Add shared disks without shutdown vm

Hi all,
we have a Pc with VMWare 2 and two VMS with
Oracle 10g on RAC and CentOS 4.7 . There are two nodes (or vms): rac1 and rac2.
Each VM has shared SCSI disks.
Is there any way to add shared disks without shutdown the VMs?
thank you.

Well,
Look the link:
http://www.vmware.com/support/ws5/doc/ws_disk_add_virtual.html
You must shutdown the instance.
but in your case, I dont know, maybe shutdown one VM, add the disk, and restart.
So, shutdown other vm, add the same disk, and restart. After, you can add the disk to disk group
if you are using ASM.
Please, correct me if I'm wrong.
Cheers

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Thank-You Jason and Changhai,
i think i've found the problem.
i do not have enough memory for the second node.
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The issue isn't how to unmount the disk (that's the easy part), the problem is when to trigger it.
There is no standard mechanism for launching a script at shutdown, so there's no way to tell your script to run prior to the shutdown.
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Add shared disks without shutdown vm

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