NFStest

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NFStest provides a set of tools for testing either the NFS client or the NFS server, included tests focused mainly on testing the client. These tools include the following:

Contents

Test utilities package

Provides a set of tools for testing either the NFS client or the NFS server, most of the functionality is focused mainly on testing the client. These tools include the following:

  • Process command line arguments
  • Provide functionality for PASS/FAIL
  • Provide test grouping functionality
  • Provide multiple client support
  • Logging mechanism
  • Debug info control
  • Mount/Unmount control
  • Create files/directories
  • Provide mechanism to start a packet trace
  • Provide mechanism to simulate a network partition
  • Support for pNFS testing

Packet trace package

Testing NFS has mostly been done using test tools like connectathon test suite, filebench, iozone and others. But mostly using the connectathon test suite. These are good tools for testing, but they are outdated and they also cannot be used for testing pNFS thoroughly.

For example, you can run the connectathon test suite on pNFS, it runs, it passes all the tests -- but how can we make sure that pNFS worked properly. How can we verify that a layout is granted, but not only that a layout is granted, what type of layout was granted (read, rw). Did the client sent IO to the data servers or to the metadata server.

The Packet trace module takes a trace file created by tcpdump and unpacks the contents of each packet. You can decode one packet at a time, or do a search for specific packets. The main difference between this modules and other tools used to decode trace files is that you can use this module to completely automate your tests.

How does it work? It opens the trace file and reads one record at a time keeping track where each record starts. This way, very large trace files can be opened without having to wait for the file to load and avoid loading the whole file into memory.

Packet layers supported:

  • Ethernet II (RFC 894)
  • IP layer (supports v4 only)
  • TCP layer
  • RPC layer
  • NFS v4.0
  • NFS v4.1 including pNFS file layouts

Requirements and limitations

In order to run the included tests, the user id in all the client hosts must have access to run commands as root using the 'sudo' command without the need for a password, this includes the host where the test is being executed. This is used to run commands like 'mount' and 'umount'. Furthermore, the user id must be able to ssh to remote hosts without the need for a password if test requires the use of multiple clients.

Network partition is simulated by the use of 'iptables', please be advised that after every test is run the iptables is flushed and reset so any rules previously setup will be lost. Currently, there is no mechanism to restore the iptables rules to their original state.

Included tests

nfstest_cache - NFS client side caching tests

Verify consistency of attribute caching by varying acregmin, acregmax, acdirmin, acdirmax and actimo. Verify consistency of data caching by varying acregmin, acregmax, acdirmin, acdirmax and actimo.

Valid for any version of NFS

nfstest_delegation - Delegation tests

Basic delegation tests verify that a correct delegation is granted when opening a file for reading or writing. Also, another OPEN should not be sent for the same file when the client is holding a delegation. Verify that the stateid of all I/O operations should be the delegation stateid. Reads from a different process on the same file should not cause the client to send additional READ packets when the client is holding a read delegation. Furthermore, a LOCK packet should not be sent to the server when the client is holding a delegation.

Recall delegation tests verify the delegation is recalled when a conflicting operation is sent to the server from a different client. Conflicting operations are reading, writing and changing the permissions on the same file. Note, that reading a file from a different client can only recall a read delegation. Also, verify that a delegation is not recalled when a different client is granted a read delegation. After a delegation is recalled, the client should send an OPEN with CLAIM_DELEGATE_CUR before returning the delegation and the stateid should be the same as the original OPEN stateid. Also, a delegation should not be granted when re-opening the file right before returning the delegation. Verify client flushes all written data before returning the WRITE delegation. The LOCK should be sent as well right before returning a delegation which has been recalled. A delegation should not be granted on the second client who cause the delegation recall on the first client.

Valid for any version of NFS granting delegations

nfstest_dio - Direct I/O tests

Functional direct I/O tests verify that every READ/WRITE is sent to the server instead of the client caching the requests. Client bypasses read ahead by sending the READ with only the requested bytes. Verify the client correctly handles eof marker when reading the whole file. Verify client ignores delegation while writing a file.

