Virtual RDM

Similar Questions

• Physical RDM virtual RDMs taken in charge in vSphere 6.0

  Anyone know if this process in KB 1006599 works in vSphere 6.0 +?

  VMware KB: Switching between physical and virtual compatibility modes in ESX/ESXi, a mapping of raw data

  We are about to move a bunch of RDM to VMDK, but we need to convert physical to virtual RDMs first (you can live storage migration [to VMDK] with virtual RDM but not medical examinations). The other part of the story is that we are running vSphere 5.5 and are about to upgrade to vSphere 6.0

  KB wrote on October 17, 2014 and I wonder if this is still the method support in vSphere 6.0 and that it has not been updated; or if it is no longer supported, in which case I have to do the migration before the upgrade?

  Thank you

  I see no reason why this will not work in vSphere 6, given that the procedure is simply to remove the physical RDM disks and add them again as RDM virtual disks... In my view, that the KB is just outdated.

• VMware 5.1 with compatibility virtual RDM and Microsoft SQL Cluster mode

  Hello

  I am a bit confused by the VMWare documentation and hope someone can point me in the right direction.

  I want to know if it is possible and supported to create a cluster of SQL 2008 R2 2 nodes (Server 2008 R2 SP2 are VM) on a 2 node cluster VMWare 5.1 with the use of Virtual RDM compatibility?

  When you read the PDF on vsphere5.1 on the link below on page 9, there's a indicating note 'NOTE Clusters on multiple physical computers with no-pass-through RDM is supported only for Windows Server 2003 clusters. It is not supported for clustering with Windows Server 2008. »

  http://pubs.VMware.com/vSphere-51/topic/com.VMware.ICbase/PDF/vSphere-ESXi-vCenter-Server-51-Setup-MSCS.PDF

  So that means that I want "a 2-node cluster sql 2008 R2 server" is not supported?

  But I also found this link below and in the table of the column on the Cluster SQL line RDM is said 'yes' with a 2.

  VMware KB: Microsoft Clustering on VMware vSphere: guidelines for supported configurations

  Means 2/redirects-> for more information on shared disk configurations, refer to the Disk Configurations section in this article.

  -> Disk configurations

  • RDM: Configuration using a shared Quorum for storage or data must be on Fiber Channel (FC) based on RDM (physical cluster across boxes "CAB" mode, virtual mode for cluster in a box "IPC") in vSphere 5.1 and previous versions. RDM on storage other than CF (iSCSI and FCoE) are supported only in vSphere 5.5. However, in earlier versions, FCoE is supported in very specific configurations. For more information, see Microsoft clustering solutions table above note 4 .

  What follow-up note4->

  1. In vSphere 5.5, native FCoE is supported. In vSphere 5.1 update 1 and 5.0 Update 3, two cluster configuration of the node with Cisco NAC (VIC-1240/1280) cards and driver version 1.5.0.8 is compatible with Windows 2008 R2 SP1 64-bit guest operating system. For more information, see the VMware hardware compatibility guide:
     • Cisco UCS VIC1240
     • Cisco UCS VIC1280

  This means that it is suuported, I "m confused.

  Hi Bypy,

  Two windows 2008 R2 SQL virtual cluster nodes with RDM is supported only for the IPC or Cluster In a Box that is to say if the two virtual machines reside on the same host ESXi. The same configuration is not supported for the cabin or Cluster across boxes (virtual machines running on different hosts ESXi).

  The CAB, you go for the physical RDM mode.

  According to this link, http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1037959

  SQL Cluster using windows 2008 R2 is supported for both physical and virtual mode RDM. Between physical and virtual mode depends on whether you want the CAB or IPC respectively.

  I hope this helps.

  See you soon,.

  Arun

• physical conversion RDM virtual RDM

  Hello

  is this possible without actual destroying RDM and constituting in RDM virtual physical? We have more than 2 TB of data on it and online extension is problem because virtual RDM must be restarted to recognize the new drive size...

  Damir

  Hello

  It can happen only when the virtual machine is turned off.

  Best regards

  Edward L. Haletky

  VMware communities user moderator

  ====

  Author of the book "VMWare ESX Server in the enterprise: planning and securing virtualization servers, Copyright 2008 Pearson Education.»

  Blue gears and SearchVMware Pro Articles: http://www.astroarch.com/wiki/index.php/Blog_Roll

  Security Virtualization top of page links: http://www.astroarch.com/wiki/index.php/Top_Virtualization_Security_Links

• virtual RDM and instant

  Hello

  I'm trying to better understand the operation of snapshots when you have a VM with RDM disks in virtual mode.

