[CentOS] Automatically detecting LUNs without a reboot

cpolish at surewest.net cpolish at surewest.net
Wed Sep 1 00:00:25 EDT 2010

On Tue, Aug 31, 2010 at 04:48:01PM +0100, Gabriel Tabares wrote:
>  From there, I went to
> http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/html/Online_Storage_Reconfiguration_Guide/rescan-scsi-bus.html
> Where it says :
> "In order for |rescan-scsi-bus.sh| to work properly, |LUN0| must be the 
> first mapped logical unit. The |rescan-scsi-bus.sh| can only detect the 
> first mapped logical unit if it is |LUN0|. The |rescan-scsi-bus.sh| will 
> not be able to scan any other logical unit unless it detects the first 
> mapped logical unit even if you use the |--nooptscan| option. "
> So I went to the array interface, deleted the volumes and tried 
> re-creating a new volume with a LUN ID of 0, and I get the following error:
> "Unable to create volume vd01_v001.
> LUN zero is reserved as the SCC/SES device on this host. (vd01_v001) - 
> The LUN specified (0) must be in the range of 1 - 511."
> I can't create a LUN with ID 0, which means that rescan-scsi-bus.sh will 
> not work, as per the above text.
> Any more suggestions?
> Thanks
> Gabriel

rescan-scsi-bus is a shell script. It accepts this argument:

--luns=LIST     Scan only lun(s) in LIST

so it may work for you after all?

Charles Polisher

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