diff options
| -rw-r--r-- | dynamicarcZFS.sh | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/dynamicarcZFS.sh b/dynamicarcZFS.sh new file mode 100644 index 0000000..536aa7b --- /dev/null +++ b/dynamicarcZFS.sh @@ -0,0 +1,39 @@ +#!/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 |