zfs tunables SSD

 ####

# ZFS tuning

# https://www.svennd.be/tuning-of-zfs-module/

###

echo > /etc/modprobe.d/zfs.conf

echo -e "\

# ---------------- BEGIN ----------------  \r

# ZFS tuning for SAS3 ALL SSD + nVME Storage Tank \r

# total arc size limited to 90% of free -m - factor is 1024  \r

# zfs_arc_max={{ '%d' | format(memtotal_mb*1024*1024*0.9) }} \r

options zfs zfs_arc_min=262144000000 \r

options zfs zfs_arc_max=283115520000 \r

options zfs zfs_compressed_arc_enabled=0 \r

###\r

# txg timeout \r

options zfs zfs_txg_timeout=5 \r

###\r

# disable prefetch \r

options zfs zfs_prefetch_disable=1 \r

###\r

# tune l2arc \r

# max write speed to l2arc \r

# default : 8 * 1024 * 1024 \r

# setting here : 500 * 1024 * 1024 \r

options zfs l2arc_write_max=524288000 \r

options zfs l2arc_write_boost=524288000 \r

options zfs l2arc_noprefetch=0 \r

options zfs l2arc_headroom=24 \r

###\r

# dirty pages \r

options zfs zfs_dirty_data_max_percent=40 \r

###\r

# sync zfs_vdev_* \r

# increase them so scrub/resilver is more quickly at the cost of other work \r

options zfs zfs_vdev_scrub_min_active=24 \r

options zfs zfs_vdev_scrub_max_active=64 \r

# sync write \r

options zfs zfs_vdev_sync_write_min_active=8 \r

options zfs zfs_vdev_sync_write_max_active=32 \r

# sync reads (normal) \r

options zfs zfs_vdev_sync_read_min_active=8 \r

options zfs zfs_vdev_sync_read_max_active=32 \r

# async reads : prefetcher \r

options zfs zfs_vdev_async_read_min_active=8 \r

options zfs zfs_vdev_async_read_max_active=32 \r

# async write : bulk writes \r

options zfs zfs_vdev_async_write_min_active=8 \r

options zfs zfs_vdev_async_write_max_active=32 \r

###\r

# scrub \r

options zfs zfs_top_maxinflight=320 \r

options zfs zfs_resilver_delay=0 \r

options zfs zfs_scrub_delay=0 \r

options zfs zfs_resilver_min_time_ms=5000 \r

###\r

# scheduler \r

options zfs zfs_vdev_scheduler=deadline \r

###\r

# cpu limits \r

options zfs zio_taskq_batch_pct=85 \r

options zfs zfs_sync_taskq_batch_pct=85 \r

###\r

# history \r

options zfs zfs_read_history=100 \r

options zfs zfs_read_history_hits=100 \r

options zfs zfs_txg_history=10 \r

###\r

# other tuning\r

options zfs zfs_nocacheflush=1 \r

###\r

# --------------- END ------------------" \

> /etc/modprobe.d/zfs.conf

cat /etc/modprobe.d/zfs.conf

/sbin/modprobe zfs

cat /proc/spl/kstat/zfs/arcstats