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zfsonlinux_stats_
Sadly there is no documentation for this plugin.
#!/usr/bin/env bash
# ZFS statistics for ZFSonLinux
# Author: Adam Michel (elfurbe@furbism.com)
#
# Description:
# This is a modification of the zfs_stats
# plugin by David Bjornsson (which was a
# rewrite of zfs-stats-for-freebsd scripts
# by patpro) modified to work with ZFSonLinux.
#
# Tested on Ubuntu-14.04
#
# Usage: zfs_stats_FUNCTION
#
# Available functions:
# efficiency - ARC efficiency
# cachehitlist - Cache hit by cache list
# cachehitdtype - Cache hit by data type
# dmuprefetch - DMU prefetch
# utilization - ARC size breakdown
# l2utilization - L2ARC size breakdown
# l2efficiency - L2ARC efficiency
#
#%# family=auto
FUNCTION=$(basename $0 | cut -d_ -f3)
MEMMAX=`cat /proc/meminfo | grep MemTotal | awk '{print $2}'`
BC='/usr/bin/bc -q'
ARCSTATS="/proc/spl/kstat/zfs/arcstats"
ZFETCHSTATS="/proc/spl/kstat/zfs/zfetchstats"
#
# Pull all values from arcstats
#
while read name type data
do
[[ $name =~ ^[0-9].* ]] && continue
[[ $name == "name" ]] && continue
[[ $name == "" ]] && continue
case $name in
"hits" )
export ARC_HITS=$data
;;
"misses" )
export ARC_MISSES=$data
;;
"p" )
export MRU_SIZE=$data
;;
"c_max" )
export MAX_SIZE=$data
;;
"c_min" )
export MIN_SIZE=$data
;;
"c" )
export TARGET_SIZE=$data
;;
* )
VARNAME=`echo $name | tr '[:lower:]' '[:upper:]'`
#declare $VARNAME=$data
export $VARNAME=$data
;;
esac
done < $ARCSTATS
#
# Pull all values from zfetchstats
#
while read name type data
do
[[ $name =~ ^[0-9].* ]] && continue
[[ $name == "name" ]] && continue
case $name in
"hits" )
export DMU_HITS=$data
;;
"misses" )
export DMU_MISSES=$data
;;
* )
VARNAME=`echo $name | tr '[:lower:]' '[:upper:]'`
export $VARNAME=$data
;;
esac
done < $ZFETCHSTATS
#
# Calculation macros
#
ANON_HITS=`echo "$ARC_HITS-($MFU_HITS+$MRU_HITS+$MFU_GHOST_HITS+$MRU_GHOST_HITS)" | $BC`
ARC_ACCESSES_TOTAL=`echo "$ARC_HITS+$ARC_MISSES" | $BC`
DEMAND_DATA_TOTAL=`echo "$DEMAND_DATA_HITS+$DEMAND_DATA_MISSES" | $BC`
PREFETCH_DATA_TOTAL=`echo "$PREFETCH_DATA_HITS+$PREFETCH_DATA_MISSES" | $BC`
REAL_HITS=`echo "$MFU_HITS+$MRU_HITS" | $BC`
if [ $ARC_ACCESSES_TOTAL != 0 ]; then
CACHE_HIT_RATIO_PERC=`echo "scale=2 ; (100*$ARC_HITS/$ARC_ACCESSES_TOTAL)" | $BC`
CACHE_MISS_RATIO_PERC=`echo "scale=2 ; (100*$ARC_MISSES/$ARC_ACCESSES_TOTAL)" | $BC`
ACTUAL_HIT_RATIO_PERC=`echo "scale=2 ; (100*$REAL_HITS/$ARC_ACCESSES_TOTAL)" | $BC`
else
CACHE_HIT_RATIO_PERC=0
CACHE_MISS_RATIO_PERC=0
ACTUAL_HIT_RATIO_PERC=0
fi
