adding lun without reboot

Jonathan Billings jsbillin at
Thu May 22 18:53:31 UTC 2014

On Thu, May 22, 2014 at 2:33 PM, Widyachacra Rajapaksha
<pushpa at>wrote:

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

Due to the way Bash I/O redirection works, that probably won't work the way
you think it does.  If there is a /sys/class/scsi_host/host0 and a
/sys/class/scsi_host/host1, for example, bash will simply error out with
"/sys/class/scsi_host/host*/scan: ambiguous redirect".  It gets even more
fun if you ran 'echo "- - -" > /sys/class/scsi_host/host0/scan
/sys/class/scsi_host/host1/scan' because that's the equivalent of running
'echo "- - -" /sys/class/scsi_host/host1/scan >
/sys/class/scsi_host/host0/scan'.  EIther way, it's not what you want.

You need to either issue the command against each entry in
/sys/class/scsi_host/ (manually or with a loop), or figure out which points
to the device you want to rescan.

Jonathan Billings <jsbillin at>
College of Engineering - CAEN - Unix and Linux Support

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