rescan scsi linux

If we add disks in hot (from any system virtualization) it is possible that the OS does not know until we do a rescan of the SCSI bus, this can be done with the tool:

Source   
rescan-scsi-bus.sh -a

To install RedHat/Centos:

Source   
yum install sg3_utils

In Ubuntu:

Source   
aptitude install scsitools

In this way we save unnecessary reboots.

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