changeing a raw disk map in vmware from physical to cirtual

#CHANGEING A RAW DISK MAP IN VMWARE FROM PHYSICAL TO CIRTUAL SERIAL NUMBER#
#CHANGEING A RAW DISK MAP IN VMWARE FROM PHYSICAL TO CIRTUAL FULL#
#CHANGEING A RAW DISK MAP IN VMWARE FROM PHYSICAL TO CIRTUAL WINDOWS#

The setting to ignore the inquiry cache may need to be set for RDMs that are leveraging ActiveCluster. In particular, when leveraging ActiveCluster for planned migration of RDMs between arrays, because the device states will be changing in a short amount of time and the guest OS or application may encounter stale data from the host cache. This setting may need to be set depending on the Guest OS or application needs when using RDMs with ActiveCluster or ActiveDR. VMware has observed that some guest operating systems (the Virtual Machine's Operating System) and/or applications require current SCSI INQUIRY data to operate without disruption to the guest or application. By default, the guest OS will get the SCSI INQUIRY data from the ESXi host for RDMs rather than the array directly. VMware has a section in their product documentation that covers how an RDM device can be set so the guest OS will ignore the ESXi host's cache and for the guest to query the array directly for this information. This can be found in this VMware KB. Volume 4 E RDM-Example NTFS Partition 499 GB Healthy Volume # Ltr Label Fs Type Size Status Info

#CHANGEING A RAW DISK MAP IN VMWARE FROM PHYSICAL TO CIRTUAL WINDOWS#

All of the multipathing logic is handled in the lower levels of the ESXi host.īelow is an example of what a pRDM looks like within a Windows VM:ĭisk ID: All of the available paths are abstracted from the VM and the RDM is presented as a disk with a single path. This means that no MPIO configuration is required (or needed) within the virtual machines utilizing RDMs. This means that the VMware Native Multipathing Plugin (NMP) is responsible for RDM path management and not the virtual machine. Luckily things are not that complicated and the configuration is no different than that of a VMFS datastore. Now that we know the identifier and LUN ID we can look at the FlashArray to determine which volume is backing the RDMĪs seen above we are able to confirm that this particular RDM is backed by the volume called 'space-reclamation-test' on the FlashArray.Ī common question when using Raw Device Maps (RDMs) is where the multipathing configuration should be completed. Because an RDM provides the ability for a virtual machine to access the underlying storage directly it is often thought that configuration within the VM itself was required.

#CHANGEING A RAW DISK MAP IN VMWARE FROM PHYSICAL TO CIRTUAL SERIAL NUMBER#

fa - hex value of the LUN ID (250 in decimal)Ĩa75393becad4e430004e270 - volume serial number on the FlashArrayĥ.

The above string can be analyzed as follows: Once you have the vml identifier we can then find the LUN ID and the volume identifier to match it to a FlashArray volume. Under the disk properties locate the 'Physical LUN' section and note the vml identifier.Ĥ. Locate the desired RDM you wish to inspect and expand the properties of the disk.ģ. Right click on the virtual machine and select 'Edit Settings'.Ģ. There are times where you will need to determine which volume on the FlashArray is associated with a Raw Device Mapping.ġ. Identifying the underlying volume for a Raw Device Mapping While the introduction of RDMs provided several key benefits for end-users those topics are outside of the scope of this document. For an in-depth review of RDMs, and their benefits, it is recommended you review the Raw Device Mapping documentation from VMware. This technology is called a Raw Device Mapping, also known as an RDM. In the early days of ESXi, VMware provided the ability to present a volume / LUN from a backend storage array to a virtual machine directly. Removing a Raw Device Mapping from a virtual machine.Identifying the underlying volume for a Raw Device Mapping.Connecting a volume for use as a Raw Device Mapping.

#CHANGEING A RAW DISK MAP IN VMWARE FROM PHYSICAL TO CIRTUAL FULL#

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Changeing a raw disk map in vmware from physical to cirtual