nfstest_dio man page

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

Packet trace options

--createtraces
Create a packet trace for each test
--tbsize=TBSIZE
Capture buffer size for tcpdump [default: '50000']
--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: 4096]
--wsize=WSIZE
Write size to use when writing files [default: 4096]
--iodelay=IODELAY
Seconds to delay I/O operations [default: 0.1]
--offset-delta=OFFSET_DELTA
Read/Write offset delta [default: 4096]

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: '/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: '']

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_xid(1), packet.nfs.nfs4_const(3)

Bugs

No known bugs.

Author

Jorge Mora (mora@netapp.com)

Referenced By

nfstest(1), 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_xid(1).

23 November 2015 NFStest 2.1.1 nfstest_dio 1.1