Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com
Answertopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

System Administration Guide: Network Services
Previous Next

NFS Over RDMA

Starting in the Solaris 10 release, the default transport for NFS is the Remote Direct Memory Access (RDMA) protocol, which is a technology for memory-to-memory transfer of data over high-speed networks. Specifically, RDMA provides remote data transfer directly to and from memory without CPU intervention. RDMA also provides direct data placement, which eliminates data copies and, therefore, further eliminates CPU intervention. Thus, RDMA relieves not only the host CPU, but also reduces contention for the host memory and I/O buses. To provide this capability, RDMA combines the interconnect I/O technology of InfiniBand on SPARC platforms with the Solaris operating system. The following figure shows the relationship of RDMA to other protocols, such as UDP and TCP.

Figure 6-1 Relationship of RDMA to Other Protocols
The context describes the graphic.

Because RDMA is the default transport protocol for NFS, no special share or mount options are required to use RDMA on a client or server. The existing automounter maps, vfstab and dfstab, work with the RDMA transport. NFS mounts over the RDMA transport occur transparently when InfiniBand connectivity exists on SPARC platforms between the client and the server. If the RDMA transport is not available on both the client and the server, the TCP transport is the initial fallback, followed by UDP if TCP is unavailable. Note, however, that if you use the proto=rdma mount option, NFS mounts are forced to use RDMA only.

To specify that TCP and UDP be used only, you can use the proto=tcp/udp mount option. This option disables RDMA on an NFS client. For more information about NFS mount options, see the mount_nfs(1M) man page and mount Command.


Note - RDMA for InfiniBand uses the IP addressing format and the IP lookup infrastructure to specify peers. However, because RDMA is a separate protocol stack, it does not fully implement all IP semantics. For example, RDMA does not use IP addressing to communicate with peers. Therefore, RDMA might bypass configurations for various security policies that are based on IP addresses. However, the NFS and RPC administrative policies, such as mount restrictions and secure RPC, are not bypassed.


Previous Next

 
 
  Published under the terms fo the Public Documentation License Version 1.01. Design by Interspire