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#!/bin/bash
# Config
MAX_ARC=$((32 * 1024 * 1024 * 1024)) # 32 GB
MIN_ARC=$((16 * 1024 * 1024 * 1024)) # 16 GB
UPPER_FREE=$((20 * 1024 * 1024)) # 20 GB in KB
LOWER_FREE=$((10 * 1024 * 1024)) # 10 GB in KB
ARC_SYS="/sys/module/zfs/parameters/zfs_arc_max"
# Function to get free memory in KB (Linux)
get_free_mem() {
awk '/MemAvailable/ {print $2}' /proc/meminfo
}
# Function to get current arc max
get_arc_max() {
cat $ARC_SYS
}
# Function to set arc max
set_arc_max() {
local val=$1
echo $val | sudo tee $ARC_SYS > /dev/null
}
while true; do
free_mem_kb=$(get_free_mem)
current_arc=$(get_arc_max)
if [ "$free_mem_kb" -lt "$LOWER_FREE" ] && [ "$current_arc" -gt "$MIN_ARC" ]; then
echo "Low memory ($free_mem_kb KB). Lowering ARC max to $MIN_ARC bytes."
set_arc_max $MIN_ARC
elif [ "$free_mem_kb" -gt "$UPPER_FREE" ] && [ "$current_arc" -lt "$MAX_ARC" ]; then
echo "High memory ($free_mem_kb KB). Raising ARC max to $MAX_ARC bytes."
set_arc_max $MAX_ARC
fi
sleep 60 # Check every 60 seconds
done
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