I have a Mac Mini I use as a home theater computer. Connected to it are 3 separate RAID sets (Set1, Set2, and Set3). All 3 sets are mirrored (RAID1), so there are 6 total hard drives -- Set1 is composed of 2x 2TB Hitachi HDDs, Set2 is 2x 2TB Seagates, and Set3 is 2x 3TB Western Digitals. Set1 and Set2 are housed in a Mediasonic ProBox 4-bay enclosure (USB 2.0 only), while Set3 is housed in a 2-bay Aukey enclosure (USB 3.0). All RAID sets were set up via Disk Utility, so all are formatted as Mac OS Journaled. Set1 and Set2 have been set up for about 5 years, while Set3 is relatively new. Everything is connected to the Mac via USB. I'm running the latest release of Yosemite (not Beta).
So now for the problem. When I try to copy files from Set1 to anything else (Mac Mini desktop, Set2, Set3, flash drive, etc.), the transfer essentially stops at about 400 MB into the job. The Finder transfer window doesn't close or crash, but it just seems frozen. The estimated time skyrockets. I'm able to push the X button to stop the transfer. The transfer rate when this happens isn't zero, but it might as well be -- it's like 1 MB per minute.
Weird thing is, I can copy files to Set1, just not from it. I've tried doing it with my Macbook Pro and i have the same problem, so it doesn't seem to be the computer. I can copy files from Set2 just fine (which is in the same HD enclosure), so it doesn't seem to be the enclosure. I've even tried physically swapping Set1 and Set2 to see if the bay connections were bad, but data transfers still slow to crawl at around 400 MB. I've tried different sized files, different types of files, restarting the computers and enclosures, rechecking connections... everything. I'm thoroughly stumped. Please help!
So now for the problem. When I try to copy files from Set1 to anything else (Mac Mini desktop, Set2, Set3, flash drive, etc.), the transfer essentially stops at about 400 MB into the job. The Finder transfer window doesn't close or crash, but it just seems frozen. The estimated time skyrockets. I'm able to push the X button to stop the transfer. The transfer rate when this happens isn't zero, but it might as well be -- it's like 1 MB per minute.
Weird thing is, I can copy files to Set1, just not from it. I've tried doing it with my Macbook Pro and i have the same problem, so it doesn't seem to be the computer. I can copy files from Set2 just fine (which is in the same HD enclosure), so it doesn't seem to be the enclosure. I've even tried physically swapping Set1 and Set2 to see if the bay connections were bad, but data transfers still slow to crawl at around 400 MB. I've tried different sized files, different types of files, restarting the computers and enclosures, rechecking connections... everything. I'm thoroughly stumped. Please help!