# Test Drive Performance [Windows / Linux]
## Test Sequential Read/Write with DD
Write
```
dd if=/dev/zero of=./largefile bs=1M count=12288
```
Read
```
dd if=./largefile of=/dev/null bs=4k
```
## Test IOPS with FIO
```
vim test.fio
```
> \[random\]
> rw=randread
> size=4g
> directory=./iops
> iodepth=403
> direct=1
> blocksize=4k
> numjobs=16
> nrfiles=1
> group\_reporting
> ioengine=sync
> loops=1
> rwmixread=75
```
mkdir ./iops
fio ./test.fio
```
## Test Windows Performance with DiskSpd
Download DiskSpd
[https://gallery.technet.microsoft.com/DiskSpd-A-Robust-Storage-6ef84e62](https://gallery.technet.microsoft.com/DiskSpd-A-Robust-Storage-6ef84e62)
Source code here: [https://github.com/microsoft/diskspd](https://github.com/microsoft/diskspd)
```
DiskSpd.exe -c150G -d300 -r -w40 -t8 -o32 -b64K -Sh -L D:\SpeedTest\testfile.dat
```
> **Parameters:**
>
> - -c150G – Create a file of the specified size. Size can be stated in bytes or **K**iBs, **M**iBs, **G**iBs. Here – 150GB.
> - -d300 – Duration of measurement period in seconds, not including cool-down or warm-up time (default = 10 seconds). Here – 5 minutes.
> - -r – Random I/O access (override -s).
> - -s – Sequential I/O access.
> - -w40 – Percentage of write requests to issue (default = 0, 100% read). Here 40% of IO operations are Writes, remaining 60% are Reads. This is a usual load for my SQL Server OLTP databases.
> - -t8 – The number of threads per file. Here – 8. One thread per available core.
> - -o32 – The number of outstanding I/O requests per target per thread. In other words, it is a queue depth. Here – 32.
> - -b46K – Block size in bytes or **K**iBs, **M**iBs, or **G**iBs. Here – 64KB.
> - -Sh – Disable both software caching and hardware write caching.
> - -L – Measure latency statistics.
> - D:\\SpeedTest\\testfile.dat – My target file used for testing (created with -c).