nfstest_io (1) Linux Manual Page
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]
- –write=WRITE
- Write file percentage [default: 40]
- –rdwr=RDWR
- Read/write file percentage [default: 20]
- –randio=RANDIO
- Random file access percentage [default: 50]
- –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]
- –odgrade=ODGRADE
- Open downgrade percentage [default: 10]
- –osync=OSYNC
- Open file with O_SYNC [default: 20]
- –fsync=FSYNC
- Percentage of fsync after write [default: 5]
- –rename=RENAME
- Rename file percentage [default: 5]
- –remove=REMOVE
- Remove file percentage [default: 5]
- –trunc=TRUNC
- Truncate file percentage [default: 5]
- –ftrunc=FTRUNC
- Truncate opened file percentage [default: 5]
- –link=LINK
- Create hard link percentage [default: 2]
- –slink=SLINK
- Create symbolic link percentage [default: 1]
- –readdir=READDIR
- List contents of directory percentage [default: 1]
- –lock=LOCK
- Lock file percentage [default: 20]
- –unlock=UNLOCK
- Unlock file percentage [default: 80]
- –tlock=TLOCK
- Lock test percentage [default: 50]
- –lockfull=LOCKFULL
- Lock full file percentage [default: 50]
- –minfiles=MINFILES
- Mininum 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]
Logging options:
- –createlog
- Create log file
- –createlogs
- Create a log file for each process
- –logdir=LOGDIR
- Log directory [default: ‘/tmp’]