# phpman > man > nfsiostat(8)

[nfsiostat(8)](https://www.chedong.com/phpMan.php/man/nfsiostat/8/markdown)                           System Manager's Manual                          [nfsiostat(8)](https://www.chedong.com/phpMan.php/man/nfsiostat/8/markdown)



## NAME
       nfsiostat - Emulate iostat for NFS mount points using /proc/self/mountstats

## SYNOPSIS
       **nfsiostat** **[[**_<interval>_**]** **[**_<count>_**]]** **[**_<options>_**][**_<mount_point>_**]**

## DESCRIPTION
       The **nfsiostat** command displays NFS client per-mount statisitics.

       <interval>
              specifies  the  amount  of time in seconds between each report.  The first report con‐
              tains statistics for the time since each file system was mounted.  Each subsequent re‐
              port contains statistics collected during the interval since the previous report.

       <count>
              If  the  _<count>_ parameter is specified, the value of _<count>_ determines the number of
              reports generated at _<interval>_ seconds apart. if the interval parameter is  specified
              without the _<count>_ parameter, the command generates reports continuously.

       <options>
              Define below

       <mount_point>
              If  one  or  more  _<mount_  _point>_ names are specified, statistics for only these mount
              points will be displayed.  Otherwise, all NFS mount points on the client are listed.

       The meaning of each column of **nfsiostat**'s output is the following:
               - **op/s**
                      This is the number of operations per second.
               - **rpc** **bklog**
                      This is the length of the backlog queue.
               - **kB/s**
                      This is the number of kB written/read per second.
               - **kB/op**
                      This is the number of kB written/read per each operation.
               - **retrans**
                      This is the number of retransmissions.
               - **avg** **RTT** **(ms)**
                      This is the duration from the time that client's kernel sends the RPC  request
                      until the time it receives the reply.
               - **avg** **exe** **(ms)**
                      This is the duration from the time that NFS client does the RPC request to its
                      kernel until the RPC request is completed, this includes the RTT time above.
               - **avg** **queue** **(ms)**
                      This is the duration from the time the NFS client created the RPC request task
                      to the time the request is transmitted.
               - **errors**
                      This is the number of operations that completed with an error status (status <
                      0).  This count is only available on kernels with RPC iostats version  1.1  or
                      above.

       Note  that  if an interval is used as argument to **nfsiostat**, then the diffrence from previous
       interval will be displayed, otherwise the results will be from the time that  the  share  was
       mounted.


## OPTIONS
### -a  or  --attr
              displays statistics related to the attribute cache

### -d  or  --dir
              displays statistics related to directory operations

### -h  or  --help
              shows help message and exit

### -l LIST or  --list=LIST
              only print stats for first LIST mount points

### -p  or  --page
              displays statistics related to the page cache

### -s  or  --sort
              Sort NFS mount points by ops/second

### --version
              show program's version number and exit

## FILES
### /proc/self/mountstats

## SEE ALSO
       [**iostat**(8)](https://www.chedong.com/phpMan.php/man/iostat/8/markdown), [**mountstats**(8)](https://www.chedong.com/phpMan.php/man/mountstats/8/markdown), [**nfsstat(8)](https://www.chedong.com/phpMan.php/man/nfsstat/8/markdown)**

## AUTHOR
       Chuck Lever <<chuck.lever@oracle.com>>



                                             15 Apr 2010                                [nfsiostat(8)](https://www.chedong.com/phpMan.php/man/nfsiostat/8/markdown)