-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.
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.