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-'\" te
-.\"
-.\" This file and its contents are supplied under the terms of the
-.\" Common Development and Distribution License ("CDDL"), version 1.0.
-.\" You may only use this file in accordance with the terms of version
-.\" 1.0 of the CDDL.
-.\" 
-.\" A full copy of the text of the CDDL should have accompanied this
-.\" source.  A copy of the CDDL is also available via the Internet at
-.\" http://www.illumos.org/license/CDDL.
-.\"
-.\" Copyright 2014 Joyent, Inc. All rights reserved.
-.\"
-.TH "VFSSTAT" "1m" "May 1, 2014" "" ""
-.
-.SH "NAME"
-\fBvfsstat\fR \-\- Report VFS read and write activity
-.
-.SH "SYNOPSIS"
-.
-.nf
-vfsstat [\-hIMrzZ] [interval [count]]
-.
-.fi
-.
-.SH "DESCRIPTION"
-The vfsstat utility reports a summary of VFS read and write
-activity per zone\.  It first prints all activity since boot, then
-reports activity over a specified interval\.
-.
-.P
-When run from a non\-global zone (NGZ), only activity from that NGZ
-can be observed\.  When run from a the global zone (GZ), activity
-from the GZ and all other NGZs can be observed\.
-.
-.P
-This tool is convenient for examining I/O performance as
-experienced by a particular zone or application\.  Other tools
-which examine solely disk I/O do not report reads and writes which
-may use the filesystem\'s cache\.  Since all read and write system
-calls pass through the VFS layer, even those which are satisfied
-by the filesystem cache, this tool is a useful starting point when
-looking at a potential I/O performance problem\.  The vfsstat
-command reports the most accurate reading of I/O performance as
-experienced by an application or zone\.
-.
-.P
-One additional feature is that ZFS zvol performance is also reported
-by this tool, even though zvol I/O does not go through the VFS
-layer\. This is done so that this single tool can be used to monitor
-I/O performance and because its not unreasonable to think of zvols
-as being included along with other ZFS filesystems\.
-.
-.P
-The calculations and output fields emulate those from iostat(1m)
-as closely as possible\.  When only one zone is actively performing
-disk I/O, the results from iostat(1m) in the global zone and
-vfsstat in the local zone should be almost identical\.  Note that
-many VFS read operations may be handled by the filesystem cache,
-so vfsstat and iostat(1m) will be similar only when most
-operations require a disk access\.
-.
-.P
-As with iostat(1m), a result of 100% for VFS read and write
-utilization does not mean that the VFS layer is fully saturated\.
-Instead, that measurement just shows that at least one operation
-was pending over the last interval of time examined\.  Since the
-VFS layer can process more than one operation concurrently, this
-measurement will frequently be 100% but the VFS layer can still
-accept additional requests\.
-.
-.SH "OUTPUT"
-The vfsstat utility reports the following information:
-.
-.IP "" 4
-.
-.nf
-r/s
-.RS
-reads per second
-.RE
-
-w/s
-.RS
-writes per second
-.RE
-
-kr/s
-.RS
-kilobytes read per second
-.RE
-
-kw/s
-.RS
-kilobytes written per second
-.RE
-
-ractv
-.RS
-average number of read operations actively being serviced by the VFS layer
-.RE
-
-wactv
-.RS
-average number of write operations actively being serviced by the VFS layer
-.RE
-
-read_t
-.RS
-average VFS read latency, in microseconds
-.RE
-
-writ_t
-.RS
-average VFS write latency, in microseconds
-.RE
-
-%r
-.RS
-percent of time there is a VFS read operation pending
-.RE
-
-%w
-.RS
-percent of time there is a VFS write operation pending
-.RE
-
-d/s
-.RS
-VFS operations per second delayed by the ZFS I/O throttle
-.RE
-
-del_t
-.RS
-average ZFS I/O throttle delay, in microseconds
-.RE
-.
-.fi
-.
-.IP "" 0
-.
-.SH "OPTIONS"
-The following options are supported:
-.
-.P
-\-h
-.RS
-Show help message and exit
-.RE
-.
-.P
-\-I
-.RS
-Print results per interval, rather than per second (where applicable)
-.RE
-.
-.P
-\-M
-.RS
-Print results in MB/s instead of KB/s
-.RE
-.
-.P
-\-r
-.RS
-Show results in a comma\-separated format
-.RE
-.
-.P
-\-z
-.RS
-Hide zones with no VFS activity
-.RE
-.
-.P
-\-Z
-.RS
-Print results for all zones, not just the current zone
-.RE
-.
-.SH "OPERANDS"
-interval
-.
-.P
-Specifies the length in seconds to pause between each interval
-report\.  If not specified, vfsstat will print a summary since boot
-and exit\.
-.
-.P
-count
-.
-.P
-Specifies the number of intervals to report\.  Defaults to
-unlimited if not specified\.
-.
-.SH "SEE ALSO"
-.
-.nf
-iostat(1m), ziostat(1m), mpstat(1m)
-.
-.fi
-.
-.SH "NOTES"
-This command does not examine readdir or any other VFS operations,
-only read and write operations\.
-.
-.P
-This command does not look at network I/O, only I/O operations to
-or from a file\.
-.
-.P
-The output format from vfsstat may change over time; use the
-comma\-separated output for a stable output format\.