RedHat - Adding extra disk

I have redhat 5.5 running on ESX host as a VM.

i just added 8 gb of Hard Disk thorough vSphere and i wanted to know how i do see this disk on the OS?
ittechlabLinux SupportAsked:
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Chris WongCommented:
Adding a Hard Drive in Linux

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ittechlabLinux SupportAuthor Commented:
I saw this article just before you post.
Thanks anyway.

My question was I am running a RedHat VM and added a extra disk and wants to see the disk without rebooting the VM or host.

is there anyway to scan and see the newly added disk

This is running on ESX host as a one of the VM.
Chris WongCommented:
Rescan the SCSI Bus to Add a SCSI Device Without rebooting the VM
ittechlabLinux SupportAuthor Commented:
Only way i can get it working is by rebooting.
Not sure why it does not work without rebooting
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