device mapping raw lun change possible virtual mode?

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• Try to use mapped raw LUNs to the new drive, but it is grayed out.

  I have a volume set up on my SAN for my host Dataserver and when I look at the configuration for the storage card from the host (iSCSI adapter SW) it lists the unit, so I know that he can see it.

  The problem is when I go to the Dataserver VM and try to add a new hard drive, it won't let me select "maps Raw Lun. I missed a step in the development of this device?

  To ensure that this RDM file is pointing to the correct LUN, run:

  vmkfstools q - /vmfs/volumes/.../DATASERVER_VM1_4.vmdk

  Usually you would remove a RDM disk by selecting "remove disc" when you remove it from the virtual machine (this removes only files hard and not the data on the LUN itself). However, it should work just delete the two files - the vocation and the associated descriptor file - browser data store. The data browser store will only show the name of the desctiptor file.

  If you can afford a few outages, power off the virtual computer, re - join the mapping file and then remove it by selecting meanings reported "remove disc"

  André

  PS: No host reboot is required for this action.

• raw device mapping partition ESXi 5.0 virtual storage can be a snapshot?

  ESXI version is 5.0, storage EMC CX-480.

  A virtual machine to map a raw partition of the material, the virtual function cannot be cloned or instant?

  Thank you!

  Hello and welcome to the communities.

  See http://kb.vmware.com/kb/1005241 for all the details here.

• Added raw lun mapped as a new hard drive, but VM does not see it.

  ESX 4.0 with two Windows Server 2008 virtual computer running.

  Created with SAN volumes and put at the disposal of the ESX host.

  I went in with my client vSphere virtual machine settings and added a new hard drive > mapped raw lun, stored with VM, physical and everything seems to set up correctly after hitting good. I also increased the size of the other two disks on this virtual machine. I rebooted the VM and connected to the server to find that he does not see the new drive, or he does not see the new size increases for other readers. I rebooted the host and yet, nothing new.

  What have I done wrong? Why these changes are not recognized by the virtual machine?

  After the increase in the size of disk or adding new disks, you must go the the VM Windows disk management and resize or format/partition/boot disks.

  André

• Cannot add Raw Device Mapping as hard drive

  Hello

  We have 2 Server 2008 Virtual Machines (which are clustered) that make up a Cluster 2 node x.  The ESX servers that organize these VMs (ESX Server different on each) are connected to a San.  When I place these two VMs, I could add a hard drive "Raw Device Mapping" without problem - he could see data warehouses, I had Setup on the SAN.  However when I try to add a hard drive "Raw Device Mapping" on the 2 new virtual machines, the only options I have are:

  -Create a new virtual disk

  -Use an existing virtual disk

  Any ideas why Raw Device Mappings is greyed out?

  You add the second node RDM disk by selecting "use an existing virtual disk".  The ability to add RAW devices is only available for RAW LUN which has already been mapped to a virtual machine.

  When you add the ROW to the first node, a mapping for the RDM vmdk file was created. It's that developed from the second node.

  See http://kb.vmware.com/kb/1004617 for more details.

  André

• In any case to the RAW LUN with VCB support?

  Hi all

  I know that when you have a unit number logic RAW mapping for a virtual disk that you can take snapshots in ESX or take the snap shots with VCB however is anyway to take a level backup image to a virtual machine that has a RAW LUN with VCB mapping?

  Hello

  If you convert the RAW LUN to a virtual RDM then yes VCB would work, but only for Virtual RDMs in addition to standard VMDK.

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• Best practices - virtual disk of Raw device mapping vs

  Hello

  A small question about the configuration. What would be described as the best practice to configure a comment server that required a large amount of disk space? What is the preferred option:

  1 - create a virtual machine with a mapping of raw device to the LUN (on a san)

  or

  2 - create a virtual machine with another large virtual disk that is in a data store on the LUN (on a san)

  Thank you

  Dave

  Kader you are limited with 2 TB in any case (except using the iSCSI software from within the guest operating system), the only arguments are:

  (1) use RDM if it is possible that you will connect to this physical machine LUN. Or you already have the unit number logic of a physical machine as a large file server.

