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| .\" 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 Adam Stevko. All rights reserved. |
| .\" Copyright (c) 2015 by Delphix. All rights reserved. |
| .\" Copyright (c) 2020 by AJ Jordan. All rights reserved. |
| .\" |
| .Dd May 26, 2021 |
| .Dt ARCSTAT 1 |
| .Os |
| . |
| .Sh NAME |
| .Nm arcstat |
| .Nd report ZFS ARC and L2ARC statistics |
| .Sh SYNOPSIS |
| .Nm |
| .Op Fl havxp |
| .Op Fl f Ar field Ns Op , Ns Ar field Ns … |
| .Op Fl o Ar file |
| .Op Fl s Ar string |
| .Op Ar interval |
| .Op Ar count |
| . |
| .Sh DESCRIPTION |
| .Nm |
| prints various ZFS ARC and L2ARC statistics in vmstat-like fashion: |
| .Bl -tag -compact -offset Ds -width "l2asize" |
| .It Sy c |
| ARC target size |
| .It Sy dh% |
| Demand data hit percentage |
| .It Sy dm% |
| Demand data miss percentage |
| .It Sy mfu |
| MFU list hits per second |
| .It Sy mh% |
| Metadata hit percentage |
| .It Sy mm% |
| Metadata miss percentage |
| .It Sy mru |
| MRU list hits per second |
| .It Sy ph% |
| Prefetch hits percentage |
| .It Sy pm% |
| Prefetch miss percentage |
| .It Sy dhit |
| Demand data hits per second |
| .It Sy dmis |
| Demand data misses per second |
| .It Sy hit% |
| ARC hit percentage |
| .It Sy hits |
| ARC reads per second |
| .It Sy mfug |
| MFU ghost list hits per second |
| .It Sy mhit |
| Metadata hits per second |
| .It Sy miss |
| ARC misses per second |
| .It Sy mmis |
| Metadata misses per second |
| .It Sy mrug |
| MRU ghost list hits per second |
| .It Sy phit |
| Prefetch hits per second |
| .It Sy pmis |
| Prefetch misses per second |
| .It Sy read |
| Total ARC accesses per second |
| .It Sy time |
| Current time |
| .It Sy size |
| ARC size |
| .It Sy arcsz |
| Alias for |
| .Sy size |
| .It Sy dread |
| Demand data accesses per second |
| .It Sy eskip |
| evict_skip per second |
| .It Sy miss% |
| ARC miss percentage |
| .It Sy mread |
| Metadata accesses per second |
| .It Sy pread |
| Prefetch accesses per second |
| .It Sy l2hit% |
| L2ARC access hit percentage |
| .It Sy l2hits |
| L2ARC hits per second |
| .It Sy l2miss |
| L2ARC misses per second |
| .It Sy l2read |
| Total L2ARC accesses per second |
| .It Sy l2pref |
| L2ARC prefetch allocated size per second |
| .It Sy l2pref% |
| L2ARC prefetch allocated size percentage |
| .It Sy l2mfu |
| L2ARC MFU allocated size per second |
| .It Sy l2mfu% |
| L2ARC MFU allocated size percentage |
| .It Sy l2mru |
| L2ARC MRU allocated size per second |
| .It Sy l2mru% |
| L2ARC MRU allocated size percentage |
| .It Sy l2data |
| L2ARC data (buf content) allocated size per second |
| .It Sy l2data% |
| L2ARC data (buf content) allocated size percentage |
| .It Sy l2meta |
| L2ARC metadata (buf content) allocated size per second |
| .It Sy l2meta% |
| L2ARC metadata (buf content) allocated size percentage |
| .It Sy l2size |
| Size of the L2ARC |
| .It Sy mtxmis |
| mutex_miss per second |
| .It Sy l2bytes |
| Bytes read per second from the L2ARC |
| .It Sy l2miss% |
| L2ARC access miss percentage |
| .It Sy l2asize |
| Actual (compressed) size of the L2ARC |
| .It Sy grow |
| ARC grow disabled |
| .It Sy need |
| ARC reclaim needed |
| .It Sy free |
| The ARC's idea of how much free memory there is, which includes evictable memory in the page cache. |
| Since the ARC tries to keep |
| .Sy avail |
| above zero, |
| .Sy avail |
| is usually more instructive to observe than |
| .Sy free . |
| .It Sy avail |
| The ARC's idea of how much free memory is available to it, which is a bit less than |
| .Sy free . |
| May temporarily be negative, in which case the ARC will reduce the target size |
| .Sy c . |
| .El |
| . |
| .Sh OPTIONS |
| .Bl -tag -width "-v" |
| .It Fl a |
| Print all possible stats. |
| .It Fl f |
| Display only specific fields. |
| See |
| .Sx DESCRIPTION |
| for supported statistics. |
| .It Fl h |
| Display help message. |
| .It Fl o |
| Report statistics to a file instead of the standard output. |
| .It Fl p |
| Disable auto-scaling of numerical fields (for raw, machine-parsable values). |
| .It Fl s |
| Display data with a specified separator (default: 2 spaces). |
| .It Fl x |
| Print extended stats |
| .Pq same as Fl f Sy time , Ns Sy mfu , Ns Sy mru , Ns Sy mfug , Ns Sy mrug , Ns Sy eskip , Ns Sy mtxmis , Ns Sy dread , Ns Sy pread , Ns Sy read . |
| .It Fl v |
| Show field headers and definitions |
| .El |
| . |
| .Sh OPERANDS |
| The following operands are supported: |
| .Bl -tag -compact -offset Ds -width "interval" |
| .It Ar interval |
| Specify the sampling interval in seconds. |
| .It Ar count |
| Display only |
| .Ar count |
| reports. |
| .El |
