Content-type: text/html Man page of fsstat


Section: System Administration Commands (1M)
Updated: 25 July 2006
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fsstat - report file system statistics  


fsstat [-a|f|i|n|v] [-T | u|d] {-F | {fstype|path...}} [interval [count]]  


fsstat reports kernel file operation activity by the file system type (fstype) or by the path name, which is converted to a mount point. The first set of lines of output reports all activity since:

• The file system module was loaded (in the case of fstype)

• The file system was mounted (in the case of mount point)

Statistics are gathered at the file system independent layer at both the fstype and the mount point levels. However, not all file system types are represented in the gathering of statistics. (See the NOTES section of this man page.)

The output of fsstat is dependent on the mode (option) requested. All statistic fields are displayed using "smart numbers" which automatically scale the units in a human readable form that fits in a maximum of 5 characters. For example:

100 is displayed as 100

2048 is displayed as 2K

3000000 is displayed as 2.86M

The unit modifiers are: K (Kbyte), M (Mbyte), G (Gbyte), T (terabyte), P (petabyte), and E (exabyte).

During the execution of fsstat, the state of the system can change. If relevant, a state change message is included in the fsstat output in one of the following forms:

<<mount point no longer available: {path}>>
<<file system module no longer loaded: {fstype}>>

After the state change messages are displayed, fsstat continues to display the statistics as directed. If all of the fstypes and mount points that fsstat was reporting on are no longer available, then fsstat exits.

The user is required to specify the -F option (all available file system types) or a list of one or more fstypes and/or mount points.

The default report shows general file system activity. This display combines similar operations into general categories as follows:

new file Number of creation operations for file system objects (for example, files, directories, symlinks, etc.)

name remov Number of name removal operations

name chng Number of name change operations

attr get Number of object attribute retrieval operations

attr set Number of object attribute change operations

lookup ops Number of object lookup operations

rddir ops Number of read directory operations

read ops Number of data read operations

read bytes Bytes transferred by data read operations

write ops Number of data write operations

write bytes Bytes transferred by data write operations

The entity being reported on (fstype or mount point) is displayed in the last column.

If no operands (fstype or mount point) are specified, fsstat displays statistics for every loaded file system type available on the system.  


The following options are supported:

-a Report the activity for kernel attribute operations. The following statistics are reported:

getattr Number of file attribute retrieval calls

setattr Number of file attribute modification calls

getsec Number of file security attribute retrieval calls

setsec Number of file security attribute modification calls

The entity being reported on (fstype or mount point) is displayed in the last column.

-f Report the full activity for all kernel file operations. Each file operation is listed in the left column. The following statistics are reported for each operation:

#ops Number of calls for this operation

bytes Average transfer size in bytes (only applies to read, write, readdir)

The entity being reported on (fstype or mount point) is displayed in the first row if the -P option is not used. If the -P option is used, the entity is reported in the last column.

-i Reports the activity for kernel I/O operations. The following statistics are reported:

read ops Number of data read calls

read bytes Number of bytes read

write ops Number of data write calls

write bytes Number of bytes written

rddir ops Number of read directory calls

rddir bytes Number of bytes read by reading directories

rwlock ops Number of internal file system lock operations

rwulock ops Number of internal file system unlock operations

The entity being reported on (fstype or mount point) is displayed in the last column.

-n Reports the activity for kernel naming operations. The following statistics are reported:

lookup Number of file name retrieval calls

creat Number of file creation calls

remov Number of file remove calls

link Number of link calls

renam Number of file renaming calls

mkdir Number of directory creation calls

rmdir Number of directory removal calls

rddir Number of directory read calls

symlink Number of symlink creation calls

rdlink Number of symlink read calls

The entity being reported on (fstype or mount point) is displayed in the last column.

-v Reports the activity for calls to the virtual memory operations. The following statistics are reported.

map Number of calls mapping a file

addmap Number of calls setting additional mapping to a mapped file

delmap Number of calls deleting mapping to a file

getpag Number of calls retrieving a page of data from a file

putpag Number of calls writing a page of data to a file

pagio Number of calls to transfer pages in file system swap files

The entity being reported on (fstype or mount point) is displayed in the last column.

-F Report on all available file system types.

-T u|d Display a time stamp.

Specify u for a printed representation of the internal representation of time (see time(2)) Specify d for the standard date format. (See date(1)). The time stamp is only used when an interval is set.



The following operands are supported:

count Display only count reports.

fstype Explicitly specify the file system type(s) to be reported. The file system module must be loaded.

interval Report once each interval seconds.

path Specify the path(s) of the mount point(s) to be reported. If path is not a mount point, the mount point containing path will be determined and displayed in the output.

If no interval and no count are specified, a single report is printed and fsstat exits. If an interval is specified but no count is specified, fsstat prints reports every interval seconds indefinitely until the command is interrupted.  


Example 1: Displaying General Activity

The following example shows general activity for all file system types.