  (2) VMFS use in all other situations - VMDK give flexibility, you can migrate the virtual machine where you want.

  ---

  MCSA, MCTS, VCP, VMware vExpert 2009

  http://blog.vadmin.ru

• RDM (Raw Device mapping) physical or virtual?

  Hello:

  I have VM and will add a hard drive.  RDM will be, but I was wondering what "Compatibility Mode" choose "physical or virtual?

  It's my production Oracle machine and this new drive will contains about 500 GB of DATA...

  I think it would be nice to use the 'virtual' mode, to make snapshots, but I'm worrying that, for this one big disk, it will take a lot of time and a lot of space... There are other arguments that I should consider?

  Thank you very much.

  Best regards

  olegarr

  olegarr wrote:

  Surya,

  Thank you very much for your help.

  What is any other reason to use Virtual Mode, if I used instant no?

  Thank you

  olegarr

  "design of the SAN and Deployment Guide system.

  Virtual mode for a mapping specifies full virtualization of the mapped device. He

  appears to the operating system exactly the same as a virtual disk in a file

  VMFS volume. The actual physical features are hidden. Virtual mode

  customers who use raw disks of the benefits of VMFS, such as advanced files

  locking for snapshots to streamline development and data protection processes.

  Virtual mode is also more portable across storage than the physical hardware,

  with the same behavior as a virtual disk file.

  Physical mode for a device mapping gross specifies the SCSI virtualization minimum of la

  device mapped, allowing greater flexibility for SAN management software. In

  physical, VMkernel mode all SCSI commands to the device, with a

  exception: the REPORT LUNS command is virtualized, so that VMkernel can isolate the

  volume to the virtual machine owner. Otherwise, all the physical characteristics of the

  underlying hardware are exposed. Physical mode is useful for running the SAN management

  agents or other software SCSI target on the virtual machine. Mode of physics

  also virtual and physical memory allows for cost-effective high availability clustering.

• Virtual Raw Device Mapping

  Can someone explain to me the difference between a regular virtual disk and a virtual raw device mapping? When I create the RDM I am just creating a file pointer to the correct virtual file? If yes why anyone would use virtual raw device instead of just mapping to create a typical virtual drive? I understand the benefits and limitations of the physical RDM I just do not understand the goal of the RDMS virtual.

  Well, even if a RDM in virtual mode allows you to use the tricks and VMware snapshots is not always the same thing as VMFS datastore.   As stated previously, you can easily remove this ROW and the provision of a physical server without losing a bit of data or to copy.

  If you have found this device or any other useful post please consider the use of buttons useful/correct to award points

• Move a virtual machine that has a raw lun mapped to SAN

  Dear all,

  I need expert advice for this case. I have a virtual machine on a host with esxi 4.0, but due to many machines same virtual host we are experiencing memory problems and have decided to move this virtual machine to another host with less VM and less use of resources.

  I plan 1 HR time to perform this task, this virtual machine have two drives one windows partition and the second 20 GB as mapped lun on SAN. So when you move it to another host, what I'll do is tap to stop the virtual machine, go to another host and storage switch to VM folder and add the VM.vmx file to add it to the inventory of the new host. What about the case of raw LUN mapped, how to take care of it.

  Please advise, it is little urgent.

  Thank you

  I guess there is no vCenter at stake here and you have no option for vMotion? The RDM, I would like to stop the virtual machine, detach the RDM LUN, migrating the virtual machine and re - attach the RDM.  As long as the two hosts can see SAN/RDM, you should be good with that.

• VM 2 not clustered for a raw device mapping

  Hi, I'm new in the world of VMWare. I watch discussions related to this issue, but the only one I met was on "more than a vm in the group for access to the raw device mapping drive". In this thread, we had to change the vmfs to a shared access mode.

  My question is:

  I want to have 2 vm with the same raw disk bound, but only one of them is going to power. This virtual machine (it is power on) will work with the raw disk (data base), while the other virtual machine is turned off. In the case of the first vm failed, I disabled this virtual machine and turn on the virtual machine second. This second vm start working with the database in the raw disk. How can I do this? Is necessary how to access shared for this problem?

