Rescan SCSI on Linux

I constantly need to add disk to fiber channel based linux systems.  Here are a few methods that work for me:

Locate the location of your HBA’s:

ls -al /sys/class/scsi_host/

Rescan the HBA’s

echo “- – -” > /sys/class/scsi_host/host0

echo “- – -” > /sys/class/scsi_host/host1

You can view /var/log/messages to see if any lun’s / /dev/sd# locations were added. Or do a ls -altr /dev/sd*

Also you might want to look at this post.

On VMware you can dynamically add lun’s but you don’t have any HBA’s.  I have found the following script does a great job of rescanning the hard drives:


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.