Tips and tricks for using diskspd especially useful for those familar with tools like fio
Continue readingMicrosoft diskspd Part 3. Oddities and FAQ
Tag: windows
Microsoft diskspd. Part 2 How to bypass NTFS Cache.
How to ensure performance testing with diskspd is stressing the underlying storage devices, not the OS filesystem.
Continue readingMicrosoft diskspd. Part 1 Preparing to test.
How to install and setup diskspd before starting your first performance tests and avoiding wrong results due to null byte issues.
Continue readingSpecifying Drive letters with fio for Windows.
Simple fio file for using Drive letters on Windows.
This will create a file called “fiofile” on the F:\ Drive in Windows. Notice that the specification is “Driveletter” “Backslash” “Colon” “Filename”
In fio terms we are “escaping” the “:” which fio traditionally uses as a file separator.
[global] bs=1024k size=1G time_based runtime=30 rw=read direct=1 iodepth=8 [job1] filename=F\:fiofile
To run IO to multiple drives (Add the group_reporting) flag to make the output more sane.
[global] bs=1024k size=1G time_based runtime=30 rw=read direct=1 iodepth=8 group_reporting [job1] filename=F\:fiofile [job2] filename=G\:fiofile
To use Physical Drives (Not formatted)
Use the format \\.\\PhysicalDrive<N>.
Firstly find the correct drive using diskpart -> list disk
DISKPART> list disk
Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 60 GB 0 B
Disk 1 Online 1024 GB 0 B *
Disk 2 Online 1024 GB 0 B *
Disk 3 Online 50 GB 0 B *
Disk 4 Online 50 GB 0 B *
Disk 5 Online 50 GB 0 B *
Disk 6 Online 50 GB 0 B *
Disk 7 Online 600 GB 1024 KB
Disk 8 Online 500 GB 1024 KB
Disk 9 Online 1024 GB 1024 KB
Disk 10 Online 77 GB 1024 KB
Then use the disk number you want in your fio file e.g.
[global] ioengine=windowsaio direct=1 time_based runtime=60s size=10g [log] rw=write bs=4k iodepth=1 filename=\\.\PhysicalDrive10