NFSTEST_ALLOC(1)

NAME
nfstest_alloc - Space reservation tests

SYNOPSIS
nfstest_alloc --server <server> [options]

DESCRIPTION
Verify correct functionality of space reservations so applications are able to reserve or unreserve space for a file. The system call fallocate is used to manipulate the allocated disk space for a file, either to preallocate or deallocate it. For filesystems which support the fallocate system call, preallocation is done quickly by allocating blocks and marking them as uninitialized, requiring no I/O to the data blocks. This is much faster than creating a file and filling it with zeros. Basic allocate tests verify the disk space is actually preallocated or reserved for the given range by filling up the device after the allocation and make sure data can be written to the allocated range without any problems. Also, any data written outside the allocated range will fail with NFS4ERR_NOSPC when there is no more space left on the device. On the other hand, deallocating space will give the disk space back so it can be used by either the same file on regions not already preallocated or by different files without the risk of getting a no space error. Performance testing using ALLOCATE versus initializing a file to all zeros is also included. The performance comparison is done with different file sizes. Some tests include testing at the protocol level by taking a packet trace and inspecting the actual packets sent to the server or servers. Negative testing is included whenever possible since some testing cannot be done at the protocol level because the fallocate system call does some error checking of its own and the NFS client won't even send an ALLOCATE or DEALLOCATE operation to the server letting the server deal with the error. Negative tests include trying to allocate an invalid range, having an invalid value for either the offset or the length, trying to allocate or deallocate a region on a file opened as read only or the file is a non-regular file type.

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: 4.2]

-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,rsize=4096,wsize=4096']

--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: 64k]

--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']

--perf-fsize=PERF_FSIZE
    Starting file size for the perf01 test [default: 1MB]

--perf-mult=PERF_MULT
    File size multiplier for the perf01 test, the tests are performed for a file size which is a multiple of the previous test file size [default: 4]

--perf-time=PERF_TIME
    Run the performance test perf01 until the sub-test for the current file size executes for more than this time [default: 15]

TESTS

  alloc
Run all ALLOCATE tests: alloc01, alloc02, alloc03, alloc04, alloc05,
alloc06

  alloc01
Verify ALLOCATE succeeds on files opened as write only

  alloc02
Verify ALLOCATE succeeds on files opened as read and write

  alloc03
Verify ALLOCATE fails on files opened as read only

  alloc04
Verify ALLOCATE fails with EINVAL for invalid offset or length

  alloc05
Verify ALLOCATE fails with ESPIPE when using a named pipe file handle

  alloc06
Verify ALLOCATE reserves the disk space

  dealloc
Run all DEALLOCATE tests: dealloc01, dealloc02, dealloc03, dealloc04,
dealloc05, dealloc06

  dealloc01
Verify DEALLOCATE succeeds on files opened as write only

  dealloc02
Verify DEALLOCATE succeeds on files opened as read and write

  dealloc03
Verify DEALLOCATE fails on files opened as read only

  dealloc04
Verify DEALLOCATE fails with EINVAL for invalid offset or length

  dealloc05
Verify DEALLOCATE fails with ESPIPE when using a named pipe file handle

  dealloc06
Verify DEALLOCATE unreserves the disk space

  perf01
Verify ALLOCATE outperforms initializing the file to all zeros

EXAMPLES
The only required option is --server
$ nfstest_alloc --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. Tests which require filling up all the disk space on the mounted device should have exclusive access to the device. Valid only for NFS version 4.2 and above.

SEE ALSO
formatstr(3), nfstest.test_util(3), nfstest.utils(3), nfstest_cache(1), nfstest_delegation(1), nfstest_dio(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)