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Mediasonic ProRaid H8R2-SU3S2 8 Bay 3.5" SATA Hard Drive External Hard Drive Enclosure - USB 3.0 & eSATA
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- Supports all brands of 3.5" SATA I/II/III hard disk drive up to 10TB per drive up to 8 x 10TB. Support hard drive transfer rate up to SATA III
- Switch USB 3.0 or eSATA interface by pressing one button; transfer rate of up to 5.0Gbps via USB 3.0, up to 3.0Gbps via eSATA. Compatible with Mac USB 3
- Raid Support: Raid 0 (Spanning) JBOD, Raid 0, Raid 50, 2 x Raid 0 (Spanning) JBOD, 2 x Raid 5 (Striped set with distributed parity), 2 x Raid 10 (Mirroring + Striping)
- Smart Fan comes with auto and manual modes, and three levels of speed for best convention. Power off in synchronization with PC
- eSATA interface requires Port Multiplier w/FIS-based switching on main computer to enable access to multiple HDDs simultaneously
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Mediasonic H8R2-SU3S2 PRORAID is a 8 Bay Raid Hard Drive Eclosure for 3.5" SATA hard disk drive. It has hardware embedded raid to support Raid 0 (Spanning) JBOD, Raid 0, Raid 50, 2 x Raid 0 (Spanning) JBOD, 2 x Raid 5 (Striped set with distributed parity), 2 x Raid 10 (Mirroring + Striping)
Seller Warranty Description1 Year Warranty from Mediasonic Store
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I bought two of this things to setup in 2xJBOD mode each one, width 4x3TB and 4x2TB hard drives on each one, which gives me 12TB and 8TB on each ProRaid.
The first problem was actually caused by one of the four WD Reds I bought. Even though SMART was telling me all four Reds where ok, one of the 3TB Red hard drives was broken, and had to be replaced. So, check the hard drives.
So, after changing the faulty Red, all was fine. I added 4x3TB hard drives on the top "layer" of each ProRaid (a ProRaid can be used in full or in half, and each half they call it a layer), and all was fine.
But when I tried to add the 4x2TB hard drives to the second layer of each ProRaid, one of the ProRaids would get into error mode and kinda freeze, and the other one would only let me use 2 of the 4 hard drives.
To make this review short, this is how you should really add the second layer if you haven't added all the hard drives at the same time the first time and you are having problems.
1) Turn OFF the ProRaid
2) Remove the hard drives from the original layer (that where rightly initialized, in my case it was the top layer)
3) Fill the non working layer with hard drives
4) Turn the ProRaid ON.
5) Press the "Change Modes" for 3 seconds to start the raid initialization.
6) Hold down the confirm button on the back until ProRaid turns OFF.
7) Turn the ProRaid ON. At this point, all 4 hard drives should be recognized perfectly.
8) Turn ProRaid OFF
9) Insert the original hard drives on the original (empty) layer.
10) Turn the ProRaid ON, and you should have all 8 hard drives recognized in 2 independent JBOD ARRAYS without loosing a single bit of the original array!
I used this same method for the second ProRaid I have, which, instead of only allowing me to use 2 of 4 hard drives on the 2nd layer, would actually give a hard drive error and go into "error mode".
The only difference is that steps 4, 5 and 6 have to be done more or less quickly, or the ProRaid would get innto "error/freeze mode".
NOTE: WHILE I DIDN'T LOST A SINGLE BIT OF INFORMATION FOLLOWING THIS METHOD, DO IT AT YOUR OWN RISK!
NOTE2: CREDIT HERE: http://forum.mediasonic.ca/viewtopic.php?f=27&t=1538&p=6944
however it is extremely noisy pumping out lots of RF noise. I have to turn it off when I wish to use my ham radio. in the attached picture you can clearly see when I turned off the Proraid, which sits on the other side of the room.
This is my third purchase of a Mediasonic Product and find them good quality for the cost.
Understand there is a cover on the back that has to be popped off so you can hold a button engaged to setup the RAID configuration you want to use.
I just placed an order for a 4 bay version ProRaid box.
As an aside, the documentation could be improved -- in my case I was not able to determine if I could use a mix of different size drives in SPN+ mode (I emailed support who gave me the answer).
I had a collection of identical Seagate 3TB hard drives that I'd pulled out of other devices or bought and had been saving for this RAID. First pass through, the unit would power up for 10 seconds and then shut down. Took a bit to figure out it HAS TO be connected to the USB port of a computer during setup. OK. Got all 8 drives in, got it powered up, had all the correct lights on the front panel but the computer refused to see it to initialize it. I assumed based on the doc and on experience that I'd have an indicator if one of the drives was bad. No problem indicators were lit but the computer couldn't see it.
I pulled out all the drives and started putting in smaller sets. The computer saw one combination of 4 drives. This says drive problem to me. Swapped drives around until I identified the bad drive. Got a replacement and all was well. Perhaps it'll help someone some day that a bad drive bricked the thing but it couldn't tell me it was a bad drive.
Read through posts on their forum. Saw a post about a "write fix" for RAID 50 which is what I am setting up. The post was dated 2012. I figured it likely would not apply to a unit I just bought. I was wrong. Transfer speeds were abysmal. Downloaded the utility and the new firmware. Went through the process of flashing the firmware on both controllers and again all is well. I'm getting transfer speeds 75 - 120\MB second on USB3.
So it's working and working well. I use this for back up of large amounts of video. It's a great value for the price.
I'd recommend this if you are comfortable going through the likely inevitable troubleshooting steps involved in setting this up. Helps to have dealt with similar before.