  I hope you understand me with my poor English.

  Thank you very much.

  What you want to do is simple, you do not need to use shared mode. Probably the best way to achieve your goal is to build your first virtual machine and get it all set up and then remove (do not remove) the RDM and the clone to the virtual machine. This will result in two virtual machines with the same host name and the same SID (assuming Windows here) - two IDENTICAL systems. Power on each virtual machine in turn (only lit at the time) and add the ROW as an existing drive. As long as one virtual machine is running at the same time, there will be no problem.

  HTH,

  KLC

  Ken Cline

  Technical Director, virtualization

  Wells Landers

  TVAR Solutions, a company of the Wells Landers group

  VMware communities user moderator

• How to migrate VM from\TO Raw Device Mapping (RDM) (data store)

  Hi all

  I have aske on the migration of VM from\TO Raw Device Mapping (RDM) (data store)?

  Thank you all for your support

  If you are using vSphere 5, then you can SvMotion the VM attached to a RDM (physical or virtual) with no problems. This means that only RDM mapping file will be moved to another data store without any conversion of changes on the real disc of RDM.

  Note: Do not attempt to change the format of disc thin or thick, which would cause the RDM disk converter for virtual disk.

  More info here: http://blogs.vmware.com/vsphere/2012/02/migrating-rdms-and-a-question-for-rdm-users.html

  If vSphere 4.x is used, hot and then migrate the virtual machine to another store of data will not change the format of the ROW, only mapping file will be moved. This is true for virtual and physical RDM.

  However, the cold migrate the virtual machine to another Datatore will change the ROW to virtual disk format.

  HTH... Let me know if you have any questions...

• Grey raw device mapping

  We are implementing vsphere 5. our host machine is HP DL 380 G7 and storage storage IBM DS. We are implementing SAS SAN using HBA cables. There is no iSCSI or fiber module. We want to implement file on vphere server using win Server 2008 R2 SP1. We want to access our data directly from SAN LUN and not vmware data store. Whenever we try to add disks of virtual machines, raw device mapping is gray. If we check in the adapters of storage, we can see available LUNS. I don't add it to the data store. still, it is grayed out. Why? Please help us

  Welcome to the community,

  Please read http://kb.vmware.com/kb/1017704 to find out if your storage system supports the RDM and whether it's save to disable the ROW filter. Article is not tagged for ESXi 5.0, but I guess this also applies.

  André

• VM cloning with raw device mapped drive

  Hey people... need help.

  I have a virtual machine that lives on a 500 GB Lun. The virtual machine has a C: drive of 60 GB (OS) and a 1.5 TB Raw Device Mapped LUN.

  My problem is I'm trying to clone this machine to have a backup of it. However when I try to clone a 500 GB or even 1 TB data store it says that I don't have enough space to do. I went and removed the RDM 1.5 TB LUN in cloning options so that it would only clone the C: drive. Still the same message.

  Also I noticed that the data of 500 GB store the VM currently living has a hard 1.5 to file which I assume is the Raw Device mapped LUN. Why this creates a file if it is mapped SAN. How she even to create a file of 1.5 TB on a 500 GB data store?

  Certainly, this seems to be the reason.  Instead of a clone, use vmware converter standalone and treat the VM as a physical server.  That should allow you to continue.  If nothing else, you can 'remove' the raw device of the VM, clone and then add the raw device to the original.  Converter should work well.

  vExpert

  VMware communities moderator

  vmwise.com / @vmwise

  -KjB

• Aprarece RAW DEVICE MAPPING

  Hola

  Quiero crear una nueva virtual infrastructure mi Máquina y estoy lanzando el Assistant "customized" para indicarle "raw device mapping" hacía una lun of the cabina ISCSI as tengo.

  Me appears "aprarece" in gray.

  ¿Esto porque?, put back esx ven el cabina física, asi como el iscsi datastore software iscsi as tengo con openfiler, y tengo MVs running en esos data warehouses.

  ?¿?¿¿?

  Gracias

  Hola,

  ESO are, primero lo tiene than ver el ESX como una LUn, luego el disco Crystal for the VM as RDM lun of the esa.

  Saludos