  If you take a snapshot of a virtual machine, and then write to a disc RDM in virtual mode, when you go back, this write request get reversed on the SAN because the RDM vmdk file is replaced?

  Thank you

  Rudi

  The disk i/o after the snapshot is always written directly to the LUN at some point and when you return, the disk i/o is reversed.  Is this correct? Or the disk i/o after a snapshot is written to the file pointer only?

  This isn't how it works. Think of a RDM in virtual compatibility mode as a normal virtual disk. As long as there in no snapshot on this disc RDM, all I/O is done on the RDM itself. Once a snapshot is created, any changes are written to a virtual disk on VMFS datastore to a delta file. If you make the snapshot, the changes are merged into the RDM. If you go back to the snapshot, the changes recorded in the delta file will be ignored.

  André

• Snapshots on virtual RDM - where do they go?

  If I have a Raw Device Mappings (in virtual mode) disk to a virtual machine and then someone makes a snapshot on this VM - where the delta for the RDM files go? As the RDM is a pointer directly on a LUN, I suspect that they cannot be placed here?

  Snapshots for RDM in virtual mode behave like snapshots for virtual disks. They are created in the home of the virtual machine folder by default.

  André

• convert physical RDM to virtual RDM

  is there any document to change physical RDM to RDM virtual to a virtual machine?

  I think http://kb.vmware.com/kb/1006599 is what you are looking for.

  André

• Conversion of physical to virtual RDM

  Hi all

  I just stopped my VM and to convert the existing drive in virtual compatibility mode, but somehow the option is disabled?

  How can I change itin vSphere client 4.u1

  can someone help me please?

  Kind regards

  AWT

  Please remove the disc RDM and re - add again in the correct mode.

  André

• Machine virtual RDM + Windows Server 2008 R2

  Hi all

  My client is currently going through a hardware installation and upgrading ESX.  They currently have the following configuration

  3 x ESX 4.0 hosts

  1 x Server 2008 R2 Management Server (vCenter)

  1 x 4 TB SAN (Fibre)

  They want to create a file server virtual computer (let's call it vFileServer) and then add a vDisk via RDM which must connect a 700 GB NTFS LUN on the SAN.  Then also present this logic unit number on the vCenter server and go directly from here for backups on tape file level.  Installation and configuration of the solution worked without a hitch, however, they have today gone live on the new VM vFileServer, but the data are not updated on the disk of the vCenter server.

  When I restart the server vCenter, he runs a ChkDsk on the LUN process, and then updates.

  Can someone tell me the solution on how to have these data refresh immediately?  I have run some tests on the vCenter server and data seem to update on the virtual computer successfully, but it only seems to work 1 way.

  Thanks in advance.

  This 'vFileServer' VM, have this NTFS this RAW LUN and its disposal.  Then create a share for other servers to access the data on this LUN.  This would be the way to present these data to the other server.  Any "clustering" using the RDM will be available via MSCS

• Virtual RDM: mapping in the vm, VMFS folder file size

  Hello

  I just migrated an iscsi LUN previously managed the MS iscsi initiator (running inside a machine virtual w2k03) to ESX iscsi sw, preserving the data.

  I used RDM (raw device mapping) and I had to use 'virtual' because 'physical' hanged the VM at startup of the operating system.

  The iscsi LUN is 1 TB, with about 60GB used.

  I noticed that on the volume VMFS file mapping for the virtual machine is about 2 GB: happen when on the iscsi LUN more space will be used? And if it goes, is there a rule to calculate how much?

  I'm worried I might risk running out of space on the VMFS volume because of the mapping of RDM file...

  Thank you

  Guido

  It's just a pointer to the original disc of RDM.   I have a few MS Cluster in my setup. For 18 GB RDM Lun he creates about 100 MB.

  Thank you

• How to get space disc + space of a computer virtual RDM

  Hi all

  I would like to know, used by the two RDM + VMDK VM hard drive space

  I get the details using the script below

  Get - VM | Get-hard drive |

  Select @{N = "Name VM"; E={$_. Parent.Name}},

  @{N = 'IP address'; E={@($_. (Parent.guest.IPAddress[0])}},

  @{N = "VM PowerState"; E={@($_. Parent.PowerState)}}.

  @{N = "number of CPU"; E={@($_. Parent.NumCPU)}}.

  @{N = "MemoryInGB"; E={@($_. Parent.MemoryGB)}}.

