Differences between RDM Virtual and Physical Mode
2017-12-21 17:59
399 查看
Raw device mapping (RDM) is a mapping file that provides direct access to a LUN on an iscsi or fibre channel storage system for a virtual machine. RDM is basically a Mapping file acts as a proxy for a raw physical storage device placed in a VMFS volume. Virtual Machine can directly access the storage device using RDM and RDM contains metadata which controls the disk access to the physical device. Raw Device Mapping (RDM) gives you some of the advantages of direct access to a physical device while keeping some advantages of a virtual disk in VMFS. As a result, it merges VMFS manageability with raw device access. In this article, We are going to discuss the overview of Raw Device Mapping and difference between RDM virtual and Physical compatibility mode
RDM
Few Use cases for Raw Device Mapping
1.For Microsoft cluster configuration in Virtual machine (Virtual-to-virtual (Cluster-in-a-box and cluster-across-boxes) or physical-to-virtual)
2.For running SAN management software (Storage resource management software, storage array snapshot software, replication software, etc) inside a virtual machine
3.For any application running on a virtual machine that needs to access a device using hardware-specific SCSI commands
4.RDM is useful in physical-to-virtual conversion operations by avoiding migration of a large data LUN to a VMDK.
Types of Raw Device Mapping(RDM) Compatibility Mode
There are 2 types of Raw Device Mapping(RDM) Compatibility Mode
1.Virtual compatibility mode allows an RDM to act exactly like a virtual disk file, including the use of snapshots.
2.Physical compatibility mode allows direct access of the SCSI device for those applications that need lower level control.
11 Differences between RDM Virtual and Physical Compatibility Mode
Difference between RDM virtual and physical compatibility mode was one of the common questions people asked when we discuss RDM. Below table provides some of the important 11 differences between RDM virtual and physical compatibility mode.
Difference between virtual and physical compatibility RDM
I hope this article helps you to understand the some of the key difference between virtual and physical compatibility RDM disks. Thanks for Reading!!!. Be social and share it on social media, if you feel worth sharing it.
相关文章推荐
- Differences between RDM Virtual and Physical Mode
- Differences between Physical Address and Virtual Address!
- What is the difference between XHTML MP, XHTML Basic, WML, i-mode, and HDML?
- Difference Between Logical and Physical Database Model
- My priliminary understanding of the relationship between virtual address and physical memory address
- The difference between text mode and binary mode with file streams
- What is the difference between user mode and kernel mode, and real mode and protected mode?
- What is the difference between differed processing mode and interactive mode?
- the mapping between virtual addresses and physical addresses
- difference in physical path, root path, virutal path, relative virtual path, application path and aboslute path?
- Difference between Monitor mode and Promiscuous mode
- Difference between Pager mode and session mode
- 【转载】#349 - The Difference Between Virtual and Non-Virtual Methods
- Andoid Design-Difference between Android 4.0 and 2.3【整理版】
- Differences between Waterfall, Iterative Waterfall, Scrum and Lean Software Development
- What is the difference between max-device-width and max-width for mobile web?
- the differences between transparent, pooled, and cluster tables
- Multi-thread: What is the difference between OpenMP and MPI
- difference between TotalFreeSpace and AvailableFreeSpace
- [转]The differences between V$UNDOSTAT and V$ROLLSTAT