Anyone using an external RAID enclosure with USB-3

[ZackPlonk]

Hi,

After trying out a couple of combinations of enclosures (chipsets) and different computers, I have a theory that something is genuinely broken with some USB storage drivers. (see https://forums.macrumors.com/threads/instability-and-hangs-with-usb-3-uas-external-drives.2236237/)

If you are using external HDDs/SSDs via USB-3 it would be great if you could check if USB-Attached-SCSI (UAS) driver is being used? (in terminal, type ioreg | grep IOUSBMassStorageUASDriver and see if something turns up)

If UAS is being used it would be great if you could provide a few details on your setup
- type of enclosure (maybe the chipset; System Report can show this)
- does it support hosting more then one drive? Are you running any sort of RAIF configuration?
- any issues encountered so far?

Thanks!

 

[jackerin]

ioreg | grep IOUSBMassStorageUASDriver
    | |   |       |       |         +-o IOUSBMassStorageUASDriver  <class IOUSBMassStorageUASDriver, id 0x100000577, registered, matched, active, busy 0 (9 ms), retain 9>

Running an old, discontinued, Raidsonic IB-RD3219StU3, 2-bay enclosure set up in RAID 1. System info reports the code of the chip as Prolific PL2775. No issues, have had it for a long time with a variety of drives inside it, right now 2 x 4TB WD Red.

 

[ZackPlonk]

Thanks for the reply! So there are chips that are working - that's interesting information.
The page you linked says the enclosure uses an AS Media ASM1051 controller chipset. Maybe there are different versions of this enclosure around...