if [ $DEMAND_DATA_TOTAL != 0 ]; then DATA_DEMAND_EFFICIENCY_PERC=`echo "scale=2 ; (100*$DEMAND_DATA_HITS/$DEMAND_DATA_TOTAL)" | $BC`; else DATA_DEMAND_EFFICIENCY_PERC=0; fi
if [ $PREFETCH_DATA_TOTAL != 0 ]; then DATA_PREFETCH_EFFICENCY_PERC=`echo "scale=2 ; (100*$PREFETCH_DATA_HITS/$PREFETCH_DATA_TOTAL)" | $BC`; else DATA_PREFETCH_EFFICENCY_PERC=0; fi
if [ $ARC_HITS != 0 ]; then
ANONYMOUSLY_USED_PERC=`echo "scale=2 ; (100*$ANON_HITS/$ARC_HITS)" | $BC`
MOST_RECENTLY_USED_PERC=`echo "scale=2 ; (100*$MRU_HITS/$ARC_HITS)" | $BC`
MOST_FREQUENTLY_USED_PERC=`echo "scale=2 ; (100*$MFU_HITS/$ARC_HITS)" | $BC`
MOST_RECENTLY_USED_GHOST_PERC=`echo "scale=2 ; (100*$MRU_GHOST_HITS/$ARC_HITS)" | $BC`
MOST_FREQUENTLY_USED_GHOST_PERC=`echo "scale=2 ; (100*$MFU_GHOST_HITS/$ARC_HITS)" | $BC`
DEMAND_DATA_HIT_PERC=`echo "scale=2 ; (100*$DEMAND_DATA_HITS/$ARC_HITS)" | $BC`
PREFETCH_DATA_HIT_PERC=`echo "scale=2 ; (100*$PREFETCH_DATA_HITS/$ARC_HITS)" | $BC`
DEMAND_METADATA_HIT_PERC=`echo "scale=2 ; (100*$DEMAND_METADATA_HITS/$ARC_HITS)" | $BC`
PREFETCH_METADATA_HIT_PERC=`echo "scale=2 ; (100*$PREFETCH_METADATA_HITS/$ARC_HITS)" | $BC`
else
ANONYMOUSLY_USED_PERC=0
MOST_RECENTLY_USED_PERC=0
MOST_FREQUENTLY_USED_PERC=0
MOST_RECENTLY_USED_GHOST_PERC=0
MOST_FREQUENTLY_USED_GHOST_PERC=0
DEMAND_DATA_HIT_PERC=0
PREFETCH_DATA_HIT_PERC=0
DEMAND_METADATA_HIT_PERC=0
PREFETCH_METADATA_HIT_PERC=0
fi
if [ $ARC_MISSES != 0 ]; then
PREFETCH_METADATA_MISSES_PERC=`echo "scale=2 ; (100*$PREFETCH_METADATA_MISSES/$ARC_MISSES)" | $BC`
DEMAND_DATA_MISS_PERC=`echo "scale=2 ; (100*$DEMAND_DATA_MISSES/$ARC_MISSES)" | $BC`
PREFETCH_DATA_MISS_PERC=`echo "scale=2 ; (100*$PREFETCH_DATA_MISSES/$ARC_MISSES)" | $BC`
DEMAND_METADATA_MISS_PERC=`echo "scale=2 ; (100*$DEMAND_METADATA_MISSES/$ARC_MISSES)" | $BC`
else
PREFETCH_METADATA_MISSES_PERC=0
DEMAND_DATA_MISS_PERC=0
PREFETCH_DATA_MISS_PERC=0
DEMAND_METADATA_MISS_PERC=0
fi
DMU_TOTAL=`echo "$DMU_HITS+$DMU_MISSES" | $BC`
if [ $DMU_TOTAL != 0 ]; then
DMU_HITS_PERC=`echo "scale=2 ; (100*$DMU_HITS/$DMU_TOTAL)" | $BC`
DMU_MISSES_PERC=`echo "scale=2 ; (100*$DMU_MISSES/$DMU_TOTAL)" | $BC`
else
DMU_HITS_PERC=0
DMU_MISSES_PERC=0
fi
if [ $SIZE -gt $TARGET_SIZE ]; then
MFU_SIZE=`echo "$SIZE-$MRU_SIZE" | $BC`
else
MFU_SIZE=`echo "$TARGET_SIZE-$MRU_SIZE" | $BC`
fi
L2_ACCESSES_TOTAL=`echo "$L2_HITS+$L2_MISSES" | $BC`
if [ $L2_ACCESSES_TOTAL -gt 0 ]; then
L2_HIT_RATIO_PERC=`echo "scale=2 ; (100*$L2_HITS/$L2_ACCESSES_TOTAL)" | $BC`
L2_MISS_RATIO_PERC=`echo "scale=2 ; (100*$L2_MISSES/$L2_ACCESSES_TOTAL)" | $BC`
else
L2_HIT_RATIO_PERC=0
L2_MISS_RATIO_PERC=0
fi