$ fsstat -F
 new  name   name  attr   attr lookup rddir  read read  write write
 file remov  chng   get    set    ops   ops   ops bytes   ops bytes
  313K  214K 38.5K 2.16M 56.2K  8.36M 52.8K 19.7M 39.9G 18.8M 39.1G ufs
     0     0     0 2.95K     0  3.81K   282 2.52K  466K     0     0 proc
     0     0     0     0     0      0     0     0     0     0     0 nfs
    10     8     2    86     9     98    15   413  103M 8.43K 1.05G zfs
    13    14     4    98    16    125    10 1.01K  258M 15.9K  127M lofs
8.73K 3.29K 5.25K 55.3K    37  1.20M    44 37.9K 38.3M 47.2K 35.9M tmpfs
     0     0     0 4.93K     0      0     0 1.08K  913K     0     0 mntfs
     3     2     1   503     3    897    13   122 25.8K   128  272K nfs3
    10     8     0   615    10  10.1K    18    61 45.6K   292 2.26M nfs4

Example 2: Displaying Naming Activity

The following example shows the naming activity for ufs, nfs, nfs3, nfs4, and tmpfs:

$ fsstat -n ufs nfs nfs3 nfs4 tmpfs

lookup creat remov  link renam mkdir rmdir rddir symlnk rdlnk
3.57M  3.10K   586     6    24   115   100 30.2K      5  330K ufs
    0      0     0     0     0     0     0     0      0     0 nfs
18.3K      3     5     0     0     0     0 1.03K      2   346 nfs3
  535      0     0     0     0     0     0    46      0     4 nfs4
  146     24    15     0     0     4     0     4      0     0 tmpfs

Example 3: Displaying Attribute Activity

The following example shows the attribute activity for the FS type ufs and the mounted file systems "/" and "/export/home" every three seconds for every third iteration:

# fsstat -a ufs / /export/home 3 3
getattr setattr getsec setsec
  378K    91.9K  11.8K      0 ufs
  367K    82.3K  11.6K      0 /
 11.3K     9.6K    198      0 /export/home
 4.97K    2.27K    163      0 ufs
 3.94K    1.36K    162      0 /
 1.03K      927      1      0 /export/home
 2.30K    1.06K     73      0 ufs
 1.95K      766     71      0 /
   361      317      2      0 /export/home
 2.33K    1.06K     78      0 ufs
 1.64K      451     77      0 /
   711      631      1      0 /export/home

Example 4: Displaying File Operation Statistics

The following example shows the statistics for each file operation for "/" (using the -f option):

$ fsstat -f /
Mountpoint: /
 operation  #ops  bytes
      open 8.54K
     close  9.8K
      read 43.6K  65.9M
     write 1.57K  2.99M
     ioctl 2.06K
     setfl     4
   getattr 40.3K
   setattr    38
    access 9.19K
    lookup  203K
    create   595
    remove    56
      link     0
    rename     9
     mkdir    19
     rmdir     0
   readdir 2.02K  2.27M
   symlink     4
  readlink 8.31K
     fsync   199
  inactive 2.96K
       fid     0
    rwlock 47.2K
  rwunlock 47.2K
      seek 29.1K
       cmp 42.9K
    frlock 4.45K
     space     8
    realvp 3.25K
   getpage  104K
   putpage 2.69K
       map 13.2K
    addmap 34.4K
    delmap 33.4K
      poll   287
      dump     0
  pathconf    54
    pageio     0
   dumpctl     0
   dispose 23.8K
getsecattr   697
setsecattr     0
   shrlock     0
   vnevent     0


See environ(5) for descriptions of the following environment variables that affect the execution of fsstat: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, LC_TIME, and NLSPATH.  


The following exit values are returned:

0 Successful completion.

1 A fatal error occurred. A fatal error could be a failed system call or another internal error.

2 Invalid command-line options were specified.



See attributes(5) for descriptions of the following attributes:

Interface StabilitySee below.

The command-line options are Unstable. The human-readable output is not considered an interface.  


date(1), time(2), attributes(5)  


All display options (-a, -f, -i, -n, -v) are mutually exclusive. Entering more than one of these options will result in an error.

The fstype and path operands must appear after the option, but before the interval or count on the command line. For example, "fsstat -a fstype interval". Preference is given to fstype so that if a user wishes to see the statistics for a directory that has the same name as an fstype (for example, ufs), then the path must be specified unambiguously (for example, ./ufs). Similarly, in order to define a file with a numeric name (for example, "10") from an interval or count operand, the name should be prefixed accordingly (for example, ./10).

When an interval is used, headers repeat after more than 12 lines of statistics have been displayed and the set of lines to be displayed in the current interval have completed.

Statistics are not displayed for all pseudo-filesystems. The output displayed with the -F option shows which of the loaded filesystem types are supported.

Unbundled file systems may not be recognized by fsstat.

The command-line options are classified as Unstable and could change. The output is not considered to be an interface. The construction of higher level software tools depend on either the command-line options or the output of fsstat is not recommended.




This document was created by man2html, using the manual pages.
Time: 02:37:01 GMT, October 02, 2010