB  primary               raid

Add the device to the Linux software RAID volume:

# mdadm --add /dev/md1 /dev/sdf1