Show Menu
Cheatography
  1. Home >
  2. Software >

LFCS_Module5_StorageManagement Cheat Sheet by

MBR vs GPT

BIOS
UEFI
<2TB
>2TB
max 4 partitions
max 128 partitions
Beyond 4: extended, logical partition
All 128 are Primary
fdisk utility
gdisk utility

Creating partition

cat /proc/­par­tit­iions
List current partitions
fdisk /dev/sdb
Create MBR partition on /dev/sdb
gdisk /dev/sdb
Create GPT partition on /dev/sdc

Create File Systems

mkfs.ext4 -b 1024 -L myfs /dev/sdb1
Create ext4 file system w/ myfs label (-L) and 1024Mb size (-b)
mount /dev/sdb1 /mnt; umount /mnt
Mount /dev/sdb1 on /mnt; unmount
mkfs.xfs -L XFSFS /dev/sdb5
Create xfs file system
mount LABEL=­XFSFS /mnt
Mount
mkfs.btrfs -L butter /dev/sdc1
Create btrfs file system

Mount partitions w/ etc fstab

vim /etc/fstab
/dev/sdb1 /ext4 ext4 defaults 0 0
LABEL=­XFSFS
Mount by label
mount -a
Mount everything specified in fstab
 

Create RAID

gdisk disk; fd00; partprobe
Create RAID disks
mdadm --create /dev/md0 --level=1 --raid­-di­sks=2 /dev/sdd2 /dev/sde1
Create RAID level 1 from 2 RAID disk
mffs.ext4 /dev/md0
Create file system on RAID
mdadm --detail --scan >> /etc/m­dad­m.conf
Write the RAID config
mkdir /raid; mount /dev/md0 /raid
Mount RAID to /raid
vim /etc/f­stab;
Mount persis­tently
cat /proc/­mdstat
Check the RAID if operat­ional
mdadm --detail /dev/md0
More info about the RAID

Swap Partition

partprobe
mkswap /dev/sdb6
Create swap file system on /dev/sdb6
free -m
Show current swap
swapon /dev/sdb6
Turn swap on
/etc/fstab
Mounting automa­tically
swapon -a

Configure Encrypted Partitions

fdisk /dev/sdb; n; l; w; partprobe
Create the partition
cryptsetup luksFormat /dev/sdb7; YES; pass;
Create encrypted device
cryptsetup luksOpen /dev/sdb7 secret
Open the encrypted partiton to create file system
mffs.ext4 /dev/m­app­er/­secret
Create file system on encrypted device
mount /dev/m­app­er/­secret /mnt
Mount the device
vim /etc/c­ryp­ttab; secret /dev/sdb8
/dev/m­app­er/­secret /secret ext4 noauto 0 0
 

Create LVM

gdisk /dev/sdc; 8e00; w; y; partprobe
Create partition for LVM
pvcreate /dev/sdc4
Create physical volume
vgcreate vgdata /dev/sdc4
Put physical volume in volume group
lvcreate -L 1G -n lvdata vgdata
Create logical volume
lvs
Show current LV
vgs
Show current volume group
pvs
Show current physical volume

LVM volume naming

/dev/m­apper; ls -l
List device mapper
/dev/v­gdata; ls -l
//

Mount LVM persis­tently

/dev/m­app­er/­vgd­ata­-lvdata /lvmou­ntpoint ext4 defaults 0 0
Mount in fstab
dmesg | tail
See errors

File System Label & UUID

tune2fs -L lvdata /dev/v­dga­ta/­lvdata
Change volume label
blkid
Show UUID for all current file system
etc/fs­tab/; UUID="...."­
Mount it

LVM Resize

df -h
Show file system info
gdisk /dev/sdc; partprobe /dev/sdc
Create another partition
vgextend *volumne group name /dev/sdc5
Extend the volume group
lvextend -l +100%FREE -r /dev/v­gda­ta/­lvdata
Resize LVM to take 100% free storage

Recover after disk failure

mdadm --create /dev/md0 -l 5 -x 1 /dev/sdb /dev/sdc /dev/sdd /dev/sde
Create RAID md0 level 5 w/ 1 hot spare (-x)
mdadm --fail /dev/md0 /dev/sdb
Fail a device
mdadm --remove /dev/md0 /dev/sdb
Remove the device from RAID array
mdadm -- /dev/md0 /dev/sde
Add new device to RAID array

Help Us Go Positive!

We offset our carbon usage with Ecologi. Click the link below to help us!

We offset our carbon footprint via Ecologi
 

Metadata

  • Languages:
  • Published: 27th September, 2018

Comments

No comments yet. Add yours below!

Add a Comment

Your Comment

Please enter your name.

    Please enter your email address

      Please enter your Comment.

          Related Cheat Sheets

          Linux Command Line Cheat Sheet
          mod_rewrite Cheat Sheet
          Vim NERDTree Cheat Sheet

          More Cheat Sheets by nhatlong0605