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How to list block devices in Redhat or Centos to identify hard disk devices
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lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 49G 0 part
├─cl-root 253:0 0 47G 0 lvm /
└─cl-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 50G 0 disk
sr0 11:0 1 56.7M 0 rom
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