nfsstat(1M) System Administration Commands nfsstat(1M)
nfsstat - NFS statistics
nfsstat [-cnrsza] [-v version] [interval [count]]
nfsstat -m [pathname...]
nfsstat 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 as follows:
The default displays everything, but reinitializes nothing.
-a Display NFS_ACL information.
-c 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 information only.
-m [pathname...] Display statistics for each NFS mounted file system. If pathname is not specified, displays statistics for all NFS
mounted file systems. If pathname is specified, displays statistics for the NFS mounted file systems indicated by
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 displayed 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 options.
-n 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.
-r Display RPC information.
-s Display server information.
-v version Specify which NFS version for which to print statistics. When followed by the optional version argument, (2|3|4),
specifies statistics for that version. By default, prints statistics for all versions.
-z 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:
count Display only count reports
interval Report once each interval seconds.
pathname 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:
calls The total number of RPC calls received.
badcalls The total number of calls rejected by the RPC layer (the sum of badlen and xdrcall as defined below).
nullrecv The number of times an RPC call was not available when it was thought to be received.
badlen The number of RPC calls with a length shorter than a minimum-sized RPC call.
xdrcall The number of RPC calls whose header could not be XDR decoded.
dupchecks The number of RPC calls that looked up in the duplicate request cache.
dupreqs The number of RPC calls that were found to be duplicates.
The server NFS display shows the number of NFS calls received (calls) and rejected (badcalls), and the counts and percentages for the vari-
ous 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:
calls The total number of RPC calls made.
badcalls The total number of calls rejected by the RPC layer.
badxids The number of times a reply from a server was received which did not correspond to any outstanding call.
timeouts The number of times a call timed out while waiting for a reply from the server.
newcreds The number of times authentication information had to be refreshed.
badverfs The number of times the call failed due to a bad verifier in the response.
timers The number of times the calculated time-out value was greater than or equal to the minimum specified time-out value for a
cantconn The number of times the call failed due to a failure to make a connection to the server.
nomem The number of times the call failed due to a failure to allocate memory.
interrupts The number of times the call was interrupted by a signal before completing.
retrans 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.
cantsend The number of times a client was unable to send an RPC request over a connectionless transport when it tried to do so.
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 respective
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 information.
The following mount flags are set by mount options:
sec sec has one of the following values:
none No authentication.
sys UNIX-style authentication (UID, GID).
short Short hand UNIX-style authentication.
dh des-style authentication (encrypted timestamps).
krb5 kerberos v5-style authentication.
krb5i kerberos v5-style authentication with integrity.
krb5p kerberos v5-style authentication with privacy.
hard Hard mount.
soft Soft mount.
intr Interrupts allowed on hard mount.
nointr No interrupts allowed on hard mount.
noac Client is not caching attributes.
rsize Read buffer size in bytes.
wsize Write buffer size in bytes.
retrans NFS retransmissions.
timeo Initial NFS timeout, in tenths of a second.
nocto No close-to-open consistency.
llock Local locking being used (no lock manager).
grpid System V group id inheritance.
rpctimesync RPC time sync.
The following mount flags are internal to the system:
printed "Not responding" message printed.
down Server is down.
dynamic Dynamic transfer size adjustment.
link Server supports links.
symlink Server supports symbolic links.
readdir Use readdir instead of readdirplus.
acl Server supports NFS_ACL.
The following flags relate to additional mount information:
vers NFS version.
The -m option also provides attribute cache timeout values. The following fields in -m ouput provide timeout values for attribute cache:
acregmin Minimum seconds to hold cached file attributes.
acregmax Maximum seconds to hold cached file attributes.
acdirmin Minimum seconds to hold cached directory attributes.
acdirmax Maximum seconds to hold cached directory attributes.
The following fields in -m output provide failover information:
noresponse How many times servers have failed to respond.
failover How many times a new server has been selected.
remap How many times files have been re-evaluated to the new server.
currserver Which server is currently providing NFS service. See the System Administration Guide: IP Services for additional details.
The fields in -m output shown below provide information on dynamic retransmissions. These items are displayed only where dynamic retrans-
mission is in use.
srtt The value for the smoothed round-trip time, in milliseconds.
dev Estimated deviation, in milliseconds.
cur Current backed-off retransmission value, in milliseconds.
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWnfscu |
Solaris 10 Installation Guide: Basic Installations
System Administration Guide: IP Services
SunOS 5.10 25 Jul 2004 nfsstat(1M)