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Notes

To have reproducible results the aim should be to limit caching effects. For that:

  • Test data should be forced to storage and larger than flash drive's internal caches
  • Block caches should be emptied between tests

FIO

sudo apt update sudo apt install fio

Save this file as a job file called "chia.fio" or whatever you want, and change filename to the path of the drive or RAID volume that you want to test

[global]
bs=128K
iodepth=256
direct=1
ioengine=libaio
group_reporting
time_based
name=chia
log_avg_msec=1000
bwavgtime=1000
filename=/<yourRAID>/fiotest.tmp
size=100G

[rd_qd_256_128k_1w]
stonewall
bs=128k
iodepth=256
numjobs=1
rw=read
runtime=60
write_bw_log=seq_read_bw.log

[wr_qd_256_128k_1w]
stonewall
bs=128k
iodepth=256
numjobs=1
rw=write
runtime=60
write_bw_log=seq_write_bw.log

run sudo fio chia.fio

IOzone

This assumes RHEL stack Linux.

Install from sources​

sudo yum update -y
sudo yum groupinstall "Development Tools" -y
cd /opt
wget http://www.iozone.org/src/current/iozone3_490.tar
tar -xvf iozone3_490.tar
cd iozone3_490/src/current
make linux-AMD64

Run single threaded​

  • Assume the test drive or volume is mounted as /chia/scratch/disk01
  • -i 0=write/rewrite
  • -i 1=read/re-read
  • -i 2=random-read/write
  • -i 8=random_mix
  • -e Include flush (fsync,fflush) in the timing calculations
  • -r # record size in Kb
  • -s # file size in GB
  • -U Mount point to remount between tests, this option will clear the block caches between tests. For this to work, mounting of the disk/volume needs to be configured in /etc/fstab.
/opt/iozone3_490/src/current/iozone -e -r 256 -s 32G -i 0 -i 1 -i 2 -i 8 -f /chia/scratch/disk01/tfile -U /chia/scratch/disk01

Run multi threaded​

  • Assume the test drive or volume is mounted as /chia/scratch/disk01
  • -I Use DIRECT I/O for all file operations. Tells the filesystem that all operations are to bypass the buffer cache and go directly to disk. This also will use VX_DIRECT on VxFS, and O_DIRECT on Linux, and directio() on Solaris.