Direct I/O on pNFS tests verify the client sends the READ/WRITE to the correct DS or the MDS if using a PAGESIZE aligned buffer or not, respectively.

Direct I/O data correctness tests verify that a file written with buffered I/O is read correctly with direct I/O. Verify that a file written with direct I/O is read correctly with buffered I/O.

Vectored I/O tests verify coalescence of multiple vectors into one READ/WRITE packet when all vectors are PAGESIZE aligned. Vectors with different alignments are sent on separate packets.

Valid for NFSv4.0 and NFSv4.1 including pNFS

nfstest_pnfs - Basic pNFS functional tests

Verify basic pNFS functionality for file (both READ and WRITE), including opening a second file within the same mount and having a lock on the file. Also, verify basic pNFS functionality for a file opened for both READ and WRITE while reading the file first and then writing to it or the other way around by writing to the file fist and then reading the file. These tests verify proper functionality of pNFS and NFSv4.1 as well:

  • Verify EXCHANGE_ID is sent to MDS
  • Verify CREATE_SESSION is sent to MDS
  • Verify LAYOUTGET is sent to MDS (check layout type, iomode, layout range)
  • Verify GETDEVICEINFO is sent to MDS
  • Verify EXCHANGE_ID is sent to the correct DS
  • Verify CREATE_SESSION is sent to DS
  • Verify READ/WRITE is sent to DS (check correct stateid, correct offset and size)
  • Verify no GETATTR is sent to DS

Only valid using NFSv4.1 with pNFS enabled and file layout type

nfstest_posix - POSIX file system level access tests

Verify POSIX file system level access over the specified path using positive and negative testing.

Valid for any version of NFS

Man Pages

The man pages can be found here

Download

Main git repository:

  • git clone git://git.linux-nfs.org/projects/mora/nfstest.git
  • NFStest gitweb

Releases:

Installation

Install the rpm as root
# rpm -i NFStest-1.0.1-1.noarch.rpm
All manual pages are available
$ man nfstest
Run tests:
$ nfstest_pnfs --help
Untar the tarball
$ cd ~
$ tar -zxvf NFStest-1.0.1.tar.gz
The tests can run without installation, just set the python path
environment variable:
$ export PYTHONPATH=~/NFStest-1.0.1
$ cd NFStest-1.0.1/test
$ ./nfstest_pnfs --help
Or install to standard python site-packages and executable directories:
$ cd ~/NFStest-1.0.1
$ sudo python setup.py install
All manual pages are available
$ man nfstest
Run tests:
$ nfstest_pnfs --help
Clone the git repository
$ cd ~
$ git clone git://git.linux-nfs.org/projects/mora/nfstest.git
The tests can run without installation, just set the python path
environment variable:
$ export PYTHONPATH=~/nfstest
$ cd nfstest/test
$ ./nfstest_pnfs --help
Or install to standard python site-packages and executable directories:
$ cd ~/nfstest
$ sudo python setup.py install
All manual pages are available
$ man nfstest
Run tests:
$ nfstest_pnfs --help

Setup

Make sure user running the tests can run commands using 'sudo' without the need for a password.

Make sure user running the tests can run commands remotely using 'ssh' without the need for a password. This is only needed for tests which require multiple clients.

