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We can’t see the "LUN" in the ISM, the capacity is 1kb.

Publication Date:  2014-09-19 Views:  99 Downloads:  0
Issue Description
The customer can see "a small LUN" [1kb]"  in  esx but not  in  ISM.

He wants to delet this small lun and he is not able to do this opperation because this "small lun" is not present in ISM.
he wanted a solution to do this.
Alarm Information
No allarm.
Handling Process
How we can to disable  this  "command device”  - size 1 kb  (many customers said "a small lun" to this "command device" but is not a real lun ) ?

Perform this guide if you want to remove the command device:

1.    In the navigation tree, select a storage device, and expand the Mappings node.
2.    Click the Hosts node.
3.    In the function pane, select the host from which the command device is removed. Then, choose Command Device > Remove.
            The Warning dialog box is displayed.
4.    Read the contents in the dialog box carefully. After confirming the information, select the "I have read the warning message carefully." check box.
5. Click OK.
            The Information dialog box is displayed, stating "Operation succeeded."
6. Click OK.
Root Cause

This “small lun  - 1 kb” is not a real lun, basically it’s a "command device". 

We will find this "comand device" in ISM and we will be able to disable this "comand device" from ISM.


Removing a command device, fails the inband commands of the host (host group).
A command device is added to the host or host group.
If you do not need to manage your storage device using an inband command, you can remove the command device.