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ZARCSTAT(1) General Commands Manual ZARCSTAT(1) NAME zarcstat -- report ZFS ARC and L2ARC statistics SYNOPSIS zarcstat [-havxp] [-f field[,field]]a| [-o file] [-s string] [interval] [count] DESCRIPTION zarcstat prints various ZFS ARC and L2ARC statistics in vmstat-like fash- ion: c ARC target size dh% Demand hit percentage di% Demand I/O hit percentage dm% Demand miss percentage ddh% Demand data hit percentage ddi% Demand data I/O hit percentage ddm% Demand data miss percentage dmh% Demand metadata hit percentage dmi% Demand metadata I/O hit percentage dmm% Demand metadata miss percentage mfu MFU list hits per second mh% Metadata hit percentage mi% Metadata I/O hit percentage mm% Metadata miss percentage mru MRU list hits per second ph% Prefetch hits percentage pi% Prefetch I/O hits percentage pm% Prefetch miss percentage pdh% Prefetch data hits percentage pdi% Prefetch data I/O hits percentage pdm% Prefetch data miss percentage pmh% Prefetch metadata hits percentage pmi% Prefetch metadata I/O hits percentage pmm% Prefetch metadata miss percentage dhit Demand hits per second dioh Demand I/O hits per second dmis Demand misses per second ddhit Demand data hits per second ddioh Demand data I/O hits per second ddmis Demand data misses per second dmhit Demand metadata hits per second dmioh Demand metadata I/O hits per second dmmis Demand metadata misses per second hit% ARC hit percentage hits ARC hits per second ioh% ARC I/O hits percentage iohs ARC I/O hits per second mfug MFU ghost list hits per second mhit Metadata hits per second mioh Metadata I/O 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 pioh Prefetch I/O hits per second pmis Prefetch misses per second pdhit Prefetch data hits per second pdioh Prefetch data I/O hits per second pdmis Prefetch data misses per second pmhit Prefetch metadata hits per second pmioh Prefetch metadata I/O hits per second pmmis Prefetch metadata misses per second read Total ARC accesses per second time Current time size ARC size arcsz Alias for size unc Uncached list hits per second dread Demand accesses per second ddread Demand data accesses per second dmread Demand metadata accesses per second eskip evict_skip per second miss% ARC miss percentage mread Metadata accesses per second pread Prefetch accesses per second pdread Prefetch data accesses per second pmread Prefetch metadata accesses per second l2hit% L2ARC access hit percentage l2hits L2ARC hits per second l2miss L2ARC misses per second l2read Total L2ARC accesses per second l2pref L2ARC prefetch allocated size per second l2pref% L2ARC prefetch allocated size percentage l2mfu L2ARC MFU allocated size per second l2mfu% L2ARC MFU allocated size percentage l2mru L2ARC MRU allocated size per second l2mru% L2ARC MRU allocated size percentage l2data L2ARC data (buf content) allocated size per second l2data% L2ARC data (buf content) allocated size percentage l2meta L2ARC metadata (buf content) allocated size per second l2meta% L2ARC metadata (buf content) allocated size percentage l2size Size of the L2ARC mtxmis mutex_miss per second l2bytes Bytes read per second from the L2ARC l2wbytes Bytes written per second to the L2ARC l2miss% L2ARC access miss percentage l2asize Actual (compressed) size of the L2ARC cmpsz Compressed size cmpsz% Compressed size percentage ovhsz Overhead size ovhsz% Overhead size percentage bonsz Bonus size bonsz% Bonus size percentage dnosz Dnode size dnosz% Dnode size percentage dbusz Dbuf size dbusz% Dbuf size percentage hdrsz Header size hdrsz% Header size percentage l2hsz L2 header size l2hsz% L2 header size percentage abdsz ABD chunk waste size abdsz% ABD chunk waste size percentage datatg ARC data target datatg% ARC data target percentage datasz ARC data size datasz% ARC data size percentage metatg ARC metadata target metatg% ARC metadata target percentage metasz ARC metadata size metasz% ARC metadata size percentage anosz Anonymous size anosz% Anonymous size percentage anoda Anonymous data size anoda% Anonymous data size percentage anome Anonymous metadata size anome% Anonymous metadata size percentage anoed Anonymous evictable data size anoed% Anonymous evictable data size percentage anoem Anonymous evictable metadata size anoem% Anonymous evictable metadata size percentage mfutg MFU target mfutg% MFU target percentage mfudt MFU data target mfudt% MFU data target percentage mfumt MFU metadata target mfumt% MFU metadata target percentage mfusz MFU size mfusz% MFU size percentage mfuda MFU data size mfuda% MFU data size percentage mfume MFU metadata size mfume% MFU metadata size percentage mfued MFU evictable data size mfued% MFU evictable data size percentage mfuem MFU evictable metadata size mfuem% MFU evictable metadata size percentage mfugsz MFU ghost size mfugd MFU ghost data size mfugm MFU ghost metadata size mrutg MRU target mrutg% MRU target percentage mrudt MRU data target mrudt% MRU data target percentage mrumt MRU metadata target mrumt% MRU metadata target percentage mrusz MRU size mrusz% MRU size percentage mruda MRU data size mruda% MRU data size percentage mrume MRU metadata size mrume% MRU metadata size percentage mrued MRU evictable data size mrued% MRU evictable data size percentage mruem MRU evictable metadata size mruem% MRU evictable metadata size percentage mrugsz MRU ghost size mrugd MRU ghost data size mrugm MRU ghost metadata size uncsz Uncached size uncsz% Uncached size percentage uncda Uncached data size uncda% Uncached data size percentage uncme Uncached metadata size uncme% Uncached metadata size percentage unced Uncached evictable data size unced% Uncached evictable data size percentage uncem Uncached evictable metadata size uncem% Uncached evictable metadata size percentage grow ARC grow disabled need ARC reclaim needed free The ARC's idea of how much free memory there is, which in- cludes evictable memory in the page cache. Since the ARC tries to keep avail above zero, avail is usually more in- structive to observe than free. avail The ARC's idea of how much free memory is available to it, which is a bit less than free. May temporarily be negative, in which case the ARC will reduce the target size c. OPTIONS -a Print all possible stats. -f Display only specific fields. See "DESCRIPTION" for supported statis- tics. -h Display help message. -o Report statistics to a file instead of the standard output. -p Disable auto-scaling of numerical fields (for raw, machine-parsable values). -s Display data with a specified separator (default: 2 spaces). -x Print extended stats (same as -f time,mfu,mru,mfug,mrug,eskip,mtxmis,dread,pread,read). -v Show field headers and definitions OPERANDS The following operands are supported: interval Specify the sampling interval in seconds. count Display only count reports. FreeBSD ports 15.quarterly September 19, 2024 ZARCSTAT(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS
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