Thanks for all the answers Eric:-) I did have one question, and this was more related to ext3, and possible to xfstests. Is there a test suite for ext3 that tests the various corruption issues, bugs that have been detected, and has other tests as well? Kind of a suite that is run everytime a change is made. I know its a question about a very old filesys, if I should direct my question elsewhere, do let me know. Maybe the generic in xfstests is enough for that, I couldnt find ext3 specific tests for the harness anywhere else. Is there a separate Redhat test suite (assuming ext3 was being maintained by RH)? Is xfstests for ext4 basically used for ext4 for the question I asked about ext3 above? Thanks. On Wednesday, February 5, 2014 7:31 PM, Eric Sandeen <sandeen@xxxxxxxxxx> wrote: On 2/5/14, 9:12 PM, Mark Brown wrote: > Thanks Eric. > > I am looking at the README here: > http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/cmds/xfstests.git;a=blob_plain;f=README;hb=HEAD > > > Is this what you are referring to? It doesnt seem to have much information about the tests. Well, no, that's true. There's no great summary of the tests; buit each test in tests/*/??? should have at least a brief description at the top. There's also a tests/*/group file which has keywords for each test, so you can do i.e. ./check -g stress to run all tests tagged with "stress" > Should I look here? > http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/cmds/xfstests.git;a=tree;f=tests;h=a8535b21d5b45a7653bc0f4e2774d3b94871ba2e;hb=HEAD well, there you can see the entire history of changes, so ... sure! :) > > I did have some questions:-) > > 1. Do the tests do operations other than the POSIX operations? I see > different directories for xfs etc, which would imply it does some > filesys specific calls? yes; it's just a test harness, it can test whatever we like. Some of the xfs tests do test xfs-specific operations. Ditto for ext4 tests. Other tests are more generic. > 2. There are some other test tools like Iozone which have similar > functionality. Wanted to understand what the differences would be, in > using xfstests as opposed to them? iozone is a benchmark, not a test suite. It measures performance, not correctness. > 3. is xfstests more of a test suite geared for developers? Is it something a QA org can use Our QA organization makes good use of it, as do others. So, sure. And best of all it's open source so if your organization comes across a bug, you can submit a testcase, and the bug should never(tm) happen again. > 4. What I am looking for is a tool which I can use to stress the file > system a lot, do different operations etc, and make sure the data > written and metadata and the filesys itself is consistent by > verifying it at the end. You mentioned testing IO failures as well > and consistency is checked at the end. If you can point me to a few > tests that do the stress test and IO failures for the generic case, > that would really help, just to make sure i dont misunderstand the > tests when I am looking through the sources. Start by reading the tests themselves; for example, tests/generic/311: # Run various fsync tests with dm flakey in freeze() mode and non freeze() # mode. The idea is that we do random writes and randomly fsync and verify that # after a fsync() followed by a freeze()+failure or just failure that the file # is correct. We remount the file system after the failure so that the file # system can do whatever cleanup it needs to and md5sum the file to make sure # it matches hat it was before the failure. We also fsck to make sure the file # system is consistent. -Eric > Thanks:-) > > > > > > On Wednesday, February 5, 2014 6:01 PM, Eric Sandeen <sandeen@xxxxxxxxxx> wrote: > On 2/5/14, 5:20 PM, Mark Brown wrote: >> As an aside, I looked at xfstests, from what I could gather, it was >> started only for xfs, but there is ongoing work to make it work with >> ext4(and thus other posix FS?). If someone can point me to the >> documentation for xfstests and what it does, that would help. I could >> not find much. > > xfstests has gone pretty far beyond just xfs at this point - it's seen > heavy use on ext2/3/4 as well as btrfs in the past several years. > > There is a README in the git repo; did you have specific questions? > > We have a lot of tests in there; some are general stress tests, some > are specific regression tests, and the body of tests is always growing. > > Some test IO failures, as well. File system consistency is checked after > each test. Etc... > > -Eric > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
