With 8 ports available your choices are somewhat limited, but then your budget for the drives is adequate.
You did not mention how much storage space you need, so I will assume 6 or 12 TB net space is enough for your purposes.
If 6 TB is enough, you could look at Seagate Constellation ES 1 TB disks and keep the rest of your budget for the future, if you need 12 TB you could look at HGST Ultrastar or Seagate Constellation 2 TB disks. I would only suggest enterprise drives.
With 8 ports I would configure them as 7 x raid3 or raid5 plus one hot-spare, giving you a net capacity of 6 disks, protection against failure of two disks and a sustained transfer rate of around 0.85 x (N - 1) x T = 0.85 x (7 - 1) x 150 = 765 MB/s. My preference is raid3, but you already know that.
The advantage of this setup is you have double protection in case of disk failure, you have a very high transfer rate and it is easy to administer. Using two arrays reduces performance, reduces protection and is somewhat more cumbersome to administer.
thanks so much harm...ah forgot to throw out how much storage i need. but yeah the 6TB is actually probably more than what i need on this system but the space will be there for the future
so im thinking a 1TB drive for OS and progs, then the RAID 3 with the seagates for everything else? i have an extra 120 gig OCZ agility 3 SSD laying around any way to import that into this?
also can the areca 1220 spit out 765mb/s? looking at the tomshardware raid 0 article, i was hoping to average around 200 mb/s read/write. i figure that would be good enough till i move up to 2k & 4k stuff
Keep in mind that Tom's info is very dated, using pretty slow Samsung T166 320 GB disks, that may not have achieved anything more than 60 -70 Mb/s transfer rates.
looking at 2 different seagate drives:
Seagate Constellation ES.3 ST1000NM0033 1TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive
Seagate Constellation ES ST1000NM0011 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive
look pretty much like the same drive except for double the cache on that top one and its cheaper for some reason. more cache hurt or help in my raid array?
The Constellation ES.3 is the latest and newest disk, it is the successor of the ES. The extra cache is always welcome.
ok finally got my disks organized and gonna build my raid 3 soon. whats the normal stripe and then cluster size people using around here? once again harm's probably the expert on this