NFSSTAT(8) Maintenance Commands and Procedures NFSSTAT(8)

NAME

nfsstat - NFS statistics

SYNOPSIS

nfsstat [-cnrsza] [-T u | d ] [-v version] [interval [count]]


nfsstat -m [pathname]...

DESCRIPTION

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:


nfsstat -csnra


The default displays everything, but reinitializes nothing.

OPTIONS

-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 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
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.


-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 standard date
format. See date(1).


-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.

OPERANDS

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.

DISPLAYS

The server RPC display includes the following fields:

badcalls

The total number of calls rejected by the RPC layer (the sum of
badlen and xdrcall as defined below).


badlen

The number of RPC calls with a length shorter than a minimum-
sized RPC call.


calls

The total number of RPC calls received.


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.


nullrecv

The number of times an RPC call was not available when it was
thought to be received.


xdrcall

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:

calls

The total number of RPC calls made.


badcalls

The total number of calls rejected by the RPC layer.


badverfs

The number of times the call failed due to a bad verifier in the
response.


badxids

The number of times a reply from a server was received which did
not correspond to any outstanding call.


cantconn

The number of times the call failed due to a failure to make a
connection to the server.


cantsend

The number of times a client was unable to send an RPC request
over a connectionless transport when it tried to do so.


interrupts

The number of times the call was interrupted by a signal before
completing.


newcreds

The number of times authentication information had to be
refreshed.


nomem

The number of times the call failed due to a failure to allocate
memory.


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.


timeouts

The number of times a call timed out while waiting for a reply
from the server.


timers

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
respective percentages.


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. See mount_nfs(8).


The following mount flags are set by mount options:

grpid

System V group id inheritance.


hard

Hard mount.


intr

Interrupts allowed on hard mount.


llock

Local locking being used (no lock manager).


noac

Client is not caching attributes.


nointr

No interrupts allowed on hard mount.


nocto

No close-to-open consistency.


retrans

NFS retransmissions.


rpctimesync

RPC time sync.


rsize

Read buffer size in bytes.


sec

sec has one of the following values:

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.


none

No authentication.


short

Short hand UNIX-style authentication.


sys

UNIX-style authentication (UID, GID).


soft

Soft mount.


timeo

Initial NFS timeout, in tenths of a second.


wsize

Write buffer size in bytes.


The following mount flags are internal to the system:

acl

Server supports NFS_ACL.


down

Server is down.


dynamic

Dynamic transfer size adjustment.


link

Server supports links.


mirrormount

Mounted automatically by means of the mirrormount mechanism.


printed

"Not responding" message printed.


readdir

Use readdir instead of readdirplus.


symlink

Server supports symbolic links.


The following flags relate to additional mount information:

proto

Protocol.


vers

NFS version.


The -m option also provides attribute cache timeout values. The
following fields in -m output provide timeout values for attribute
cache:

acdirmax

Maximum seconds to hold cached directory attributes.


acdirmin

Minimum seconds to hold cached directory attributes.


acregmax

Maximum seconds to hold cached file attributes.


acregmin

Minimum seconds to hold cached file attributes.


The following fields in -m output provide failover information:

currserver

Which server is currently providing NFS service. See the for
additional details.


failover

How many times a new server has been selected.


noresponse

How many times servers have failed to respond.


remap

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
retransmission is in use.

cur

Current backed-off retransmission value, in milliseconds.


dev

Estimated deviation, in milliseconds.


srtt

The value for the smoothed round-trip time, in milliseconds.

EXIT STATUS

The following exit values are returned:

0

Successful completion.


>0

An error occurred.

SEE ALSO

attributes(7), mount_nfs(8)


June 16, 2009 NFSSTAT(8)