mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 16:41:58 +00:00
272 lines
9.0 KiB
Plaintext
272 lines
9.0 KiB
Plaintext
################################################################################
|
|
# #
|
|
# NFS/RDMA README #
|
|
# #
|
|
################################################################################
|
|
|
|
Author: NetApp and Open Grid Computing
|
|
Date: May 29, 2008
|
|
|
|
Table of Contents
|
|
~~~~~~~~~~~~~~~~~
|
|
- Overview
|
|
- Getting Help
|
|
- Installation
|
|
- Check RDMA and NFS Setup
|
|
- NFS/RDMA Setup
|
|
|
|
Overview
|
|
~~~~~~~~
|
|
|
|
This document describes how to install and setup the Linux NFS/RDMA client
|
|
and server software.
|
|
|
|
The NFS/RDMA client was first included in Linux 2.6.24. The NFS/RDMA server
|
|
was first included in the following release, Linux 2.6.25.
|
|
|
|
In our testing, we have obtained excellent performance results (full 10Gbit
|
|
wire bandwidth at minimal client CPU) under many workloads. The code passes
|
|
the full Connectathon test suite and operates over both Infiniband and iWARP
|
|
RDMA adapters.
|
|
|
|
Getting Help
|
|
~~~~~~~~~~~~
|
|
|
|
If you get stuck, you can ask questions on the
|
|
|
|
nfs-rdma-devel@lists.sourceforge.net
|
|
|
|
mailing list.
|
|
|
|
Installation
|
|
~~~~~~~~~~~~
|
|
|
|
These instructions are a step by step guide to building a machine for
|
|
use with NFS/RDMA.
|
|
|
|
- Install an RDMA device
|
|
|
|
Any device supported by the drivers in drivers/infiniband/hw is acceptable.
|
|
|
|
Testing has been performed using several Mellanox-based IB cards, the
|
|
Ammasso AMS1100 iWARP adapter, and the Chelsio cxgb3 iWARP adapter.
|
|
|
|
- Install a Linux distribution and tools
|
|
|
|
The first kernel release to contain both the NFS/RDMA client and server was
|
|
Linux 2.6.25 Therefore, a distribution compatible with this and subsequent
|
|
Linux kernel release should be installed.
|
|
|
|
The procedures described in this document have been tested with
|
|
distributions from Red Hat's Fedora Project (http://fedora.redhat.com/).
|
|
|
|
- Install nfs-utils-1.1.2 or greater on the client
|
|
|
|
An NFS/RDMA mount point can be obtained by using the mount.nfs command in
|
|
nfs-utils-1.1.2 or greater (nfs-utils-1.1.1 was the first nfs-utils
|
|
version with support for NFS/RDMA mounts, but for various reasons we
|
|
recommend using nfs-utils-1.1.2 or greater). To see which version of
|
|
mount.nfs you are using, type:
|
|
|
|
$ /sbin/mount.nfs -V
|
|
|
|
If the version is less than 1.1.2 or the command does not exist,
|
|
you should install the latest version of nfs-utils.
|
|
|
|
Download the latest package from:
|
|
|
|
http://www.kernel.org/pub/linux/utils/nfs
|
|
|
|
Uncompress the package and follow the installation instructions.
|
|
|
|
If you will not need the idmapper and gssd executables (you do not need
|
|
these to create an NFS/RDMA enabled mount command), the installation
|
|
process can be simplified by disabling these features when running
|
|
configure:
|
|
|
|
$ ./configure --disable-gss --disable-nfsv4
|
|
|
|
To build nfs-utils you will need the tcp_wrappers package installed. For
|
|
more information on this see the package's README and INSTALL files.
|
|
|
|
After building the nfs-utils package, there will be a mount.nfs binary in
|
|
the utils/mount directory. This binary can be used to initiate NFS v2, v3,
|
|
or v4 mounts. To initiate a v4 mount, the binary must be called
|
|
mount.nfs4. The standard technique is to create a symlink called
|
|
mount.nfs4 to mount.nfs.
|
|
|
|
This mount.nfs binary should be installed at /sbin/mount.nfs as follows:
|
|
|
|
$ sudo cp utils/mount/mount.nfs /sbin/mount.nfs
|
|
|
|
In this location, mount.nfs will be invoked automatically for NFS mounts
|
|
by the system mount commmand.
|
|
|
|
NOTE: mount.nfs and therefore nfs-utils-1.1.2 or greater is only needed
|
|
on the NFS client machine. You do not need this specific version of
|
|
nfs-utils on the server. Furthermore, only the mount.nfs command from
|
|
nfs-utils-1.1.2 is needed on the client.
|
|
|
|
- Install a Linux kernel with NFS/RDMA
|
|
|
|
The NFS/RDMA client and server are both included in the mainline Linux
|
|
kernel version 2.6.25 and later. This and other versions of the 2.6 Linux
|
|
kernel can be found at:
|
|
|
|
ftp://ftp.kernel.org/pub/linux/kernel/v2.6/
|
|
|
|
Download the sources and place them in an appropriate location.
|
|
|
|
- Configure the RDMA stack
|
|
|
|
Make sure your kernel configuration has RDMA support enabled. Under
|
|
Device Drivers -> InfiniBand support, update the kernel configuration
|
|
to enable InfiniBand support [NOTE: the option name is misleading. Enabling
|
|
InfiniBand support is required for all RDMA devices (IB, iWARP, etc.)].
|
|
|
|
Enable the appropriate IB HCA support (mlx4, mthca, ehca, ipath, etc.) or
|
|
iWARP adapter support (amso, cxgb3, etc.).
|
|
|
|
If you are using InfiniBand, be sure to enable IP-over-InfiniBand support.
