nfsstat - NFS statistics
nfsstat [-cnrsza] [-T u | d ] [-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.
Display NFS_ACL information.
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.
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.
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.
Display RPC information.
Display server information.
Display a time stamp.
Specify which NFS version for which to print statistics. When followed by the optional version argument, (2, 3, 4, 4.0, 4.1), specifies statistics for that version. By default, prints statistics for all versions. '-v 4' will print statistics for both 4.0 and 4.1.
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:
Display only count reports
Report once each interval seconds.
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:
The total number of calls rejected by the RPC layer (the sum of badlen and xdrcall as defined below).
The number of RPC calls with a length shorter than a minimum-sized RPC call.
The total number of RPC calls received.
The number of RPC calls that looked up in the duplicate request cache.
The number of RPC calls that were found to be duplicates.
The number of times an RPC call was not available when it was thought to be received.
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:
The total number of RPC calls made.
The total number of calls rejected by the RPC layer.
The number of times the call failed due to a bad verifier in the response.
The number of times a reply from a server was received which did not correspond to any outstanding call.
The number of times the call failed due to a failure to make a connection to the server.
The number of times a client was unable to send an RPC request over a connectionless transport when it tried to do so.
The number of times the call was interrupted by a signal before completing.
The number of times authentication information had to be refreshed.
The number of times the call failed due to a failure to allocate memory.
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.
The number of times a call timed out while waiting for a reply from the server.
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:
Data transferred directly between client and server, with no buffering on client.
BSD group id inheritance. See description in mount_nfs(8).
Interrupts allowed on hard mount.
Local locking being used (no lock manager). Note that this is a private interface.
Client is not caching attributes.
No interrupts allowed on hard mount.
No close-to-open consistency.
RPC time sync.
Read buffer size in bytes.
sec has one of the following values:
des–style authentication (encrypted timestamps).
kerberos v5–style authentication.
kerberos v5–style authentication with integrity.
kerberos v5–style authentication with privacy.
Short hand UNIX–style authentication.
UNIX-style authentication (UID, GID).
Initial NFS timeout, in tenths of a second.
Write buffer size in bytes.
The following mount flags are internal to the system:
Server supports NFS_ACL.
Server is down.
Dynamic transfer size adjustment.
Server supports links.
Mounted automatically by means of the mirrormount mechanism.
“Not responding” message printed.
Use readdir instead of readdirplus.
Mounted automatically by means of the referral mechanism.
Server supports symbolic links.
The following flags relate to additional mount information:
NFSv4 minor version.
The –m option also provides attribute cache timeout values. The following fields in –m output provide timeout values for attribute cache:
Maximum seconds to hold cached directory attributes.
Minimum seconds to hold cached directory attributes.
Maximum seconds to hold cached file attributes.
Minimum seconds to hold cached file attributes.
The following fields in –m output provide failover information:
Which server is currently providing NFS service.
How many times a new server has been selected.
How many times servers have failed to respond.
How many times files have been re-evaluated to the new server.
The following fields in –m output provide RDMA transport information:
The transport plugin being used.
The fields in –m output shown below provide information on dynamic retransmissions. These items are displayed only where dynamic retransmission is in use.
Current backed-off retransmission value, in milliseconds.
Estimated deviation, in milliseconds.
The value for the smoothed round-trip time, in milliseconds.
The following exit values are returned:
An error occurred.
See attributes(7) for descriptions of the following attributes: