nfsstat(1M)

NAME

nfsstat — NFS statistics

SYNOPSIS

/bin/nfsstat [-cnrsmza]

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: nfsstat -csnra.

That is, display everything, but reinitialize 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

Display statistics for each NFS mounted file system. This includes the server name, mount flags, current read and write sizes, the retransmission count, the attribute cache timeout values, failover information, and the timers used for dynamic retransmission. Note that 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 nfsstat uses. Any options specified in addition to -m are checked for validity, then ignored.

-n

Display NFS information. NFS information for both the client and server side will be printed. Can be combined with the -c and -s options to print client or server NFS information only.

-r

Display RPC information. Can be combined with the -c and -s options to print client or server RPC information only.

-s

Display server information. Only the server side NFS, RPC, and NFS_ACL information is printed. Can be combined with the -n, -r, and -a options to print server side NFS, RPC, and NFS_ACL information only.

-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.

Displays

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 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.
badxid: 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.
newcred: 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 call.
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.
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 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(1M).

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).
dh: des-style authentication (encrypted timestamps).
krb5: kerberos v5-style authentication.
krb5i: krb5 kerberos v5-style authentication with integrity.
krb5p: krb5 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.

forcedirectio

Forced direct I/O being used for the duration of the 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).

public

Public handle being used.

grpid

System V group id inheritance.

rpctimesync

RPC time sync.

devs

Allow access to local devices.

nodevs

Do not allow access to local devices.

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.
novj: A private option used by the HP CIFS Client product only.

The following flags relate to additional mount information:

vers: NFS version.
proto: Protocol.

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 may times files have been re-evaluated to the new server.
currserver: Which server is currently providing NFS service.

The fields in -m output shown below provide information on dynamic retransmissions. Note that these items are displayed only where dynamic retransmission 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.

EXIT STATUS

The following exit values are returned:

0: Successful completion.
>0: An error occurred.

AUTHOR

nfsstat was developed by Sun Microsystems, Inc.

nfsstat(1M)

Technical documentation

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