Azure Disks Performance Tests: Ultra Disks compared

In a previous post, I showed you how to implement the new Azure Ultra Disks. Today, I want to show you how fast they really are by running performance tests and comparing them with the other disks available in Azure.

Test Environment

VM size: Standard D2s v3 (2 vcpus, 8 GiB memory)
Location: North Europe (Zone 3)
Used tool: DiskSpd

Disks Sizes
Ultra Disk: 32 GB / 9200 IOPS / 2000 MBps
Premium SSD: P4
Standard SSD: E4
Standard HDD: S4

Azure disks performance

I will perform two tests on each type of hard disk, using the Diskspd tool, Diskspd is a command-line utility and, as such, has a long list of available parameters. If you want to know more about the parameters used in the following tests, check out this link.

Large area random concurrent reads of 4KB blocks

The explanation of the values and parameters used for this test are the following:

Parameter Description
-c2G Create files of the specified size.
-b4K Block size in bytes or KB, MB, or GB.
-r Random I/O.
-o32 The number of outstanding I/O requests per-target per-thread.
-W60 Warmup time in seconds.
-d60 Duration of measurement period in seconds
-Sh Disable both software caching and hardware write caching.
testfile.dat  The target file used for testing.

The results for each type of Azure managed disks are shown below.

Ultra Disk

Azure Ultra disk performance

Premium SSD

Azure Premium Disks Performance

Standard SSD

Azure SSD Disks Performance

Standard HDD

Azure Standard Disks Performance

Small area concurrent writes of 4KB blocks

The explanation of the values and parameters used for this test are the following:

Parameter Description
-C100b Create files of the specified size.
-w100 Percentage of write requests to issue.
-b4K Block size in bytes or KB, MB, or GB.
-o32 The number of outstanding I/O requests per-target per-thread.
-F8 The total number of threads.
-T1b Stride size between I/O operations performed on the same target by different threads in bytes, KB, MB or GB.
-s8b Sequential stride size, offset between subsequent I/O operations in bytes, KB, MB, or GB.
-W60 Warmup time in seconds.
-d60 Duration of measurement period in seconds
-Sh Disable both software caching and hardware write caching.
testfile.dat  The target file used for testing.

The results for each type of Azure managed disks are shown below.

Ultra Disk

Azure Ultra Disks Performance

Premium SSD

Azure Premium Disks Performance

Standard SSD

Azure SSD Disks Performance

Standard HDD

Azure Standard Disks Performance

As you can see the difference in performance is notorious. I hope you find this information interesting and see you in the next post.

If you want to know more about DiskSpd tool, check out this link: https://github.com/Microsoft/diskspd/wiki/Command-line-and-parameters