nfstest_alloc (1) - Linux Manuals

nfstest_alloc: Space reservation tests

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

--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: 65536]

--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']

--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.

BUGS

No known bugs.

AUTHOR

Jorge Mora (mora [at] netapp.com)