Ways of searching a disk/hdd in RHEL6


  • There must be an entry in /sys/block/XXX
    • # ls -lrt /sys/block/
  • /proc/partitions ==> cat /proc/partitions 
    • major minor  #blocks  name
    •    8        0   15728640 sda
    •    8        1     512000 sda1
    •    8        2   15215616 sda2
    •    8       16    2097152 sdb
    •  253        0   13148160 dm-0
    •  253        1    2064384 dm-1
  • To list all the disk in the machine ==> fdisk -l
    • # fdisk -l /dev/?d?
      • To avoid all the dm devices.
    • # fdisk -l 2>/dev/null | grep "Disk \/"
      • Disk /dev/sda: 16.1 GB, 16106127360 bytes
      • Disk /dev/sdb: 2147 MB, 2147483648 bytes
      • Disk /dev/mapper/VolGroup-lv_root: 13.5 GB, 13463715840 bytes
      • Disk /dev/mapper/VolGroup-lv_swap: 2113 MB, 2113929216 bytes
  • # lsblk
    • NAME                        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
    • sda                               8:0                      0    15G    0 disk 
    • ├─sda1                        8:1                      0   500M  0 part   /boot
    • └─sda2                        8:2                      0  14.5G  0 part 
    •   ├─VolGroup-lv_root (dm-0) 253:0       0  12.6G  0 lvm     /
    •   └─VolGroup-lv_swap (dm-1) 253:1     0     2G  0 lvm      [SWAP]
    • sdb                               8:16   0     2G     0               disk 
    • sr0                              11:0    1  1024M  0               rom  
  • # dmesg | grep disk
    • sd 0:0:0:0: [sda] Attached SCSI disk
    • sd 0:0:1:0: [sdb] Attached SCSI disk
  • If you have the permission to install external utility try "lshw".
    • # lshw -short | grep disk
      • /0/100/7.1/0.0.0   /dev/cdrom  disk        SCSI CD-ROM
      • /0/100/10/0.0.0    /dev/sda    disk        16GB SCSI Disk
      • /0/100/10/0.1.0    /dev/sdb    disk        2147MB SCSI Disk

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