efficiency() {
if [ "$1" = "config" ]; then
echo 'graph_title ZFS ARC Efficiency'
echo 'graph_args -u 100'
echo 'graph_vlabel %'
echo 'graph_info This graph shows the ARC Efficiency'
echo 'hits.label Hit Ratio'
echo 'misses.label Miss Ratio'
echo 'actual_hits.label Actual Hit Ratio'
echo 'data_demand_efficiency.label Data Demand Efficiency'
echo 'data_prefetch_efficiency.label Data Prefetch Efficiency'
exit 0
else
echo 'hits.value ' $CACHE_HIT_RATIO_PERC
echo 'misses.value ' $CACHE_MISS_RATIO_PERC
echo 'actual_hits.value ' $ACTUAL_HIT_RATIO_PERC
echo 'data_demand_efficiency.value ' $DATA_DEMAND_EFFICIENCY_PERC
echo 'data_prefetch_efficiency.value ' $DATA_PREFETCH_EFFICENCY_PERC
fi
}
cachehitlist() {
if [ "$1" = "config" ]; then
echo 'graph_title ZFS ARC Efficiency: Cache hits by cache list'
echo 'graph_args -u 100'
echo 'graph_vlabel %'
echo 'graph_info This graph shows the ARC Efficiency'
echo 'cache_list_anon.label Anonymously Used'
echo 'cache_list_most_rec.label Most Recently Used'
echo 'cache_list_most_freq.label Most Frequently Used'
echo 'cache_list_most_rec_ghost.label Most Recently Used Ghost'
echo 'cache_list_most_freq_ghost.label Most Frequently Used Ghost'
exit 0
else
echo 'cache_list_anon.value ' $ANONYMOUSLY_USED_PERC
echo 'cache_list_most_rec.value ' $MOST_RECENTLY_USED_PERC
echo 'cache_list_most_freq.value ' $MOST_FREQUENTLY_USED_PERC
echo 'cache_list_most_rec_ghost.value ' $MOST_RECENTLY_USED_GHOST_PERC
echo 'cache_list_most_freq_ghost.value ' $MOST_FREQUENTLY_USED_GHOST_PERC
fi
}
cachehitdtype() {
if [ "$1" = "config" ]; then
echo 'graph_title ZFS ARC Efficiency: Cache hits by data type'
echo 'graph_args -u 100'
echo 'graph_vlabel %'
echo 'graph_info This graph shows the ARC Efficiency'
echo 'data_type_demand_hits.label Demand Data Hit Ratio'
echo 'data_type_demand_misses.label Demand Data Miss Ratio'
echo 'data_type_prefetch_hits.label Prefetch Data Hit Ratio'
echo 'data_type_prefetch_misses.label Prefetch Data Miss Ratio'
echo 'data_type_demand_metadata_hits.label Demand Metadata Hit Ratio'
echo 'data_type_demand_metadata_misses.label Demand Metadata Miss Ratio'
echo 'data_type_prefetch_metadata_hits.label Prefetch Metadata Hit Ratio'
echo 'data_type_prefetch_metadata_misses.label Prefetch Metadata Miss Ratio'
exit 0
else
echo 'data_type_demand_hits.value ' $DEMAND_DATA_HIT_PERC
echo 'data_type_demand_misses.value ' $DEMAND_DATA_MISS_PERC
echo 'data_type_prefetch_hits.value ' $PREFETCH_DATA_HIT_PERC
echo 'data_type_prefetch_misses.value ' $PREFETCH_DATA_MISS_PERC
echo 'data_type_demand_metadata_hits.value ' $DEMAND_METADATA_HIT_PERC
