Hot-add of VMware virtual disks in RHEL

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In this example, I add two 20G virtual disks to a RHEL 5 x64 VM and get the disks recognized by the OS without a reboot.

  • List current disks on the virtual SCSI bus. 
# lsscsi
[0:0:0:0]    disk    VMware   Virtual disk     1.0   /dev/sda
[0:0:1:0]    disk    VMware   Virtual disk     1.0   /dev/sdb
  • Re-scan the SCSI bus. 
# echo "- - -" > /sys/class/scsi_host/host0/scan
  • The new virtual disks now appear. 
# lsscsi
[0:0:0:0]    disk    VMware   Virtual disk     1.0   /dev/sda
[0:0:1:0]    disk    VMware   Virtual disk     1.0   /dev/sdb
[0:0:2:0]    disk    VMware   Virtual disk     1.0   /dev/sdc
[0:0:3:0]    disk    VMware   Virtual disk     1.0   /dev/sdd
  • You may now partition the disks (fdisk), create file systems (mkfs), label file systems (e2label), and mount and file systems to /etc/fstab as appropriate.
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