Provided by: nfstest_3.2-2_all 
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']
--nconnect=NCONNECT
Multiple TCP connections option [default: '1']
-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: 'opts|info|dbg1|dbg2|dbg3']
--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
--isatty
Use terminal colors on output -- useful when running with nohup
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: 2.0]
--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']
--kill=KILL
Full path of binary for kill [default: '/usr/bin/kill']
--nfsstat=NFSSTAT
Full path of binary for nfsstat [default: '/usr/sbin/nfsstat']
--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']
--trcevents=TRCEVENTS
Full path of tracing events directory [default: '/sys/kernel/debug/tracing/events']
--trcpipe=TRCPIPE
Full path of trace pipe file [default: '/sys/kernel/debug/tracing/trace_pipe']
--tmpdir=TMPDIR
Temporary directory [default: '/tmp']
Debug options:
--nocleanup
Do not cleanup created files
--notimestamps
Do not display timestamps in debug messages
--bugmsgs=BUGMSGS
File containing test messages to mark as bugs if they failed
--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: '']
--tracepoints=TRACEPOINTS
List of trace points modules to enable [default: '']
--nfsstats
Get NFS stats [default: 'False']
--pktdisp
Display main packets related to the given test
--nfserrors
Fail every NFS error found in the packet trace
--client-ipaddr=CLIENT_IPADDR
IP address of localhost
Reporting options:
--xunit-report
Generate xUnit compatible test report
--xunit-report-file=XUNIT_REPORT_FILE
Path to xout report file
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.
all
Run all tests: eof, correctness, fstat, read, read_ahead, basic, rsize,
wsize, aligned, nonaligned, diffalign, stripesize, vectored_io
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
formatstr(3), nfstest.test_util(3), nfstest_alloc(1), nfstest_cache(1), nfstest_delegation(1),
nfstest_fcmp(1), nfstest_file(1), nfstest_interop(1), nfstest_io(1), nfstest_lock(1), nfstest_pkt(1),
nfstest_pnfs(1), nfstest_posix(1), nfstest_rdma(1), nfstest_sparse(1), nfstest_ssc(1), nfstest_xattr(1),
nfstest_xid(1), packet.nfs.nfs3_const(3), packet.nfs.nfs4_const(3)
BUGS
No known bugs.
AUTHOR
Jorge Mora (mora@netapp.com)
NFStest 3.2 21 March 2023 NFSTEST_DIO(1)