HOW TO SHARE A PHYSICAL CDROM AS A VIRTUAL CDROM

HOW TO SHARE A PHYSICAL CDROM AS A VIRTUAL CDROM

This document will give you a idea , to share a physical cdrom as a virtual cdrom  and assign it to a lpar ,

when we try to move a cdrom which is attached to a storage adapter for example a sata drive we have to move the whole storage adapter with all the drives connected to it ,which  is not possible as the storage adapter's child device "disks" are in use  .

If we try to remove the adapter it shows that the device is  busy as the disks connected to the adapter are in use 

 Here i am showing you how to assign a cdrom as a virtual cdrom in a a P5 box 

This procedure is also applicable to P6 and P7 box (This procedure allows us to assigned a cdrom to a lpar without moving the parent adapter   from one lpar to another )

NOTICE THAT IN P6 AND P7 THE CDROM HAS TO BE ASSIGNED TO VIO SERVER FROM START

As in my example we are using a P5 box we can move the cdrom parent adapter which is a ide adapter , for P5 and P6 if the cdrom is assigned to the VIO server from start we can jump to number 6


1. Go to the box properties and look for the adapter holding the cd rom note down its physical location


as mentioned in the figure below


Note Down the lpar holding the cdrom


Log on to the lpar








2. Verify the adapter's phycal location one you noted above with the cd rom backup adapter
and remove the adapter
This removal is necessary because the cdrom was physically assigned to this lpar previously
But in P6 or P7 env You have to plan these things from starting and assign the cdrom to vio server only

root@gurapp107(/)# lsdev -l cd0 -F physloc

U789D.001.DQD07P3-P1-C4-T2-L2-L0

root@gurapp107(/)# lsdev -l sisscsia0 -F physloc

U789D.001.DQD07P3-P1-C4

root@gurapp107(/)#

root@gurapp107(/)# rmdev -Rdl pci2

rmt0 deleted

scsi0 deleted

cd0 deleted

scsi1 deleted

sisscsia0 deleted

pci2 deleted

root@gurapp107(/)#

3. Now DLPAR the cdrom to vio server partition


Goto the VIO select tasks or the menu link at the LPAR


Select Dynamic logical Partition 


Select Physical adapter
Select Move or remove

 Unfortunately this screen shot is after i moved the adapter , but the procedure is quite simple
select the adapter  (like the two adapter still shown in the figure )


In the tab below "Move to partition" Select vio server partition


click on OK

5. Now log on to the vio server and run "cfgdev " to recognize new cdrom assign to vio server

$ lsdev -dev cd0                                                               

$                                                                              

$                                                                              

$                                                                              

$ cfgdev                                                                       

$ lsdev -dev cd0                                                               

name            status                                                         

      description                                                              

cd0             Available  16 Bit LVD SCSI DVD-RAM Drive                       

$                                                        

6. Now goto Tasks Configuration >> Virtual Resources >> Virtual Storage Management

Goto Optical Devices

Select the VIO Server to which the cdrom has been assigned

Select cdrom , then Select Modify assignment

the cdrom assigned to this vio can be seen over here

I had shown the vio server and the cdrom in a red box , notice that this is the cdrom which we dynamically moved to vio server in the above exercise

Now Select the Partition to which you want to assign the cdrom

Now at the client side run the device verification "cfgmgr" and verify that a virtual cdrom is present , To DLPAR this cdrom simply remove the cdrom from the client side and just assign to a new LPAR as in above

root@gurapp107(/)# cfgmgr

Method error (/usr/lib/methods/cfg_vclient -l vscsi1 ):

        0514-040 Error initializing a device into the kernel.

root@gurapp107(/)# lsdev -l cd0

cd0 Available  Virtual SCSI Optical Served by VIO Server

root@gurapp107(/)#

 * Source Article from : Internet