NFSSTAT(1M)NFSSTAT(1M)NAMEnfsstat - NFS statistics
SYNOPSISnfsstat [-cnrsza] [-T u | d ] [-v version] [interval [count]]
DESCRIPTIONnfsstat displays statistical information about the NFS and RPC (Remote
Procedure Call), interfaces to the kernel. It can also be used to
reinitialize this information. If no options are given the default is
The default displays everything, but reinitializes nothing.
Display NFS_ACL information.
Display client information. Only the client side NFS, RPC, and
NFS_ACL information is printed. Can be combined with the -n, -r,
and -a options to print client side NFS, RPC, and NFS_ACL informa‐
Display statistics for each NFS mounted file system. If pathname is
not specified, displays statistics for all NFS mounted file sys‐
tems. If pathname is specified, displays statistics for the NFS
mounted file systems indicated by pathname.
This includes the server name and address, mount flags, current
read and write sizes, the retransmission count, the attribute cache
timeout values, failover information, and the timers used for
dynamic retransmission. The dynamic retransmission timers are dis‐
played only where dynamic retransmission is in use. By default, NFS
mounts over the TCP protocols and NFS Version 3 mounts over either
TCP or UDP do not use dynamic retransmission.
If you specify the -m option, this is the only option that nfsstat
uses. If you specify other options with -m, you receive an error
message alerting that the -m flag cannot be combined with other
Display NFS information. NFS information for both the client and
server side are printed. Can be combined with the -c and -s options
to print client or server NFS information only.
Display RPC information.
Display server information.
-T u | d
Display a time stamp.
Specify u for a printed representation of the internal representa‐
tion of time. See time(2). Specify d for standard date format. See
Specify which NFS version for which to print statistics. When fol‐
lowed by the optional version argument, (2|3|4), specifies statis‐
tics for that version. By default, prints statistics for all ver‐
Zero (reinitialize) statistics. This option is for use by the super
user only, and can be combined with any of the above options to
zero particular sets of statistics after printing them.
The following operands are supported:
Display only count reports
Report once each interval seconds.
Specify the pathname of a file in an NFS mounted file system for
which statistics are to be displayed.
The server RPC display includes the following fields:
The total number of calls rejected by the RPC layer (the sum of
badlen and xdrcall as defined below).
The number of RPC calls with a length shorter than a minimum-sized
The total number of RPC calls received.
The number of RPC calls that looked up in the duplicate request
The number of RPC calls that were found to be duplicates.
The number of times an RPC call was not available when it was
thought to be received.
The number of RPC calls whose header could not be XDR decoded.
The server NFS display shows the number of NFS calls received (calls)
and rejected (badcalls), and the counts and percentages for the various
calls that were made.
The server NFS_ACL display shows the counts and percentages for the
various calls that were made.
The client RPC display includes the following fields:
The total number of RPC calls made.
The total number of calls rejected by the RPC layer.
The number of times the call failed due to a bad verifier in the
The number of times a reply from a server was received which did
not correspond to any outstanding call.
The number of times the call failed due to a failure to make a con‐
nection to the server.
The number of times a client was unable to send an RPC request over
a connectionless transport when it tried to do so.
The number of times the call was interrupted by a signal before
The number of times authentication information had to be refreshed.
The number of times the call failed due to a failure to allocate
The number of times a call had to be retransmitted due to a timeout
while waiting for a reply from the server. Applicable only to RPC
over connection-less transports.
The number of times a call timed out while waiting for a reply from
The number of times the calculated time-out value was greater than
or equal to the minimum specified time-out value for a call.
The client NFS display shows the number of calls sent and rejected, as
well as the number of times a CLIENT handle was received (clgets), the
number of times the CLIENT handle cache had no unused entries
(cltoomany), as well as a count of the various calls and their respec‐
The client NFS_ACL display shows the counts and percentages for the
various calls that were made.
The -m option includes information about mount flags set by mount
options, mount flags internal to the system, and other mount informa‐
tion. See mount_nfs(1M).
The following mount flags are set by mount options:
System V group id inheritance.
Interrupts allowed on hard mount.
Local locking being used (no lock manager).
Client is not caching attributes.
No interrupts allowed on hard mount.
No close-to-open consistency.
RPC time sync.
Read buffer size in bytes.
sec has one of the following values:
des-style authentication (encrypted timestamps).
kerberos v5-style authentication.
kerberos v5-style authentication with integrity.
kerberos v5-style authentication with privacy.
Short hand UNIX-style authentication.
UNIX-style authentication (UID, GID).
Initial NFS timeout, in tenths of a second.
Write buffer size in bytes.
The following mount flags are internal to the system:
Server supports NFS_ACL.
Server is down.
Dynamic transfer size adjustment.
Server supports links.
Mounted automatically by means of the mirrormount mechanism.
"Not responding" message printed.
Use readdir instead of readdirplus.
Server supports symbolic links.
The following flags relate to additional mount information:
The -m option also provides attribute cache timeout values. The follow‐
ing fields in -m ouput provide timeout values for attribute cache:
Maximum seconds to hold cached directory attributes.
Minimum seconds to hold cached directory attributes.
Maximum seconds to hold cached file attributes.
Minimum seconds to hold cached file attributes.
The following fields in -m output provide failover information:
Which server is currently providing NFS service. See the for addi‐
How many times a new server has been selected.
How many times servers have failed to respond.
How many times files have been re-evaluated to the new server.
The fields in -m output shown below provide information on dynamic
retransmissions. These items are displayed only where dynamic retrans‐
mission is in use.
Current backed-off retransmission value, in milliseconds.
Estimated deviation, in milliseconds.
The value for the smoothed round-trip time, in milliseconds.
The following exit values are returned:
An error occurred.
SEE ALSOmount_nfs(1M), attributes(5)
Jun 16, 2009 NFSSTAT(1M)