echo 'data_type_demand_metadata_misses.value ' $DEMAND_METADATA_MISS_PERC
echo 'data_type_prefetch_metadata_hits.value ' $PREFETCH_METADATA_HIT_PERC
echo 'data_type_prefetch_metadata_misses.value ' $PREFETCH_METADATA_MISSES_PERC
fi
}
dmuprefetch() {
if [ "$1" = "config" ]; then
echo 'graph_title ZFS DMU prefetch stats'
echo 'graph_args -u 100'
echo 'graph_vlabel %'
echo 'graph_info This graph shows the DMU prefetch stats'
echo 'hits.label Hit Ratio'
echo 'misses.label Miss Ratio'
exit 0
else
echo 'hits.value ' $DMU_HITS_PERC
echo 'misses.value ' $DMU_MISSES_PERC
fi
}
utilization() {
if [ "$1" = "config" ]; then
echo 'graph_title ZFS ARC Size'
echo 'graph_args --base 1024 -l 0 --vertical-label Bytes --upper-limit '$MEMMAX
echo 'graph_vlabel Size in MB'
echo 'graph_info This graph shows the ARC Size utilization'
echo 'max_size.label Maximum Size'
echo 'max_size.draw AREA'
echo 'size.label Size'
echo 'size.draw AREA'
echo 'min_size.label Minimum Size'
echo 'min_size.draw AREA'
echo 'target_size.label Target Size'
echo 'target_size.draw LINE1'
echo 'recently_size.label Recently Used Cache Size'
echo 'recently_size.draw LINE1'
echo 'frequently_size.label Frequently Used Cache Size'
echo 'frequently_size.draw LINE1'
exit 0
else
echo 'max_size.value ' $MAX_SIZE
echo 'size.value ' $SIZE
echo 'min_size.value ' $MIN_SIZE
echo 'target_size.value ' $TARGET_SIZE
echo 'recently_size.value ' $MRU_SIZE
echo 'frequently_size.value ' $MFU_SIZE
fi
}
l2utilization() {
if [ "$1" = "config" ]; then
echo 'graph_title ZFS L2ARC Size'
echo 'graph_args --base 1024 -r -l 0 --vertical-label Bytes'
echo 'graph_vlabel Size in MB'
echo 'graph_info This graph shows the L2ARC Size utilization'
echo 'size.label Size'
echo 'size.draw AREA'
echo 'hdr_size.label Header Size'
echo 'hdr_size.draw AREA'
exit 0
else
echo 'size.value ' $L2_SIZE
echo 'hdr_size.value ' $L2_HDR_SIZE
fi
}
l2efficiency() {
if [ "$1" = "config" ]; then
echo 'graph_title ZFS L2ARC Efficiency'
echo 'graph_args -u 100'
echo 'graph_vlabel %'
echo 'graph_info This graph shows the L2ARC Efficiency'
echo 'l2_hits.label Hit Ratio'
echo 'l2_misses.label Miss Ratio'
else
echo 'l2_hits.value ' $L2_HIT_RATIO_PERC
echo 'l2_misses.value ' $L2_MISS_RATIO_PERC
fi
}
[ "$1" = "config" ] && echo "graph_category fs"
case "$FUNCTION" in
efficiency)
efficiency $1
;;
cachehitlist)
cachehitlist $1
;;
cachehitdtype)
cachehitdtype $1
;;
dmuprefetch)
dmuprefetch $1
;;
utilization)
utilization $1
;;
l2utilization)
l2utilization $1
;;
l2efficiency)
l2efficiency $1
;;
esac