RAID 0 problem with OWN EXPRESS 4M2

[mjoshi123]

I recently bought OWC Express $M2 to go with my Mac Studio MAX M1 - I bought 4 of this SSD

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I was assuming that when doing RAID 0 the speed would be faster compared to using singe SSD in TB 3 NVME Enclosure

This is what I'm getting in RAID 0

only difference I'm seeing is in READ speed - so is it SSD that is to fault or something else is wrong here ? Only thing I changed when doing RAID 0 is used 128KB instead of 32KB by default that was chosen - Aslo I've put 3 SSD in the enclosure instead of all 4 - seems like I dropped one of screw somewhere so cannot install - 4th one in enclosure yet. But does this make sense ?
Here is when done in TB3 enclosure for single SSD

 

[ColdCase]

So there is a single TB cable from the enclosure to the Studio and you are using softraid to raid the SSDs?

 

[mjoshi123]

So there is a single TB cable from the enclosure to the Studio and you are using softraid to raid the SSDs?

There is single TB4 cable that came along with the enclosure, so enclosure is directly connected to my M1 MAX Mac Studio in thunderbolt port. - I'm using Apple's RAID feature to create RAID 0 from Disk Utility

 

[ColdCase]

I'm sure someone will jump in here with more detail, but you are probably seeing TB/USB controller and enclosure overhead along with pipe size constraints. RAID0 in a JBOD is best suited for providing massive amounts of storage in a single volume without impacting data rates. Your performance is better and the volume is much larger.

If you want to maximize the studio's data rates, you would put those drives in their own enclosure and use all four studio ports. Thats a lot of clutter and points of failure for performance you probably wouldn't notice over the JBOD approach.

 

[tvv]

The express 4m2 dedicates one lane of PCIe to each of the four SSDs. Each lane is about 700-800 MB/s. So in order to get the full performance, you really should have four SSDs populated. That will be 4x lanes of PCIe gen 3 over Thunderbolt. Keep in mind that Thunderbolt 3/4 can only support 4x lanes of PCIe gen 3 total, not Gen 4.

It could also be your drives and their compatibility with MacOS. Different controllers and firmware behave with varying results in MacOS.