NFSTEST_DIO(1)

NAME
nfstest_dio - Direct I/O tests

SYNOPSIS
nfstest_dio --server <server> [options]

DESCRIPTION
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.

OPTIONS

--version
    show program's version number and exit

-h, --help
    show this help message and exit

-f FILE, --file=FILE
    File where options are specified besides the system wide file /etc/nfstest, user wide file $HOME/.nfstest or in the current directory .nfstest file

  NFS specific options:

-s SERVER, --server=SERVER
    Server name or IP address

-e EXPORT, --export=EXPORT
    Exported file system to mount [default: '/']

--nfsversion=NFSVERSION
    NFS version, e.g., 3, 4, 4.1, etc. [default: 4.1]

-m MTPOINT, --mtpoint=MTPOINT
    Mount point [default: '/mnt/t']

-p PORT, --port=PORT
    NFS server port [default: 2049]

--proto=PROTO
    NFS protocol name [default: 'tcp']

--sec=SEC
    Security flavor [default: 'sys']

-o MTOPTS, --mtopts=MTOPTS
    Mount options [default: 'hard,intr']

--datadir=DATADIR
    Data directory where files are created, directory is created on the mount point [default: '']

  Logging options:

-v VERBOSE, --verbose=VERBOSE
    Verbose level for debug messages [default: 'none']

--tverbose=TVERBOSE
    Verbose level for test messages [default: '1']

--createlog
    Create log file

--rexeclog
    Create rexec log files

--warnings
    Display warnings

--tag=TAG
    Informational tag, it is displayed as an INFO message [default: '']

--notty
    Do not use terminal colors on output

  Packet trace options:

--createtraces
    Create a packet trace for each test

--tbsize=TBSIZE
    Capture buffer size for tcpdump [default: 192k]

--trcdelay=TRCDELAY
    Seconds to delay before stopping packet trace [default: 0.0]

--keeptraces
    Do not remove any trace files [default: remove trace files if no errors]

--rmtraces
    Remove trace files [default: remove trace files if no errors]

-i INTERFACE, --interface=INTERFACE
    Device interface [default: automatically selected]

  File options:

--nfiles=NFILES
    Number of files to create [default: 2]

--filesize=FILESIZE
    File size to use for test files [default: 262144]

--rsize=RSIZE
    Read size to use when reading files [default: 4k]

--wsize=WSIZE
    Write size to use when writing files [default: 4k]

--iodelay=IODELAY
    Seconds to delay I/O operations [default: 0.1]

--offset-delta=OFFSET_DELTA
    Read/Write offset delta [default: 4k]

  Path options:

--sudo=SUDO
    Full path of binary for sudo [default: '/usr/bin/sudo']

--tcpdump=TCPDUMP
    Full path of binary for tcpdump [default: '/usr/sbin/tcpdump']

--iptables=IPTABLES
    Full path of binary for iptables [default: '/usr/sbin/iptables']

--messages=MESSAGES
    Full path of log messages file [default: '/var/log/messages']

--tmpdir=TMPDIR
    Temporary directory [default: '/tmp']

  Debug options:

--nocleanup
    Do not cleanup created files

--bugmsgs=BUGMSGS
    File containing test messages to mark as bugs if they failed

--ignore
    Ignore all bugs given by bugmsgs

--nomount
    Do not mount server and run the tests on local disk space

--basename=BASENAME
    Base name for all files and logs [default: automatically generated]

--nfsdebug=NFSDEBUG
    Set NFS kernel debug flags and save log messages [default: '']

--rpcdebug=RPCDEBUG
    Set RPC kernel debug flags and save log messages [default: '']

--pktdisp
    Display main packets related to the given test

  Test options:

--runtest=RUNTEST
    Comma separated list of tests to run, if list starts with a '^' then all tests are run except the ones listed [default: 'all']

--iotype=IOTYPE
    List of I/O types to test [default: 'read,write']

--biotype=BIOTYPE
    List of buffered I/O types to test [default: 'none,read,write']

--withdeleg=WITHDELEG
    Use delegation on tests [default: both without and with delegation]

TESTS

  eof
Verify eof marker is handled correctly when reading the end
of the file.

  correctness
Verify data correctness when reading/writing using direct I/O.
File created with buffered I/O is read correctly with direct I/O.
File created with direct I/O is read correctly with buffered I/O.

  fstat
Verify fstat() gets correct file size after writing.

  read
Verify READ is sent after writing when the file is open for
both read and write.

  read_ahead
Verify READ is sent with only the requested bytes bypassing
read ahead.

  basic
Verify a packet is sent for each I/O request.

  rsize
Verify multiple READ packets are sent for each read request
having request size > rsize.

  wsize
Verify multiple WRITE packets are sent for each write request
having request size > wsize

  aligned
Verify packet is sent to correct DS server when using a memory
which is PAGESIZE aligned.

  nonaligned
Verify packet is sent to the MDS when using a memory which
is not PAGESIZE aligned.

  diffalign
Verify packets are sent to both the MDS and correct DS on same open
using buffers with different alignments.

  stripesize
Verify multiple packets are sent for each request having the
request size greater than stripe size.

  vectored_io
Verify vectored I/O functionality.

EXAMPLES
The only required option is --server
$ nfstest_dio --server 192.168.0.11

NOTES
The user id in the local host must have access to run commands as root using the 'sudo' command without the need for a password.

SEE ALSO
nfstest.test_util(3), nfstest_alloc(1), nfstest_cache(1), nfstest_delegation(1), nfstest_file(1), nfstest_interop(1), nfstest_io(1), nfstest_lock(1), nfstest_pkt(1), nfstest_pnfs(1), nfstest_posix(1), nfstest_sparse(1), nfstest_ssc(1), nfstest_xid(1), packet.nfs.nfs4_const(3)

BUGS
No known bugs.

AUTHOR
Jorge Mora (mora@netapp.com)