CrystalDiskMark

最後更新: 2018-01-08

 


CLI

diskspd32 / diskspd64 = CrystalDiskMark 的 cli mode

CLI Usage

diskspd32.exe [options] target1

Opts:

  • -b<size>[K|M|G]       block size[default=64K]
  • -d<seconds>             duration (in seconds) to run test [default=10s]
  • -r<align>[K|M|G|b]    random I/O aligned to <align> in bytes/KiB/MiB ...
  • -v                             verbose mode
  • -t<count>                 number of threads per target

Write Test

-w<percentage>        Percentage of write requests (absence of this switch indicates 100% reads)
                                IMPORTANT: a write test will destroy existing data without a warning(file/drive !!)

-h                             disable both software caching and hardware "write" caching

-S                             disable software caching

Example

# Create 8192KB file and run read test on it for 1 second

diskspd32.exe -c8192K -d1 testfile.dat

# Create two 1GB files,

# set block size to 4KB,

# create 2 threads per file, affinitize threads

# (each file will have threads affinitized to both CPUs)

diskspd32.exe -c1G -b4K -t2 -d10 -a0,1 testfile1.dat testfile2.dat

 


Test inside VM

 

Read:

diskspd32.exe -c1G -d30 testfile.dat

Write:

diskspd32.exe -w100 -h -c2G -d30 testfile.dat

1.68 |      26.93    # io='threads'
4.89 |      78.32    # io='native'

Remark

當 cache='none' 時, 連 read 都勁慢

 


QxTy

 

Q = Queue Depth

= how many requests the drive has at one time.

= number of pending transactions to disk

QD 愈高, Latency 愈耐

  • desktop: <4
  • heavy io servers: ~16

T = Thread

how many processes are accessing the drive at once

CrystalDiskMark Test Mode

  • Q8T8
  • Q32T1
  • Q1T1

Total number of jobs = Q X T

Q8T8 = 8 * 8 = 64

 * SATA protocol is limited to just 32 => results may be off from expected

P.S.

NVMe can handle QD 65,000

SATA: NCQ(Native Command Queuing)

It allowing hard disk drives to internally optimize

the order in which received read and write commands are executed.

=> reduce the amount of unnecessary drive head movement


My test result

 

https://datahunter.org/hdd_speed

 

 


 

 

 

 

 

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