  @{N = 'Cluster'; E = {Get-Cluster - VM $_.} Parent}},

  @{N = "ESX host"; E = {Get-VMHost - VM $_.} Parent}},

  @{N = 'File'; E={$_. Parent.Folder.Name}},

  @{N = "HD capability"; E={$_. CapacityGB}},

  @{N = "Datastore"; {E = {Get-Datastore - VM $_}},

  I'm looking for an output similar as below

  VM name IP address VM PowerState CPU Count MemoryinGB Cluster ESXHost Capacity(VMDK+RDM) HD Datastore folder

  VM1 10.10.10.10 receptor 4 8 ABC 11.11.11.11 2048 data store 1

  VM2

  10.10.10.11

  Receptor

  4

  8

  ABC ABC 11.11.11.13 3096

  Data store 2

  If you want just the size of the configured disk (i.e. not the amount actually used)

  Get - VM |

  Select @{N = "Name VM"; E={$_. Name}},

  @{N = 'IP address'; E = {@($_.guest.) (IPAddress[0])}},

  @{N = "VM PowerState"; E={@($_. PowerState)}}.

  @{N = "number of CPU"; E={@($_. NumCPU)}}.

  @{N = "MemoryInGB"; E={@($_. MemoryGB)}}.

  @{N = 'Cluster'; {E = {Get-Cluster - VM $_}},

  @{N = "ESX host"; {E = {Get-VMHost - VM $_}},

  @{N = 'File'; E={$_. Folder.Name}},

  @{N = "HD capability"; E = {[Math]: round (((Get-disque dur-VM $_ |))} Measure-Object-CapacityGB property-sum). (Sum), 2)}},

  @{N = "Datastore"; {E = {Get-Datastore - VM $_}}

• Questions of snapshot after lack of space on Virtual Mode RDM

  We have a windows file server that ran out of disk space for its virtual RDM mode.  The server has several outstanding shots (VCB-created).  The LUN has been expanded and serve hung and restarted.  Restarts, none of the snapshots are loaded--just the VMDK origin.  None of the snapshots are displayed in the Snapshot Manager.

  If the sanpshots can be removed (commit all) or is it likely to corruption in the last Flash disk?  Wouldn't be better to remove the last snapshot and delete everything.  All the world is this themselves before?

  Thanks in advance for any idea that you can share.

  Hello

  I was wondering if you mind answering some questions before tackle us this?

  When you say

  Server that ran out of disk space, because it is the virtual mode of RDM

  do you mean the data store that hosts the virtual RDM or the actual volume of RDM file?

  Can you also check your VI client and see what VMDK virtual machine thinks it is running off? i.e. servername.vmdk or servername - 000001.vmdk

  Thank you and best regards,

  Glen

• moving from the virtual computer of vmfs to rdm virtual drive

  I have some disks that are now on filessytem vmfs. want to move them to virtual rdms.

  anyway to do

  You can use vmkfstools to import the vmdk files to a raw devices:

  vmkfstools-i src.vmdk d rdm:/vmfs/devices/disks/naa.xxxx dest - map.vmdk

• Convert physical RDM to RDM virtual disc Exchange

  Hi all

  I need to convert a shared disk (SAN LUNS) used by Exchange 2007 SP1 of RDM physical to virtual RDM, I would like to have a confirmation fo this strategy:

  1. Turning off the virtual Exchange Server computer

  2. Remove the disc in the virtual machine configuration vRDM mode (not the disc, of course)

  3. Fix the disc in mode pRDM

  4. Turn on the virtual machine

  Question:

  This stratey is correct?

  could I have a problem with the disc will type?

  Thanks in advance

  Angelo

  Hello.

  That's it – you can document the file mapping according to how many of them you have.  The procedure is also documented in KB 1006599.

  Good luck!

• OK to remove the mapping of RDM?

  I need to cold migrate some virtual machines with virtual RDM mode on new servers. I'll introduce the RDM with different numbers of LUNS on the target hosts. My co worker suggests that when you remove the ROW before the migration of the cold, you can not delete the mapping file, otherwise this will cause data corruption, so it selects the removal of the option of vm (not remove and delete).

  My understanding is the file ROW is just a mapping file and is safe to delete. My thought is that delete saves space and accelerates the migration time.

  RDM files can simply be removed without data corruption?, most vmware articles suggest they can and they're just mapping files.

  When the virtual machine allows you new hosts, a new virtual RDM will be added when the lun is presented to the new hosts.

  Yes, you can delete the ROW with removal of the VM disk option before the migration of the cold.

  It won't cause any data corruption that all data is on LUN storage.

  RDM file contain only for the LUN mapping information.

  Once you have completed the migration of VM, you can add RDM LUN to VM, just make sure that you attach Correct RDM LUN to VM.

  See this KB for more information-

  VMware KB: Switching between physical and virtual compatibility modes in ESX/ESXi, a mapping of raw data