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How to rescan the new Storage (LUN) in Linux without reboot

In order to get the fiber channel adapters detail to rescan, list the /sys/class/fc_host
directory. In old RHEL  host you will not be getting this listing. In this case you can use
the /sys/class/scsi_host directory but it will list all internal adapters too.1. In Order to scan New Lun we need to run LIP (Loop Initialization Protocol) on the
interconnect to update the scsi layer to reflect the devices currently on the bus. LIP, is a
bus reset which cause the device addition and removal.

# ls -l /sys/class/fc_host
total 0
drwxr-xr-x 3 root root 0 Feb 27 09:11 host0
drwxr-xr-x 3 root root 0 Feb 27 09:11 host1

2. Make the OS aware of the new storage
#echo “1” > /sys/class/fc_host/host1/issue_lip
#echo “1” > /sys/class/fc_host/host2/issue_lip
#echo “- – -” > /sys/class/scsi_host/host1/scan
#echo “- – -” > /sys/class/scsi_host/host2/scan

 

 

Linux detecting SAN LUN without reboot

Detecting SAN LUN without rebooting the server in Linux

Rescan the bus by echoing the /sys filesystem (only for Linux 2.6 kernels)

For Linux 2.6 kernels only, a rescan can be triggered through the /sys interface without having to unload the host adapter driver or reboot the system. The following command will scan all channels, targets, and LUNs on host H.

echo “- – -” > /sys/class/scsi_host/host_H/scan

Example:

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

echo “- – -” > /sys/class/scsi_host/hos2/scan
echo “- – -” > /sys/class/scsi_host/hos4/scan
echo “- – -” > /sys/class/scsi_host/hos4/scan

OR
for host in `ls /sys/class/scsi_host/`;do
echo “- – -” >/sys/class/scsi_host/${host}/scan
done

Note: Below is the explanation about wild card ..

“- – -” in the above means C T L[“Channel on HBA” “Target SCSI id” “Lun”]
“- – -” is a wild card instead of specifying the C T L.

3. After rescanning, confirm whether you are seeing the new storage disks LUN] by listing the
content under proc
# cat /proc/scsi/scsi | grep scsi | uniq

4. Now we can list the newly scanned LUN using ????fdisk -l???? command.
# fdisk -l

5. If we have multipath configured then we can see as below:
# multipath
# multipath -ll

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