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[zpool_iostat] improve formatting and variable names

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This commit is contained in:
Lars Kruse 2017-01-11 01:54:22 +01:00
parent 2ad0dfec78
commit aa9a39f043
1 changed files with 41 additions and 28 deletions
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69
plugins/zfs/zpool_iostat
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@ -58,58 +58,71 @@ if [ "$ACTION" = "autoconf" ]; then
fi
zlines=$("$ZPOOL_BIN" iostat -v | wc -l | sed 's/ //g')
pool_iostat=$("$ZPOOL_BIN" iostat -v 1 1 | tail "-$zlines")
zlist=$(echo "$pool_iostat" | gawk '/alloc/ {next}; /avail/ {next}; /raid/ {next}; /mirror/ {next}; { if ( $4 >=0 ) print $1}' | tr ' ' '\n')
iostats=$("$ZPOOL_BIN" iostat -v 1 1 | tail "-$zlines")
zlist=$(echo "$iostats" \
| gawk '/alloc/ {next}; /avail/ {next}; /raid/ {next}; /mirror/ {next};
{ if ( $4 >=0 ) print $1}' \
| tr ' ' '\n')
# parse the n'th column of the iostat output for a given pool as a number (interpreting K and M suffixes)
get_pool_iostat() {
local pool_label="$1"
# Parse the n'th column of the iostat output for a given pool or disk as a
# number (interpreting K and M suffixes).
get_device_iostat_column() {
local device_label="$1"
local stat_column="$2"
echo "$pool_iostat" \
| gawk '{ if ($1 == "'"$pool_label"'") print $'"$stat_column"'; }' \
| gawk '/M/ {print strtonum($1)*1000}; /K/ {print strtonum($1)}; /[0-9]$/ {print int($1)/1000}'
# convert all numeric values into kB
echo "$iostats" \
| gawk '{ if ($1 == "'"$device_label"'")
print $'"$stat_column"'; }' \
| gawk '/M/ {print strtonum($1)*1000};
/K/ {print strtonum($1)};
/[0-9]$/ {print int($1)/1000}'
}
get_pool_fieldname() {
local pool_id="$1"
# backwards compatibility (until 2016):
# keep the unprefixed pool name for the fieldname, except for pool names starting with digits
if echo "$pool_id" | grep -q "^[0-9]"; then
clean_fieldname "_$pool_id"
get_device_fieldname() {
local device_id="$1"
# Backwards compatibility (until 2016): keep the unprefixed pool name
# for the fieldname, except for pool names starting with digits.
if echo "$device_id" | grep -q "^[0-9]"; then
clean_fieldname "_$device_id"
else
clean_fieldname "$pool_id"
clean_fieldname "$device_id"
fi
}
if [ "$ACTION" = "config" ]; then
echo 'graph_title zpool iostat'
echo 'graph_args --base 1000 -l 0'
echo 'graph_vlabel write - read KBytes/s'
echo 'graph_vlabel write (-) / read (+) KBytes/s'
echo 'graph_category disk'
echo 'graph_scale no'
echo 'graph_info This graph shows zpool iostat'
# assemble the "graph_order" as a sorted list of read/write pairs for each poll
# Assemble the "graph_order" as a sorted list of read/write pairs for
# each device.
printf "graph_order"
echo "$zlist" | while read -r pool_id; do
fieldname="$(get_pool_fieldname "pool_$pool_id")"
echo "$zlist" | while read -r device_id; do
fieldname="$(get_device_fieldname "pool_$device_id")"
printf " %s_read %s_write" "$fieldname" "$fieldname"
done
# finalize the 'graph_order'
# finalize the 'graph_order' with a newline
echo
# output all fields: write as negative numbers and read as positive
echo "$zlist" | while read -r pool_id; do
fieldname="$(get_pool_fieldname "pool_$pool_id")"
echo "${fieldname}_read.label $pool_id"
echo "$zlist" | while read -r device_id; do
fieldname="$(get_device_fieldname "pool_$device_id")"
echo "${fieldname}_read.label $device_id"
echo "${fieldname}_read.type GAUGE"
echo "${fieldname}_read.graph no"
echo "${fieldname}_write.label $pool_id"
echo "${fieldname}_write.label $device_id"
echo "${fieldname}_write.type GAUGE"
echo "${fieldname}_write.negative ${fieldname}_read"
done
exit 0
fi
echo "$zlist" | while read -r pool_id; do
fieldname="$(get_pool_fieldname "pool_$pool_id")"
echo "${fieldname}_read.value $(get_pool_iostat "$pool_id" 6)"
echo "${fieldname}_write.value $(get_pool_iostat "$pool_id" 7)"
echo "$zlist" | while read -r device_id; do
fieldname="$(get_device_fieldname "pool_$device_id")"
echo "${fieldname}_read.value $(get_device_iostat_column "$device_id" 6)"
echo "${fieldname}_write.value $(get_device_iostat_column "$device_id" 7)"
done