System Administration Commands nfsstat(1M)
NAME
nfsstat - NFS statistics
SYNOPSIS
nfsstat [-cnrsza] [-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 NFSACL information.
-c
Display client information. Only the client side NFS,
RPC, and NFSACL information is printed. Can be combined
with the -n, -r, and -a options to print client side
NFS, RPC, and NFSACL 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 informa-
tion, 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
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System Administration Commands nfsstat(1M)
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, (234),
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
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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 dupli-
cates.
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.
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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 NFSACL 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 verif-
ier 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.
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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 NFSACL 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 mountnfs(1M).
The following mount flags are set by mount options:
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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
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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.
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The following mount flags are internal to the system:
acl
Server supports NFSACL.
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.
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vers
NFS version.
The -m option also provides attribute cache timeout values.
The following fields in -m ouput 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 informa-
tion:
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
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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 mil-
liseconds.
dev
Estimated deviation, in milliseconds.
srtt
The value for the smoothed round-trip time, in mil-
liseconds.
EXIT STATUS
The following exit values are returned:
0
Successful completion.
>0
An error occurred.
ATRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
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ATRIBUTE TYPE ATRIBUTE VALUE
Availability SUNWnfscu
SEE ALSO
mountnfs(1M), attributes(5)
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