# nfsiostat

## 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 contains statistics for the time
                  since each file system was mounted.  Each subsequent report
                  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**
    


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