Connections Fibre and SCSI SAN/DAS directly to VM (RDM)

We currently have an implementation of the 3 very generic host to ESX 4 where all virtual machines using vmdk disk or drives mapped to the external storage.  We are looking in the update to ESXi 4.1 and potentially you virtualize two of our primary file servers, however these boxes connect to several storage units SCSI and fibre volumes.   These volumes are 4 TB and more.  For example, a server connects to 2 x 4 TB volumes by fiber (spent) and 2x2TB via SCSI DAS.  Server B connects to the volume of 1 x 4TB through fiber and 1 x 4TB volume via SCSI DAS

I'm trying to get a handle on storage that connect directly to the VM, but not to find a resource that speaks directly (at least that I am able to decern in speed reading).   My understanding is that RDM or NPIV fibre are possible methods.   NPIV seems to be out of reach, as the switch must be a mode NPIV which excludes standard SAN usage (i.e. I must have a dedicated switch just for NPIV.)  In addition, Brocade switches seem to only are NPIV supported if they are entirely stored (i.e. the E300 must have 24 active ports... it's expensive to say the least).

RDM seems to require a total appropriation of the connector.  that is, I have one HBA per hectolitre VM.  On a host ESX I virtualize the server A and B, then have 1 VMFS volume via a fiber connection, I have 4 single port / 2 dual port HBA and 3 channels for SCSI.

Basically, I think I know there is no way to use a single HBA or card SCSI to connect multiple external storage to various VM direct is just not possible (i.e. as NAT is network, NPIV is the closet in fiber and nothing available for SCSI).

iSCSI is a solution, but I have currently no iSCSI storage nor the funds to migrate the current storage in such an environment.  Have also some concerns about the performance of iSCSI... but I think it's especially of ignorance of technology than of reality.  I looked at a few fibers to iSCSI (e.g. sandbox 6140) routers, but these seem very inefficient the costs as well.

I have all options here, or is physical remaning with these solutions server my best option for now?

With RDM, you could have the present LUNS for the HBA WWD from this phase you can add it only to the VM particual. So, it's like multiple LUNS, one of THEM and a lot of VM. so he would feed your needs.

Tags: VMware

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