I have a 3 drive WD Raptor 300GB in RAID 0 for speed. I am using an areca ARC-1210 PCI-Express x8 SATA II (3.0Gb/s) Controller Card. One of the drives failed. I removed the drive and rebuilt the raid Raid on 2 drives. I could tell the difference between 2 and 3 drives.
All 3 of the WD drives are SATA III. The card seems to be SATA II.
I called WD and complained. They sent me an RMA. While at work i thought 4 drives in RAID 0 must be even faster so I looked at the Model number on the WD RMA email and ordered a 4th drive.
I got the RMA and the new drive today. Guess what. The RMA and new drive are SATA 6. So now i have a delima. I have 2 SATA III drives AND 2 SATA 6 drives.
My raid card appears to be SATA II.
I am looking for performance. I want speed. Can all 4 of these drives live in raid 0 ok? will the faster ones drop down? Should I buy2 more SATA 6 drives? Should I look for a new raid card? I was told this card was very good and much better the then on board cards for ASUS Rampage III mobo and the MSI Eclipse SLI mobo. SO I dished out $300 for it.
I am looking for FAST boot times. FAST decompression of very large files and FAS compression of very large files. I do a lot of video rendering as well.
Again, they are not sata 6, they are sata 3 (6Gb/s), it says "sata 6.0GB/s" in the specs and on the box. All 4 of your drives are sata 3. The only difference is the new drives are the newer version with more cache as they don't make the old version anymore. And you can raid hdds with different amounts of cache.
Since the raid controller is sata 2, all drives will work at sata 2 speeds (3Gb/s each) so you are nowhere near the max. Sata 2 or 3 does not matter on a mechanical hdd as they can't fully saturate sata 2.
If speed is an issue, ssds would have been better if less space is not an issue.
I see what you are saying now. Kinda took some research on another thread and your thread combined for me to understand this.
RECAP of what i have learned....
SATA 1 = 1.5Gb/s
SATA 2 = 3Gb/s
SATA 3 = 6Gb/s
SATA 3 = SATA 6 when it comes to naming conventions there is confusion as 3 refers to the version and the 6 refers to the transfer rate. (this was my issue with WD tech on the phone)
My Drives are all 4 SATA III... 2 have more cache then the others. But that should not be an issue and all 4 are compatible to go into a RAID 0 environment.
SSD seem to not be to swift on anything below SATA 3.
Mechanical drives on/using SATA III are for marketing only, because max speed what mechanical drives can achieve is about 150MB/s. (info from another web site??)
SO.... Keeping my hardware as is may be best... though I'm still grey on the 3 drive vs 4 drive situation. Reason I say this ( did read your post) is because I could personally see a difference in large file extraction when i dropped to 2 drives from 3. I could tell a difference in performance and extraction time.
Going with what you say K1114, if 2 drives in raid 0 is max on speed for WD Raptor 10RPM drives.... then perhaps Raid 0+1 would be in order here....seems i have 4 of these drives....redundancy.
I have also learned....and I am still clarifying, that 1 single SSD SATA III will be a "hella" lot faster then my raid 0 Drive set up....
Perhaps I should do as suggested and buy a single SSD in SATA III and connect it to the SATA III header on my mobo for system drive.....
BUT this now begs the question.... Ho much faster is SSD SATA III 2x drives in RAID 0 compared to 1?
A guy at work said that there is no change and it is not worth it.
Wow ok just something to look into there are SSD drives (Single no raid involved) That can do 500MB a sec and will destroy your 4 disk setup. I know this as i had a 5 disk raid 0 and i liked it but replaced with just a sata 2 ssd and it destroyed my raid speeds boot time cut in half literally 15 seconds. Office 2010 word and excel open in 1 second outlook in 3 seconds just insane. less power less noise winner all around.
I've never heard someone call it sata 6 unless they didn't know what they were talking about. I've heard sata 6gigabits which is fine imo but not sata 6, that implies version 6, which it is not.
Reviews of your velocs say it averages 90mb/s and bursts around 150mb/s and in theory each additional hdd should raise that amount so 4x90=360mb/s (600mb/s bursts) But this isn't a perfect world so will be less than that.
The main benefit of a ssd is access times, which is about .15ms vs the velocs 7ms. The advertised speeds of ssds are for when it's new. After you use it for awhile it'll be just a bit lower. But it should still be able to match or beat raid 0, and with the much lower access times it'll be much quicker.