Since my 2019 iMac has 2 40Gb TB3/USB-C ports…does anybody know if daisy chaining a TB3 OWC raid and a USB-C drive off a single port will slow either drive’s performance down. The RAID only does about 250MB/s according to BlackMagic disk speed test which is well below the 1500MB/s they claim on their web site…and I have no idea why that is. However, 250 MB/s is about 2000 Mb/s so adding the USB-C throughout to that is still well below the TB3 limit…unless the mix of USB and TB on a daisy chain slows things down…in which case I can put a USB-C hub on the second port and separate them.
On a related issue, anybody have an idea why the RAID isn’t faster? Yeah…I know the drives in it are 2.5 inch spinners and hence slower and I know the real world performance is never what the vendor claims…unless they found a specific speed test that is artificially fast…but only getting 1/6 of what the claim is somewhat disappointing…and I know my iMac isn’t a Pro or Mac Pro model… it it just seems like a big gap to me. I’ve got a note into OWC to ask but figured I would get more honest opinions here. The RAID has 4 3TB drives in it and is configured as RAID 5 with the latest version 6.03 of their SoftRAID software and is running under Big Sur.