Create the mount point specified by the --mtpoint (default: /mnt/t) option on all the clients:

$ sudo mkdir /mnt/t
$ sudo chmod 777 /mnt/t

Examples

nfstest_pnfs
The only required option is --server
$ nfstest_pnfs --server 192.168.0.11
nfstest_cache
Required options are --server and --client
$ nfstest_cache --server 192.168.0.11 --client 192.168.0.20
Testing with different values of --acmin and --acmax (this takes a long time)
$ nfstest_cache --server 192.168.0.11 --client 192.168.0.20 --acmin 10,20 --acmax 20,30,60,80
nfstest_delegation
The only required option is --server but only the basic delegation tests will
be run. In order to run the recall tests the --client option must be used
$ nfstest_delegation --server 192.168.0.11 --client 192.168.0.20
nfstest_dio
The only required option is --server
$ nfstest_dio --server 192.168.0.11
nfstest_posix
The only required option is --server
$ nfstest_posix --server 192.168.0.11

Useful options

--help
All tests have this option to display usage information and options available.
--createlog
Create log file when specified.
--keeptraces
Do not remove any trace files at the end of execution.
--verbose <none|opts|info|debug|all|intbitmask>
Verbose level for info/debug messages
Example:
$ nfstest_posix --server 192.168.0.11 --verbose all
$ nfstest_posix --server 192.168.0.11 --verbose 0x0F
--runtest <[^]testname1[,testname2[,...]]>
Comma separated list of tests to run.
If the first character on the list is '^' then run all the tests except the ones listed.
Example:
Run only the access, chdir, creat and fcntl tests
$ nfstest_posix --server 192.168.0.11 --runtest access,chdir,creat,fcntl
Run all the tests except for open and chmod
$ nfstest_posix --server 192.168.0.11 --runtest ^open,chmod
--tverbose <group|normal|verbose>
Verbose level for test messages (default: normal).
When tverbose=group, only the test groups are displayed as PASS if all the tests in the group passed, otherwise it will FAIL. In some of the tests tverbose could be 'verbose' for a greater level of verbosity in which a particular test have many sub-tests (>100).
Example:
$ nfstest_posix --server 192.168.0.11
*** Verify POSIX API access() on NFSv4
PASS: access - file access allowed with mode F_OK
PASS: access - file access not allowed with mode F_OK for a non-existent file
PASS: access - file access allowed with mode R_OK for file with permissions 0777
PASS: access - file access allowed with mode W_OK for file with permissions 0777
PASS: access - file access allowed with mode X_OK for file with permissions 0777
...
$ nfstest_posix --server 192.168.0.11 --tverbose group
PASS: Verify POSIX API access() on NFSv4 (58 passed, 0 failed)
--bugmsgs <filename>
File containing test messages to mark as bugs if they failed.
When at least one of the tests fails the exit code is set to 1. When this option is specified, all known bugs are not counted as failures so the whole test execution is not failed. If the known bugs actually passed, using this option will fail the test to let the user know that the bug has been fixed.
--ignore
Ignore all bugs given by bugmsgs.
If this option is specified all failures given by bugmsgs are ignored. On the other hand, if a test passes which is marked as a bug, using this option the test will not failed as when using the bugmsgs option alone.
--nfsdebug <flags>
Set NFS kernel debug flags and save log messages.
Use any of the valid flags given for module 'nfs' on command 'rpcdebug'.
--rpcdebug <flags>
Set RPC kernel debug flags and save log messages.
Use any of the valid flags given for module 'rpc' on command 'rpcdebug'.

Roadmap

Priority: 1: high, 2: medium, 3: low
No. Priority Description
1 1 Merge multiple packet traces
2 1 Add support to create html output of test results
3 1 Add support to create wiki output of test results
4 3 Fix rewind() so it does not go back to the start of file
5 1 Add support for NFSv3
6 2 Add support for ancillary protocol NLM
7 2 Add support for ancillary protocol MOUNT
8 2 Add support for ancillary protocol NSM
9 3 Add support for kerberized callbacks for NFSv4.1
10 3 Add support for RDMA
11 3 Add support for NFSv4.2
12 1 Collect packet traces on all clients
13 3 Add Web/GUI interface
14 1 Add support to clear gcov counters
15 1 Add more posix tests
16 2 Add more delegation tests
17 2 Add tests for close-to-open semantics
18 2 Add mechanism to manipulate different servers
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