Increasing mapped raw lun size.

[Guv]

I have question regarding netapp storage and vmware sphere.  We have a netapp filer FAS6080, and have setup some volumes and qtrees.  Within a qtree we have setup some LUNS.  One of the luns we have attached to a VM  as a mapped RAW lun which is about 300gb disk space.  So in the VM which is a windows 2003 guest has a 300gb disk.  We are running vspher v4.1   

There is a request now to add an extra 250gb disk space to this disk in the VM.  So on the netapp we have to increase lun by 250 GB space.   Once increased would the map raw lun automatically increase on the windows box or would we need to reboot it or something to show the increase in the disk size.

[iw123]

Hi,

Is your RDM in physical or virtual mode? This is important as it will affect the process you use. You can find out more here: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=100702...

thanks

[Guv]

its virtual, does that help.

Thanks

[iw123]

It just means the process is different

For RDMs in virtual compatibility mode

To safely expand the RDM:

1. Stop the virtual machine and remove the RDM from the virtual  machine. Before you do this, note the scsiX:Y position of the RDM in VM  Settings.
2. Expand the RDM LUN from the SAN side. Contact your vendor for assistance.
3. Perform rescan on the ESX and verify the new LUN size is observed.
4. Recreate the RDM mapping. Click VM Settings > Add > Hard Disk > RDM, then select the scsiX:Y position that the RDM was using before.
5. Start the virtual machine and perform a rescan from the guest operating system. Consult your vendor for assistance.

Have a look at the KB article i attached on first post before doing anything