Mdadm

Software raid management under linux.

1. look at healt of mirror.

mdadm --detail /dev/md127

1. reattach device to raid device.

mdadm --manage /dev/md126 --re-add /dev/vdb1

1. Add partition to raid device.

mdadm /dev/md127 --add /dev/vdb2

1. Remove disk from raid device.

mdadm --manage /dev/md0 --fail /dev/sdc
mdadm --manage /dev/md3 --remove /dev/vdd2

1. If disk has been part of raid then wipe it.

mdadm --zero-superblock /dev/sdb3

1. Create raid device.

mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/sda2 /dev/sdb2

1. Create raid1 with one initial disk.

mdadm --create /dev/md1 --level=1 --raid-devices=2 missing /dev/vdd1

Remove raid device.

1. Deactivate raid device.

mdadm --stop /dev/md2

1. Once deactivated, remove the RAID device itself:

mdadm --remove /dev/md2

1. Finally, zero superblocks on all devices that were associated with the particular array:

mdadm --zero-superblock /dev/md2

force sync disks

mdadm --readwrite /dev/md127

sgdisk

1. Whiping partition.

sgdisk -oz /dev/sda

1. copy non gpt disk layout.

sfdisk -d /dev/vda | sfdisk /dev/vdb

1. Copy partition layout.

sgdisk --replicate=/dev/target /dev/source

1. Create a new UID

sgdisk -G /dev/target

1. Information about disk.

gdisk -l /dev/sda

Create partition to build mirrors on

sudo gdisk /dev/sdf
n
FD00
sudo gdisk -l /dev/sdf
Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048      7814037134   3.6 TiB     FD00  Linux RAID