I don't know whether this is he right forum - I suspect it's not. I wrote to support to OWC but I got a okie-doke answer.
I bought three of these OWC Dual Raid enclosures. https://eshop.macsales.com/item/OWC/MED3ER0GB/
I bought one first. It kept dropping offline. Maybe it's a security thing. But I use these for backup late at night when I'm seeping. I get back the next morning, or any time when I'm away for any length of time over an hour or two, a dialogue saying that the drive XYZ was closed improperly or something. I wrote OWC. They asked what the raid setting was. I told them and they just said. "Hm. I don't know."
So like a dummy I thought it was a bug in how I was setting things up. They were cheap and I needed two more. I've been collecting 2TB HDs, replaced by SSD, so it was perfect, I thought, to use the spinning drives as back up. I bought two more.
And they do exactly the same thing! SO . . . I've never run a raid system. These are only two drives per enclosure. Maybe (I hope) I AM doing something wrong. But the all just close and start on their own intermittently. If they're inactive they close and reopen and close. I suppose that's great to save the life of the drive, but SuperDuper ends up not backing them up at night.
I don't know what the setting should be. I'm using MacPro5,1 2009 3.46gz. Either Sierra 10.12.6 or Mojave 10.14.5. It looks like I have them all on Independent mode.
I bought three of these OWC Dual Raid enclosures. https://eshop.macsales.com/item/OWC/MED3ER0GB/
I bought one first. It kept dropping offline. Maybe it's a security thing. But I use these for backup late at night when I'm seeping. I get back the next morning, or any time when I'm away for any length of time over an hour or two, a dialogue saying that the drive XYZ was closed improperly or something. I wrote OWC. They asked what the raid setting was. I told them and they just said. "Hm. I don't know."
So like a dummy I thought it was a bug in how I was setting things up. They were cheap and I needed two more. I've been collecting 2TB HDs, replaced by SSD, so it was perfect, I thought, to use the spinning drives as back up. I bought two more.
And they do exactly the same thing! SO . . . I've never run a raid system. These are only two drives per enclosure. Maybe (I hope) I AM doing something wrong. But the all just close and start on their own intermittently. If they're inactive they close and reopen and close. I suppose that's great to save the life of the drive, but SuperDuper ends up not backing them up at night.
I don't know what the setting should be. I'm using MacPro5,1 2009 3.46gz. Either Sierra 10.12.6 or Mojave 10.14.5. It looks like I have them all on Independent mode.