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Acceptance Small (acc-sm) Testing on Lustre

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The Lustre QE group and developers use acceptance-small (acc-sm) tests to catch bugs early in the development cycle. Within the Lustre group, acc-sm tests are run on YALA, an automated test system. This information is being published to describe the steps to perform acceptance small testing and encourage wider acc-sm testing in the Lustre community.

NOTE: For your convenience, this document is also available as a PDF.

What is acc-sm testing and why do we use it for Lustre?

Acceptance small (acc-sm) testing is a suite of test cases used to verify different aspects of Lustre functionality.

  • These tests are run using the acceptance-small.sh script.
  • The script is run from the lustre/tests directory in a compiled Lustre tree.
  • The acceptance-small.sh script runs a number of test scripts that are also run by the ltest (Buffalo) test harness on Lustre test clusters.

What tests comprise the acc-sm test suite?

Each CVS branch contains a lustre/tests sub-directory; all acc-sm tests are stored here. The acceptance-small.sh file contains a list of all tests in the acc-sm suite. To get the list, run:

$ grep TESTSUITE_LIST acceptance-small.sh

The acc-sm tests are listed below, by CVS branch.

b1_6 branch

This branch includes 17 acc-sm test suites.

$ grep TESTSUITE_LIST acceptance-small.sh

b1_8_gate branch

This branch includes 18 acc-sm test suites.

$ grep TESTSUITE_LIST acceptance-small.sh

HEAD branch

This branch includes 19 acc-sm test suites.

$ grep TESTSUITE_LIST acceptance-small.sh

To see the test cases in a particular acc-sm test, run:

$ grep run_ <testunit_script>

For example, to see the test cases that comprise the SANITY test:

$ grep run_ sanity.sh | tail -3
run_test 130c "FIEMAP (2-stripe file with hole)"
run_test 130d "FIEMAP (N-stripe file)"
run_test 130e "FIEMAP (test continuation FIEMAP calls)"

For each acc-sm test, what does it measure or show?

The acc-sm test suite are described below.

A basic regression test with unmount/remount.
Verifies Lustre operation under normal operating conditions.
Dbench benchmark for simulating N clients to produce the filesystem load.
Bonnie++ benchmark for creation, reading and deleting many small files
IOzone benchmark for generating and measuring a variety of file operations.
Filesystem exerciser.
Verifies operations from two clients under normal operating conditions.
Tests e2fsck and lfsck to detect and fix filesystm corruption.
Runs a test linked to a liblustre client library.
Verifies recovery after an MDS failure.
Verifies various Lustre configurations (including wrong ones), where the system must behave correctly.
Verifies RPC replay after a communications failure (message loss).
Verifies recovery after an OST failure.
Verifies recovery from two clients after a server failure.
Tests multiple concurrent failure conditions.
Verifies filesystem quotas.

How do you get the acc-sm tests?

The acc-sm test suite is stored in the lustre/tests sub-directory on each CVS branch (b1_6, b1_8, and HEAD).

Do you have to run every acc-sm test?

No. You can choose to run only specified acc-sm tests. Tests can be run either with or without the acceptance-sm.sh (acc-sm.sh) wrapper script. Here are several examples:

To only run the RUNTESTS and SANITY.sh tests:

ACC_SM_ONLY=”RUNTESTS” sh acceptance-small.sh

- OR -

sh runtests

To only run test_1 and test_2 of the SANITY.sh tests:

ACC_SM_ONLY=”SANITYN” ONLY=”1 2” sh acceptance-small.sh

To only run the replay-single.sh test and except (not run) the test_3* and test_4* tests:


To only run the conf-sanity.sh script (without the acceptance-small.sh wrapper script):

CONF_SANITY_EXCEPT=”$ (seq 15) “ sh conf-sanity.sh

Do the acc-sm tests have to be run in a specific order?

The test order is defined in the acceptance-small.sh script and in each test script. Users do not have to (and should not) do anything to change the order of tests.

Who runs the acc-sm tests?

Currently, the QE group and Lustre developers run acc-sm as the main test suite for Lustre testing. Acc-sm tests are run on YALA, the automated test system, with test reports submitted to Buffalo (a web interface that allows for browsing various Lustre test results). We welcome external contributions to the Lustre acc-sm test efforts – either of the Lustre code base or new testing platforms.

What type of Lustre environment is needed to run the acc-sm tests? Is anything special needed?

The default Lustre configuration for acc-sm testing is 1 combined MGS/MDT, 1 OST and 1 client. Several clusters with this default configuration are available in YALA, the automated Lustre test system.

To run the acc-sm test suite on a non-default Lustre configuration, you have to modify the default settings in the acc-sm configuration file, lustre/tests/cfg/local.sh. The configuration variables include mds_HOST, ost_HOST, OSTCOUNT, MDS_MOUNT_OPTS and OST_MOUNT_OPTS, among others.

To create your own configuration file, copy cfg/local.sh to cfg/my_config.sh:

cp cfg/local.sh cfg/my_config.sh

Edit the necessary variables in the configuration file (my_config.sh) and run acc-sm.

What are the steps to run acc-sm?

There are two methods to run the acc-sm tests.

