NAME

       nfstest_io - I/O tool

SYNOPSIS

       nfstest_io -d <datadir> [options]

DESCRIPTION

       This  I/O  tool  is used to create and manipulate files of different types.  The arguments
       allow running for a specified period of time as well as running multiple  processes.  Each
       process  modifies  a  single  file at a time and the file name space is different for each
       process so there are no collisions between two  different  processes  modifying  the  same
       file.

OPTIONS

       --version
              show program's version number and exit

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

       -d DATADIR, --datadir=DATADIR
              Top  level directory where files will be created, it will be created if it does not
              exist

       -s SEED, --seed=SEED
              Seed to initialized the random number generator [default: automatically generated]

       -n NPROCS, --nprocs=NPROCS
              Number of processes to use [default: 1]

       -r RUNTIME, --runtime=RUNTIME
              Run time [default: '0']

       -v VERBOSE, --verbose=VERBOSE
              Verbose level: none|info|debug|dbg1-7|all [default: 'none']

       -e, --exiterr
              Exit on first error

   Read and write:
       --read=READ
              Read file percentage [default: 40.0]

       --write=WRITE
              Write file percentage [default: 40.0]

       --rdwr=RDWR
              Read/write file percentage [default: 20.0]

       --randio=RANDIO
              Random file access percentage [default: 50.0]

       --iodelay=IODELAY
              Seconds to delay I/O operations [default: 0.0]

       --direct
              Use direct I/O

       --rdwronly
              Use read and write only, no rename, remove, etc.

   File operations:
       --create=CREATE
              Create file percentage [default: 5.0]

       --odgrade=ODGRADE
              Open downgrade percentage [default: 5.0]

       --osync=OSYNC
              Open file with O_SYNC [default: 10.0]

       --fsync=FSYNC
              Percentage of fsync after write [default: 2.0]

       --rename=RENAME
              Rename file percentage [default: 5.0]

       --remove=REMOVE
              Remove file percentage [default: 5.0]

       --trunc=TRUNC
              Truncate file percentage [default: 2.0]

       --ftrunc=FTRUNC
              Truncate opened file percentage [default: 2.0]

       --link=LINK
              Create hard link percentage [default: 1.0]

       --slink=SLINK
              Create symbolic link percentage [default: 0.2]

       --readdir=READDIR
              List contents of directory percentage [default: 0.5]

       --lock=LOCK
              Lock file percentage [default: 20.0]

       --unlock=UNLOCK
              Unlock file percentage [default: 80.0]

       --tlock=TLOCK
              Lock test percentage [default: 20.0]

       --lockfull=LOCKFULL
              Lock full file percentage [default: 50.0]

       --minfiles=MINFILES
              Minimum number of files to create before any file operation is  executed  [default:
              10]

   File size options:
       --fsizeavg=FSIZEAVG
              File size average [default: 1m]

       --fsizedev=FSIZEDEV
              File size standard deviation [default: 256k]

       --rsize=RSIZE
              Read block size [default: 64k]

       --rsizedev=RSIZEDEV
              Read block size standard deviation [default: 8k]

       --wsize=WSIZE
              Write block size [default: 64k]

       --wsizedev=WSIZEDEV
              Write block size standard deviation [default: 8k]

       --sizemult=SIZEMULT
              Size multiplier [default: 1.0]

   Logging options:
       --createlog
              Create log file

       --createlogs
              Create a log file for each process

       --logdir=LOGDIR
              Log directory [default: '/tmp']

SEE ALSO

       nfstest.file_io(3),     nfstest_alloc(1),     nfstest_cache(1),     nfstest_delegation(1),
       nfstest_dio(1),  nfstest_fcmp(1),  nfstest_file(1),  nfstest_interop(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)

BUGS

       No known bugs.

AUTHOR

       Jorge Mora (mora@netapp.com)