🗿 Partition

# check partion 
parted -l /dev/sda
fdisk -l 

# check partition - visible before the mkfs
ls /sys/sda/sda*    
ls /dev/sd* 

# give partition after the mkfs or pvcreate
blkid
blkid -o list

# summary about the disks, partitions, FS and LVM 
lsblk   
lsblk -f

# with fdisk 
printf "n\np\n1\n\n\nt\n8e\nw\n" | sudo fdisk "/dev/sdb"

# with parted
sudo parted /dev/sdb mklabel gpt mkpart primary 1 100% set 1 lvm on

# [RHEL6]   
partx -a /dev/sda

# [RHEL6/7] 
partprobe

# [RHEL7]  
partx -u /dev/sdq
kpartx -u /dev/sdq

# [RHEL8]   
udevadm settle

# [Manual] 
for x in /sys/class/scsi_disk/*; do echo '1' > $x/device/rescan; done
for BUS in /sys/class/scsi_host/host*/scan; do    echo "- - -" >  ${BUS}; done

# same as above with sudo 
sudo sh -c 'for x in /sys/class/scsi_disk/*; do echo "1" > $x/device/rescan; done'
sudo sh -c 'for BUS in /sys/class/scsi_host/host*/scan; do  echo "- - -" >  ${BUS} ; done '

wipe -a /dev/sda3
wipefs -a  /dev/sd[c-z] 

# in RHEL 5
shred -n 5 -vz /dev/sdb 

# check; the following should return nothing 
wipefs /dev/sd[c-z]  

# old school way
dd if=/dev/urandom of=/dev/sdX bs=4k
dd if=/dev/zero of=/dev/sdp1 bs=512 count=10 

# When you like to do several disks at once... 
umount /dev/cciss/c0d{1..6}p1
for i in {1..6}; do parted -s /dev/cciss/c0d${i} rm 1 ; done
for i in {1..6}; do echo "nohup sh -c \"shred -vfz -n 3 /dev/cciss/c0d${i} > nohup${i}.out 2>&1 \" &" ; done | bash