Provided by: zfsutils-linux_2.1.5-1ubuntu6_amd64
arcstat — report ZFS ARC and L2ARC statistics
arcstat [-havxp] [-f field[,field…]] [-o file] [-s string] [interval] [count]
arcstat prints various ZFS ARC and L2ARC statistics in vmstat-like fashion: 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 time Current time size ARC size arcsz Alias for 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 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 l2miss% L2ARC access miss percentage l2asize Actual (compressed) size of the L2ARC grow ARC grow disabled need ARC reclaim needed 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 avail above zero, avail is usually more instructive 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.
-a Print all possible stats. -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. -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
The following operands are supported: interval Specify the sampling interval in seconds. count Display only count reports.