I have a couple of the SUA1500 units and they are awesome. The RS 1500 is a much lesser quality unit.
I would suggest running everything but the monitor off the SUA1500, and the monitor on the RS 1500.
The SUA1500 is quite capable of that load (mines seen higher w/o any glitches) and having all drives, controller, etc. on one common ground plane is much safer if you were to ever have a lightning stroke close by. Set your ARECA to use a 1 second delay for sequenced drive startup, or you could play with less (I think mine is 0.4 secs now). Then, you will never need a full current inrush of "startup" power for your drives (even if the Sans Digital tower is running all of the time.
First test done for RAID0 using five disks. I did this to approximate what I might see in a six-disk RAID3. I used xbench 1.3, since I don't know what else to use for disk speed testing.
Disk Test = 1431.45
Sequential = 907.07
- Write 4K blocks = 808.51 MB/sec
- Write 256K blocks = 1221.38 MB/sec
- Read 4K = 106.30 MB/sec
- Read 256K = 1158.14 MB/sec
Random = 3392.92
- Write 4K = 152.52 MB/sec
- Write 256K = 1256.89 MB/sec
- Read 4K = 101.80 MB/sec
- Read 256K = 1155.77 MB/sec
Seems pretty good to me. What do you all think? Should I use something else to test with?
Next up, six-disk RAID3 tests!
By the way, I secured the battery backup unit with a twist-tie to the GPU cables so that I would have an empty slot to run the internal / external (8087-8088) cable out to the tower. I have an eSATA card in the top slot, so I had to make room somehow, and wasn't keen to cut a hole in my case.
1 person found this helpful
If your 4k sequential read number is a typo (looks way low compared with other numbers), then things seem to be in order and ready to configure the "3".
If your 4k sequential read was reported correctly, then some more troubleshooting may be in order!
Not a typo. I was thinking it made sense since I set the block size to 128K, but I'm new to this so obviously I don't know jack, hahaha.
It's been building the RAID3 since a little after midnight last night, and now at 10:38am the initialization is at 25%. Here again, I thought that might be normal since the BBU was charging during that time as well. It's now 100% charged, and it seems to be initializing faster now, but who knows.
I read that thread about getting a 1200W UPS, and it seems like the Areca cards are taking longer than people expected. I did change up what's plugged into what, and I only have the Mac Pro and RAID tower plugged into the 980W UPS (SUA1500), and the monitors and external drives plugged into the 865W UPS (Back-UPS RS 1500). The load lights on the big UPS show only one of five lit up, which means 20% or less if I'm not mistaken. Occasionally, a second of five will light up for a half-second, then go out. On the smaller UPS with the two monitors running, it indicates 7% load. I'm pretty sure that means my UPS units are NOT overloaded or starving for power. I think something else is causing the long initialization time. All I can think of is that the BBU is still in its first 24 hours, and my rebuild priority is set to low.
I'm not too worried yet, since I have the weekend to get it all right.
I did only test five of the WD2003FYYS drives in RAID0, because the other three were already in use internally in the Mac Pro for a few months now. They're all eight identical model drives as noted above, but from three different purchases from two vendors... Provantage and Amazon. I set the drives as follows:
- Slots 1, 2 and 3 = RAID3
- Slot 4 = Hot Spare
- Slots 5, 6 and 7 = other half of RAID3 in enclosure 1
- Slot 8 = Hot Spare
My thinking here was that the six disk RAID3 would be better balanced by the use of both enclosures / cables to the Areca. I wonder if maybe it has to do with one half of the enclosure being connected to the external SFF-8088 port on the Areca, and the other being connected internally via the SFF-8087 port to SFF-8088 port cable.The documentation says the internal ports are preferred on the 1880ix-12. I might buy another internal-to-external cable and re-do it with that, skipping the external port completely.
In the time it took to type this, I'm now at 25.8% initialized, so it's moving along. Thanks for your input!
Edit: I also only have the standard 1GB of memory on the Areca, not 2GB or 4GB. The computer boots 2-3 times faster than it did with the old Apple RAID Card in there.
Edit 2: It's actually external slots 1-4 instead of internal slots 1-8. One half of the set are on slots 1-4, and slots 5-12 are empty.
It occurred to me that since this is an Areca 1880ix-12 (emphasis on the number 12 here), the extra four ports via the external SFF-8088 are sharing the internal ports somehow. I think that has to be related to why it's taking so long. I'm at 92.1% initialization completion after exactly 37 hours. I ordered another internal/external cable so I can avoid using the external port completely. I'm guessing that will mean I'll have to re-initialize this RAID3 set, but if I'm correct about the port sharing theory, it should only take the 6-12 hours I've heard so much about.
If anybody knows definitively about this issue, please feel free to let me know. Thanks!
If anyone cares, here are the results of disk speed tests on my three main volumes:
AJA tests: 1920x1080 10-bit, 16GB file write/read
- 640GB single internal drive (OS and programs) = 90MB/sec both write/read
- 3x1TB RAID 0 = 315MB/sec both write/read
- 6x2TB RAID 3 = 603MB/sec write, 550MB/sec read
You are correct on the 12 port version, you can have 12 internal disks, or 8 internal plus 4 external in the same array.
Update with two internal cables vs. one internal, one external:
AJA test @ 1920x1080 10-bit:
- 6x2TB RAID 3 = 625MB/sec write, 551MB/sec read
So, slight improvement, but probably just coincidence, not actually faster.