25.18. Adding/Removing a Logical Unit Through rescan-scsi-bus.sh
The
sg3_utils package provides the rescan-scsi-bus.sh script, which can automatically update the logical unit configuration of the host as needed (after a device has been added to the system). The rescan-scsi-bus.sh script can also perform an issue_lip on supported devices. For more information about how to use this script, refer to rescan-scsi-bus.sh --help.
To install the
sg3_utils package, run yum install sg3_utils.
Known Issues with rescan-scsi-bus.sh
When using the
rescan-scsi-bus.sh script, take note of the following known issues:
- In order for
rescan-scsi-bus.shto work properly,LUN0must be the first mapped logical unit. Therescan-scsi-bus.shcan only detect the first mapped logical unit if it isLUN0. Therescan-scsi-bus.shwill not be able to scan any other logical unit unless it detects the first mapped logical unit even if you use the--nooptscanoption. - A race condition requires that
rescan-scsi-bus.shbe run twice if logical units are mapped for the first time. During the first scan,rescan-scsi-bus.shonly addsLUN0; all other logical units are added in the second scan. - A bug in the
rescan-scsi-bus.shscript incorrectly executes the functionality for recognizing a change in logical unit size when the--removeoption is used. - The
rescan-scsi-bus.shscript does not recognize ISCSI logical unit removals.
