Disk Performance

Sequential Write

dd if=/dev/zero of=/tmp/tempfile bs=1M count=1024 conv=fdatasync
:'
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.521978 s, 2.1 GB/s
'

Sequential Read » Clean Buffer

echo 'sync;echo 3 >/proc/sys/vm/drop_caches'|sudo bash
dd if=/tmp/tempfile of=/dev/null bs=1M count=1024
:'
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.978744 s, 1.1 GB/s
'

Sequential Read » Using Buffer

dd if=/tmp/tempfile of=/dev/null bs=1M count=1024
:'
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.151489 s, 7.1 GB/s
'

Benchmark Random Read & Write

iozone -t1 -i0 -i2 -r1k -s1g /tmp
-t  : Number of threads or processes to use in throughput test

-i  : Test to run
      0=write/rewrite    1=read/re-read      2=random-read/write  3=Read-backwards
      4=Re-write-record  5=stride-read       6=fwrite/re-fwrite   7=fread/Re-fread
      8=random_mix       9=pwrite/Re-pwrite 10=pread/Re-pread    11=pwritev/Re-pwritev  12=preadv/Re-preadv

-r  : record size in Kb
      k .. size in kB
      m .. size in MB
      g .. size in GB

-s  : file size in Kb
      k .. size in kB
      m .. size in MB
      g .. size in GB

/tmp: test path

Reclaim Disk Space

cat <<'EXE' | sudo bash
sh -c 'du -sh /var/lib/docker/containers/*'
sh -c 'truncate -s 0 /var/lib/docker/containers/*/*-json.log' 2>/dev/null

docker images -f 'dangling=true' -q
docker rmi $(docker images -f 'dangling=true' -q) 2>/dev/null

docker system  prune -f --volumes
docker builder prune -f -a
docker network prune -f
docker volume  prune -f

apt-get clean
apt-get autoclean
apt-get autoremove -y

journalctl --disk-usage
journalctl --vacuum-time=90d

find /tmp -type f -mtime +7
find /tmp -type f -mtime +7 -delete

find /var/log/nginx  -type f -mtime +90 
find /var/log/nginx  -type f -mtime +90 -delete
EXE

Playground

echo 'sync;echo 3 >/proc/sys/vm/drop_caches && swapoff -a && swapon -a'|sudo bash free -th		echo 'apt update;apt list --upgradable;apt upgrade'|sudo bash bottom
docker network prune -f docker volume prune -f docker system prune -f docker image ls	cat <<'EXE' | bash for d in system network volume do docker ${d} prune -f;done EXE	cat <<'EXE' | ssh deploy@ci.chorke.org for d in system network volume do docker ${d} prune -f;done EXE
cat <<'EXE' | sudo bash apt-get update;echo apt-get install -y iozone3 echo;iozone -v EXE	lsblk nvme0n1 259:0 0 953.9G 0 disk ├─nvme0n1p1 259:1 0 1G 0 part /boot/efi ├─nvme0n1p2 259:2 0 2G 0 part /boot └─nvme0n1p3 259:3 0 950.8G 0 part /

References

Linux » Free up RAM, Cache, Buffer & Swap Linux » Disk Encryption Slow Down Linux » Disk Performance Linux » LVM vs Partition Linux » Partition Label
SSH » Connection Hang Forever Ruby on Rails Free Up RAM TensorFlow Homebrew Linuxbrew PyEnv TMux CURL Tar	Macrium Reflect Alternatives Linux Mount Drive Fedora/Morefine Alpine/Morefine Linux Kernel Swap Space BIOS Menu Rescuezilla Fedora 7Zip	Linux » Copy files with SCP & Rsync Linux » Upload & Synchronize Files Fedora/Raspberry Pi