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ARCSTAT(1M)							   ARCSTAT(1M)

NAME
       arcstat - report ZFS ARC and L2ARC statistics

SYNOPSIS
       arcstat [-hvxr] [-f field[,field]...] [-o file] [-s string]
	     [interval [count]]

DESCRIPTION
       The  arcstat  utility  print  various  ZFS  ARC and L2ARC statistics in
       vmstat-like fashion.

       The arcstat command reports the following information:

       c
		     ARC Target Size

       dh%
		     Demand Data hit percentage

       dm%
		     Demand Data miss percentage

       mfu
		     MFU List hits per second

       mh%
		     Metadata hit percentage

       mm%
		     Metadata miss percentage

       mru
		     MRU List hits per second

       ph%
		     Prefetch hits percentage

       pm%
		     Prefetch miss percentage

       dhit
		     Demand Data hits per second

       dmis
		     Demand Data misses per second

       hit%
		     ARC Hit percentage

       hits
		     ARC reads per second

       mfug
		     MFU Ghost List hits per second

       mhit
		     Metadata hits per second

       miss
		     ARC misses per second

       mmis
		     Metadata misses per second

       mrug
		     MRU Ghost List hits per second

       phit
		     Prefetch hits per second

       pmis
		     Prefetch misses per second

       read
		     Total ARC accesses per second

       rmis
		     recycle_miss per second

       time
		     Time

       arcsz
		     ARC Size

       dread
		     Demand data accesses per second

       eskip
		     evict_skip per second

       miss%
		     ARC miss percentage

       mread
		     Metadata accesses per second

       pread
		     Prefetch accesses per second

       l2hit%
		     L2ARC access hit percentage

       l2hits
		     L2ARC hits per second

       l2miss
		     L2ARC misses per second

       l2read
		     Total L2ARC accesses per second

       l2size
		     Size of the L2ARC

       mtxmis
		     mutex_miss per second

       l2bytes
		     bytes read per second from the L2ARC

       l2miss%
		     L2ARC access miss percentage

       l2asize
		     Actual (compressed) size of the L2ARC

OPTIONS
       The following options are supported:

       -f
		   Display only specific fields. See DESCRIPTION for supported
		   statistics.

       -h
		   Display help message.

       -o
		   Report statistics to a file instead of the standard output.

       -s
		   Display  data  with	a specified separator (default: 2 spa‐
		   ces).

       -x

		   Print      extended	    stats      (same	   as	    -f
		   time,mfu,mru,mfug,mrug,eskip,mtxmis,rmis,dread,pread,read).

       -v
		   Show field headers and definitions

OPERANDS
       The following operands are supported:

       count
		   Display only count reports.

       interval
		   Specify the sampling interval in seconds.

AUTHORS
       arcstat	was originally written by Neelakanth Nadgir and supported only
       ZFS ARC statistics.  Mike Harsch updated it to  support	L2ARC  statis‐
       tics.

				  Feb 4, 2014			   ARCSTAT(1M)

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