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.