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Topic starter
Hi I'm using a OSC Thunderbay 4 with a thunderbolt cable on my iMac and the black magic speed test says i'm getting 117 mb/s write and 247 mb/s read on a raid 5.
The drives are all 4tb seagate ironwolf drives.
are these speeds normal?
Posted : 22/02/2023 12:26 pm
Are you using the latest Black Magic?
No, these are not normal.
Posted : 22/02/2023 12:27 pm
Topic starter
I'm using Disk Speed Test v3.4.2 from the App Store.
Posted : 23/02/2023 3:22 pm
You need to use the latest Black Magic Speed test, or AJA System test (I can give you the settings, but not the AJA app store version, it gives incorrect reslts on M series Macs)
Posted : 23/02/2023 6:58 pm
Topic starter
I downloaded the latest version of Disk Speed test v3.4.2 from the Blackmagic website and ran the test again.
It came up the same. 168 MB/s write, 223 MB/s read. Any other suggestions?
(Also, i'm using an intel iMac. Not Apple Silicon.)
This post was modified 3 years ago by chrisle
Posted : 24/02/2023 5:42 am
Topic starter
I downloaded the latest version of the AJA system test form the apple store and it's reading 210 Mb/s write, 318 Mb/s read.
Posted : 28/02/2023 11:39 am
@chrisle
these seem like terrible numbers. Please attach a SoftRAID technical support file, so I can look deeper. How much data is on this volume?
Posted : 28/02/2023 1:23 pm
Topic starter
@softraid-support Do i generate a report for tech support then attach it here? Or should i send it privately to someone else?
Posted : 15/03/2023 6:41 am
You can attach it here. thanks
BTW: you need to test with the version bundled with AJA software. the Lite app on the store gives terrible results on M1 in particular.
https://www.aja.com/products/kona-5#support
Only install the Kona component, and it will install AJA System Test. You can delete the Kona app.
Run AJA, set resolution to any 5K video, Codec to 16bitRGBA, and filesize to 16GB or 64GB. In settings, check "Dual DMA engine".
See what results you get.
This post was modified 3 years ago 2 times by SoftRAID Support
Posted : 15/03/2023 1:36 pm
Topic starter
Posted : 17/03/2023 4:02 pm
Let me know what you see with AJA. You should have much better numbers.
Posted : 17/03/2023 5:32 pm
Topic starter
The read is better. Are these numbers expected?
I'm on a 3.6GHz 8-core Intel i9 iMac 5k, 27" from 2019.
The OWC is connected to the thunderbolt port on the back of the machine. I think it's a 6' passive cable which i think is 20gbits a second?
This post was modified 3 years ago 2 times by chrisle
Posted : 17/03/2023 7:12 pm
Topic starter
The OWC has four disks in it. All four of them are 4TB Seagate IronWolf drives that are less than 1 year old each in RAID 5.
Posted : 17/03/2023 7:19 pm
Bo, this is way too slow. the computer is i9, which should generate plenty of parity calculations to give faster write performance. Read performance is slow also.
Is this a "new" volume where you can reconfigure it for tests? then we can try to figure out where this performance is coming from.
Posted : 18/03/2023 1:29 am
Topic starter
@softraid-support This is what I had setup the day I bought it. I added the drives and then configured it this way and I currently use it daily.
Posted : 20/03/2023 10:26 am
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