|
|
|
|
- Configure the NFS client and server
|
|
|
|
Your kernel configuration must also have NFS file system support and/or
|
|
NFS server support enabled. These and other NFS related configuration
|
|
options can be found under File Systems -> Network File Systems.
|
|
|
|
- Build, install, reboot
|
|
|
|
The NFS/RDMA code will be enabled automatically if NFS and RDMA
|
|
are turned on. The NFS/RDMA client and server are configured via the hidden
|
|
SUNRPC_XPRT_RDMA config option that depends on SUNRPC and INFINIBAND. The
|
|
value of SUNRPC_XPRT_RDMA will be:
|
|
|
|
- N if either SUNRPC or INFINIBAND are N, in this case the NFS/RDMA client
|
|
and server will not be built
|
|
- M if both SUNRPC and INFINIBAND are on (M or Y) and at least one is M,
|
|
in this case the NFS/RDMA client and server will be built as modules
|
|
- Y if both SUNRPC and INFINIBAND are Y, in this case the NFS/RDMA client
|
|
and server will be built into the kernel
|
|
|
|
Therefore, if you have followed the steps above and turned no NFS and RDMA,
|
|
the NFS/RDMA client and server will be built.
|
|
|
|
Build a new kernel, install it, boot it.
|
|
|
|
Check RDMA and NFS Setup
|
|
~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Before configuring the NFS/RDMA software, it is a good idea to test
|
|
your new kernel to ensure that the kernel is working correctly.
|
|
In particular, it is a good idea to verify that the RDMA stack
|
|
is functioning as expected and standard NFS over TCP/IP and/or UDP/IP
|
|
is working properly.
|
|
|
|
- Check RDMA Setup
|
|
|
|
If you built the RDMA components as modules, load them at
|
|
this time. For example, if you are using a Mellanox Tavor/Sinai/Arbel
|
|
card:
|
|
|
|
$ modprobe ib_mthca
|
|
$ modprobe ib_ipoib
|
|
|
|
If you are using InfiniBand, make sure there is a Subnet Manager (SM)
|
|
running on the network. If your IB switch has an embedded SM, you can
|
|
use it. Otherwise, you will need to run an SM, such as OpenSM, on one
|
|
of your end nodes.
|
|
|
|
If an SM is running on your network, you should see the following:
|
|
|
|
$ cat /sys/class/infiniband/driverX/ports/1/state
|
|
4: ACTIVE
|
|
|
|
where driverX is mthca0, ipath5, ehca3, etc.
|
|
|
|
To further test the InfiniBand software stack, use IPoIB (this
|
|
assumes you have two IB hosts named host1 and host2):
|
|
|
|
host1$ ifconfig ib0 a.b.c.x
|
|
host2$ ifconfig ib0 a.b.c.y
|
|
host1$ ping a.b.c.y
|
|
host2$ ping a.b.c.x
|
|
|
|
For other device types, follow the appropriate procedures.
|
|
|
|
- Check NFS Setup
|
|
|
|
For the NFS components enabled above (client and/or server),
|
|
test their functionality over standard Ethernet using TCP/IP or UDP/IP.
|
|
|
|
NFS/RDMA Setup
|
|
~~~~~~~~~~~~~~
|
|
|
|
We recommend that you use two machines, one to act as the client and
|
|
one to act as the server.
|
|
|
|
One time configuration:
|
|
|
|
- On the server system, configure the /etc/exports file and
|
|
start the NFS/RDMA server.
|
|
|
|
Exports entries with the following formats have been tested:
|
|
|
|
/vol0 192.168.0.47(fsid=0,rw,async,insecure,no_root_squash)
|
|
/vol0 192.168.0.0/255.255.255.0(fsid=0,rw,async,insecure,no_root_squash)
|
|
|
|
The IP address(es) is(are) the client's IPoIB address for an InfiniBand
|
|
HCA or the cleint's iWARP address(es) for an RNIC.
|
|
|
|
NOTE: The "insecure" option must be used because the NFS/RDMA client does
|
|
not use a reserved port.
|
|
|
|
Each time a machine boots:
|
|
|
|
- Load and configure the RDMA drivers
|
|
|
|
For InfiniBand using a Mellanox adapter:
|
|
|
|
$ modprobe ib_mthca
|
|
$ modprobe ib_ipoib
|
|
$ ifconfig ib0 a.b.c.d
|
|
|
|
NOTE: use unique addresses for the client and server
|
|
|
|
- Start the NFS server
|
|
|
|
If the NFS/RDMA server was built as a module (CONFIG_SUNRPC_XPRT_RDMA=m in
|
|
kernel config), load the RDMA transport module:
|
|
|
|
$ modprobe svcrdma
|
|
|
|
Regardless of how the server was built (module or built-in), start the
|
|
server:
|
|
|
|
$ /etc/init.d/nfs start
|
|
|
|
or
|
|
|
|
$ service nfs start
|
|
|
|
Instruct the server to listen on the RDMA transport:
|
|
|
|
$ echo rdma 2050 > /proc/fs/nfsd/portlist
|
|
|
|
- On the client system
|
|
|
|
If the NFS/RDMA client was built as a module (CONFIG_SUNRPC_XPRT_RDMA=m in
|
|
kernel config), load the RDMA client module:
|
|
|
|
$ modprobe xprtrdma.ko
|
|
|
|
Regardless of how the client was built (module or built-in), use this
|
|
command to mount the NFS/RDMA server:
|
|
|
|
$ mount -o rdma,port=2050 <IPoIB-server-name-or-address>:/<export> /mnt
|
|
|
|
To verify that the mount is using RDMA, run "cat /proc/mounts" and check
|
|
the "proto" field for the given mount.
|
|
|
|
Congratulations! You're using NFS/RDMA!
|