Setup Partitions

FDISK

• create partitions

RAID

• create raid1/mirror device

# mdadm --create /dev/md7 --level=1 --raid-devices=2 /dev/sdg1 /dev/sdh1

• for non bootable partition use v1.2

# mdadm --create /dev/md2 --metadata=1.2 --level=1 --raid-devices=2 /dev/sda5 /dev/sdb5

• for bootable partition use v0.90

# mdadm --create /dev/md0 --metadata=0.90 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1

• install grub in the master boot sector on both disks

# grub-install --force --no-floppy --root-directory=/mnt/target/ /dev/sda

# grub-install --force --no-floppy --root-directory=/mnt/target/ /dev/sdb

• chroot as described and install a device map followed by update initramfs and grub

# update-initramfs -u -k `uname -r`

# update-grub

• now system should be bootable from the raid disk

CRYPTSETUP

WARNING! The following command will remove all data on the partition that you are encrypting. You WILL lose all your information! So make sure you backup your data to an external source such as NAS or hard disk before typing any one of the following command.

In this example, I'm going to encrpt /dev/sdb7. Type the following command:

 # cryptsetup -y -v luksFormat /dev/sdb7

• Open the crypted device

 # cryptsetup luksOpen /dev/sdb7 backup

• Check the dm device

 # ls -l /dev/mapper/backup

or use following command

 # cryptsetup -v status backup

You can dump LUKS headers using the following command:

 # cryptsetup luksDump /dev/sdb7

• Close a dm device after unmounting it

 # cryptsetup luksClose backup

LVM setup

• Create physical volumes

 # pvcreate /dev/mapper/backup

• Create a volume group

 # vgcreate G750lvm /dev/mapper/backup

• After rebooting the system or running vgchange -an, you will not be able to access your VGs and LVs. To reactivate the volume group, run:

 # vgchange -a y G750lvm
       

• Creating a logical volume

 # lvcreate -L50G -nroot G750lvm

 # lvcreate -L150G -nhome G750lvm

 # lvcreate -L200G -ncustom G750lvm

 # lvcreate -L150G -ndata G750lvm

 # lvcreate -L2G -nswap1 G750lvm

 # lvcreate -L2G -nswap2 G750lvm

Format the volumes

 # mkfs.ext3 /dev/mapper/G750lvm-root

 # mkfs.ext3 /dev/mapper/G750lvm-home

 # mkfs.ext3 /dev/mapper/G750lvm-custom

 # mkfs.ext3 /dev/mapper/G750lvm-data

 # mkswap /dev/mapper/G750lvm-swap1

 # mkswap /dev/mapper/G750lvm-swap2

copy data

 cd /mnt
 test -d target || mkdir target
 test -d source || mkdir source

 # mount ...(source) /mnt/source
 # mount /dev/mapper/G750lvm-root /mnt/target

 # tar cf - . | (cd /mnt/target/; tar xvf -)

• umount and done

remove logical volume

• umount the partition

• close the volume

# lvchange -an /dev/vgcrypt/software

• remove the volume

# lvremove /dev/vgcrypt/software

Raid recovery

• Examine the partition table of the drive

 fdisk -l /dev/sdj
 
 Disk /dev/sdj: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
 Units: sectors of 1 * 512 = 512 bytes
 Sector size (logical/physical): 512 bytes / 512 bytes
 I/O size (minimum/optimal): 512 bytes / 512 bytes
 Disklabel type: dos
 Disk identifier: 0x000dda44
 
 Device     Boot     Start        End    Sectors   Size Id Type
 /dev/sdj1  *         2048     999423     997376   487M fd Linux raid autodetect
 /dev/sdj2          999424  157249535  156250112  74.5G fd Linux raid autodetect
 /dev/sdj3       157251582 1953523711 1796272130 856.5G  5 Extended
 /dev/sdj5       157251584  390647807  233396224 111.3G fd Linux raid autodetect
 /dev/sdj6       390649856  585959423  195309568  93.1G 83 Linux
 /dev/sdj7       585961472 1953523711 1367562240 652.1G 83 Linux

• (Optional) make backup of the partition table

 sfdisk -d /dev/sdX > partition_sdX.txt

• (Optional) Copy partition table to new drive

 sfdisk -d /dev/sdX | sfdisk /dev/sdY
 

• Examine the RAID table

 mdadm --examine /dev/sdj
 /dev/sdj:
    MBR Magic : aa55
 Partition[0] :       997376 sectors at         2048 (type fd)
 Partition[1] :    156250112 sectors at       999424 (type fd)
 Partition[2] :   1796272130 sectors at    157251582 (type 05)