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Detect the lun

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Operating Systems Linux Red Hat Detect the lun
# 1  
Old 03-30-2012
Detect the lun
Hi,

Is there command to detect the newly added LUN is linux box. I tried with below commands, but that doesn't work out.

Code:
fdisk -l,
fdisk -l | grep Disk
pvscan

Last edited by radoulov; 10-25-2012 at 03:22 PM..
# 2  
Old 03-30-2012
fdisk shows already discovered devices. pvscan only works if the LUN is discovered and is a Physical Volume (made through pvcreate command)

Here's what you need to do:
Code:
echo "scsi-qlascan" > /proc/scsi/<driver-name>/<adapter-id>

To find driver_name, try dmesg | tail

Then, try this:
Code:
echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi

Now you should be able to see the LUN.
# 3  
Old 03-30-2012
you can either use tools provided by the adapter, or you can find a script online called "rescan-scsi-bus.sh"

It is open source, and free to use. That will do all the magic behind the scenes for you.
# 4  
Old 03-31-2012
Hi,

Thanks admin_xor,

I tried with the below command to identify the lun

Code:
echo "- - -" > /sys/class/scsi_host/host5/scan

Here, I have an another issue, how to identify the allocated lun id

Forg eg :

Code:
fbvol  462E  lun # 04 (hx)

Last edited by radoulov; 10-25-2012 at 03:22 PM..
# 5  
Old 03-31-2012
If you are using EMC storage take output of powermt display dev=all output before scan and after scan find the difference of both output.It will help you to identify newly added luns..
# 6  
Old 04-02-2012
@ Susindram,

Its a IBM SAN storage.
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