Please specify disadvantage of RDM, and how to modify vmfs to RDM lun?

I read through many threads and still do not understand the disadvantage of RDM.

#1 so, technically, the virtual machine is that a pointer to the SAN with RDM lun, correct? I could introduce this RDM drive easily to any server and see the data, and there may be a slight performance with RDM advantage.

If this is the case, what is the advantage of VMFS to RDM with a SAN?

#2 can a san LUN be divided into RDM disks will different VM?

#3 if I have a unused 600GO VMFS san lun and want to make that a lun RDM, how should I do this? I need to fdisk and unformat the thing first? Then remove from storage and add?

With the help of ESX 3.5 Update 2 and vCenter 2.5 Update 2.

Thank you.

#1 so, technically, the virtual machine is that a pointer to the SAN with RDM lun, correct? I could introduce this RDM drive easily to any server and see the data, and there may be a slight performance with RDM advantage.

Fix.

If this is the case, what is the advantage of VMFS to RDM with a SAN?

VMFS advantages are that you can put a lot of virtual disks on a single volume.  Its a one-to-many relationship when the RDM is a one-to-one relationship to a logic unit number by computer virtual.  There is currently a maximum of 256 LUNS per ESX host, so if you had a large number of virtual machines you could get into trouble in this way.  3 RDM by 100 hosts would be a problem.  Another consideration is that the RDM add more it, the more you complicate the management of your storage environment.  Its much easier to manage a LUN 3 or 4 to 30-40 of them.  Usually the RDM are perfect when you need of MSCS, want to take advantage of the options of SAN backup, or if you have LUNS that must be transferred to a physical server at a given time.

#2 can a san LUN be divided into RDM disks will different VM?

I think that you do not want to break the LUNS as well.  Its much easier to manage these relationships 1-1.

#3 if I have a unused 600GO VMFS san lun and want to make that a lun RDM, how should I do this? I need to fdisk and unformat the thing first? Then remove from storage and add?

Not exactly, but I think you could remove the ESX host data store and then add it as an RDM to a virtual machine.  Fdisk should be able to fix it!  But back to the point 2 - it might make more logical management of skin only 600 GB and distribute according to needs.

Good luck!

Tags: VMware

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