1. Check out a Lustre branch (b1_6, b1_8 or HEAD).

2. Change directory to lustre/tests:

cd lustre/tests

3. Run acc-sm on a local, default Lustre configuration (1 MGS/MDT, 1 OST and 1 client):

sh acceptance-small.sh 2>&1 | tee /tmp/output

- OR -

1. Install the lustre-tests RPM (available at lts-head:/var/cache/cfs/PACKAGE/rpm/lustre).

2. Change directory to lustre/tests:

cd /usr/lib/lustre/tests

3. Create your own configuration file and edit it for your configuration.

cp cfg/local.sh cfg/my_config.sh

4. Run acc-sm on a local Lustre configuration.

Here is an example of running acc-sm on a non-default Lustre configuration (MDS is sfire7, OST is sfire8, OSCOUNT=1, etc). In this example, only the SANITY test cases are being run.

ACC_SM_ONLY=SANITY mds_HOST=sfire7 ost8_HOST=sfire8 MDSDEV1=/dev/sda1
OSTCOUNT=1 OSTDEV1=/dev/sda1 MDSSIZE=5000000 OSTSIZE=5000000
MDS_MOUNT_OPTS="-o user_xattr" OST_MOUNT_OPTS=" -o user_xattr"
REFORMAT="--reformat" PDSH="pdsh -S -w" sh acceptance-small.sh

What if I hit a failure on an acc-sm test?

  • If you regularly hit a failure in any of these tests, check if a bug has been reported on the failure or file a new bug if one has not yet been opened.
  • If the bug prevents you from completing the tests, set the environment variables to skip the specific test(s) until you or someone else fixes them.
    • For example, to skip sanity.sh subtest 36g and 65, replay-single.sh subtest 42, and all of insanity.sh set in your environment:
      export SANITY_EXCEPT="36g 65"
      export REPLAY_SINGLE_EXCEPT=42
      export INSANITY=no
    • You can also skip tests on the command line. For example, when running acceptance-small:
      SANITY_EXCEPT="36g 65" REPLAY_SINGLE_EXCEPT=42 INSANITY=no ./acceptance-small.sh
    • The test framework is very flexible, and it is a very easy "hands-off" way of running testing while you are doing other things, like coding.
    • Questions/problems with the test framework should be emailed to the lustre-discuss mailing list, so all Lustre users can benefit from improving and documenting it.
  • If you do not run the entire test suite regularly, you will have no idea whether a bug is added from your code or not, and you will waste a lot of time looking.

How do you run acc-sm on a mounted Lustre system?

To run acc-sm on a Lustre system that is already mounted, you need to use the correct configuration file (according to the mounted Lustre system) and run acc-sm as:

SETUP=: CLEANUP=: FORMAT=: NAME=<config> sh acceptance-small.sh

How do you run acc-sm with and without reformat?

By default, the acc-sm test suite does not reformat Lustre. If you want to reformat Lustre, run acc-sm with REFORMAT="--reformat":

REFORMAT="--reformat" sh acceptance-small.sh

If needed, you can specify WRITECONF="writeconf", and then run acc-sm with WRITECONF="writeconf":

WRITECONF="writeconf" sh acceptance-small.sh

How do you run acc-sm in a Lustre configuration with several clients?

The default configuration file for acc-sm is cfg/local.sh, which uses only one client (local). To use additional remote clients, specify the RCLIENTS list and use the cfg/ncli.sh configuration file (or your own copy of ncli configuration).

NAME=ncli RCLIENT=<space-separated list of remote clients> sh acceptance-small.sh

For example:

NAME=ncli RCLIENT="client2 client3 client11" sh acceptance-small.sh

What is the SLOW variable and how is it used with acc-sm?

The SLOW variable is used to run a subset of acc-sm tests. By default, the variable is set to SLOW=no, which causes some of the longer acc-sm tests to be skipped and acc-sm test run to complete in less than 2 hours. To run all of the acc-sm tests, set the variable to SLOW=yes:

SLOW=yes sh acceptance-small.sh

What is the FAIL_ON_ERROR variable and how is it used with acc-sm?

The FAIL_ON_ERROR variable is used to "stop" or "continue" running acc-sm tests after a test failure occurs. If the variable is set to "true" (FAIL_ON_ERROR=true), then acc-sm stops after test_N fails and test_N+1 does not run. If the variable is set to "false" (FAIL_ON_ERROR=false), then acc-sm continues after test_N fails and test_N+1 does run.

FAIL_ON_ERROR=false sh acceptance-small.sh

What is the PDSH variable and how it is used with acc-sm?

The PDSH variable is used to provide remote shell access. If acc-sm is run on a Lustre configuration with remote servers, specify PDSH like this:

PDSH="pdsh -S w" sh acceptance-small.sh

If the client has no access to the servers, you can run acc-sm without PDSH, but the tests which need PDSH access are skipped. A summary report is generated which lists the skipped tests.

What is the CMD configuration for HEAD?

For the HEAD branch, specify the MDSCOUNT variable (number of MDTs). By default, the variable is set to 1. If you have a Lustre configuration with several MDT nodes, they need to be specified in the configuration file as mds1_HOST, mds2_HOST, ...

By default, all of these variables are set to the mds_HOST value.

What do we do with the acc-sm test results?

Acc-sm results are sent to Buffalo, a web interface for Lustre test results. The default Buffalo display shows a summary of tests run on different hardware configurations for various CVS branches for the past 24 hours, with links to the various reports. For more information on reporting test results to Buffalo, see Buffalizing Tests.

If an acc-sm test fails, then the failure is investigated. If the investigation reveals there is a Lustre defect, a bug is opened in Bugzilla to fix the problem.