How to add SCSI disk on RHEL 6 in VMWARE

To add SCSI disks to your RHEL6 system without rebooting your machine, you have to rescan the newly disks using the following commands.

If you are running your OS in a Production environment, extra disks can be added or removed without a need of rebooting the Linux machine.

How to add a new disk :
Once you have present your new disk or Lun to the RHEL OS run :

# echo "- - -" >/sys/class/scsi_host/host#/scan

The "- - -" is used for the bus channel, Target Id and Lun.

Check the /var/log/messages to find the new device name or by checking the /proc/partitions file.

# tail -f /var/log/messages
# cat /proc/partitions

If your new disk name is /dev/sdb , get more information about it by running
# fdisk -l /dev/sdb

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