🗿 Partition

 1# check partion 
 2parted -l /dev/sda
 3fdisk -l 
 4
 5# check partition - visible before the mkfs
 6ls /sys/sda/sda*    
 7ls /dev/sd* 
 8
 9# give partition after the mkfs or pvcreate
10blkid
11blkid -o list
12
13# summary about the disks, partitions, FS and LVM 
14lsblk   
15lsblk -f

1# with fdisk 
2printf "n\np\n1\n\n\nt\n8e\nw\n" | sudo fdisk "/dev/sdb"
3
4# with parted
5sudo parted /dev/sdb mklabel gpt mkpart primary 1 100% set 1 lvm on

 1# [RHEL6]   
 2partx -a /dev/sda
 3
 4# [RHEL6/7] 
 5partprobe
 6
 7# [RHEL7]  
 8partx -u /dev/sdq
 9kpartx -u /dev/sdq
10
11# [RHEL8]   
12udevadm settle
13
14# [Manual] 
15for x in /sys/class/scsi_disk/*; do echo '1' > $x/device/rescan; done
16for BUS in /sys/class/scsi_host/host*/scan; do    echo "- - -" >  ${BUS}; done
17
18# same as above with sudo 
19sudo sh -c 'for x in /sys/class/scsi_disk/*; do echo "1" > $x/device/rescan; done'
20sudo sh -c 'for BUS in /sys/class/scsi_host/host*/scan; do  echo "- - -" >  ${BUS} ; done '

 1wipe -a /dev/sda3
 2wipefs -a  /dev/sd[c-z] 
 3
 4# in RHEL 5
 5shred -n 5 -vz /dev/sdb 
 6
 7# check; the following should return nothing 
 8wipefs /dev/sd[c-z]  
 9
10# old school way
11dd if=/dev/urandom of=/dev/sdX bs=4k
12dd if=/dev/zero of=/dev/sdp1 bs=512 count=10 
13
14# When you like to do several disks at once... 
15umount /dev/cciss/c0d{1..6}p1
16for i in {1..6}; do parted -s /dev/cciss/c0d${i} rm 1 ; done
17for i in {1..6}; do echo "nohup sh -c \"shred -vfz -n 3 /dev/cciss/c0d${i} > nohup${i}.out 2>&1 \" &" ; done | bash