use old raptor drives in new build or get rid of 'em?
So, on my old build, I had two Western Digital 740GD Raptor drives in a RAID 0 config. My parts for my new build arrive today, and I ordered a new Western Digital Caviar SE16 640GB drive. I know my raptors were SATA1 and 8mb cache, and this new drive is SATA2 and 16mb cache, but is the combo of two raptors in RAID 0 just too good to discard? On my new build, should I put my OS on the raptors in RAID 0, and just use the 640 mb drive as a storage drive?Or should I just get rid of the raptors? I guess I just don't know if the improvements in the drive technology are such that the new drive will peform better than the old raptors in raid0.
The Raptors will almost surely perform better than the Caviar. Here is a direct comparison showing that even a single Raptor WD750GD outperforms the Caviar: http://techreport.com/articles.x/8497/6
Hope this helps!
Sweet baby jesus, I feel like I've been researching drive comparisons and raid 0 cluster/stripe sizes forever. The first thing I'll say is that I'm not even sure that the 740GD drives in RAID 0 for an OS drive are even preferable. I did see a comparison between the 640 GB Caviar and the 2nd generation 74GB raptor with the 16MB cache in RAID0, and the Raptor RAID was barely beating the 640gb caviar, and that was the 16MB raptor. Also, came across some information saying something about striping not being equally lined up between the 2 drives when used as a OS drive.
But that aside, There are soooooo many different opinions about what size to make cluster/striping size. It kind of seems like you would want the 4k cluster/16k striping for an OS RAID0 setup, and maybe a 16k cluster for storage drive(though not sure if 16k cluster causes defrag problems), but you also find people suggesting 64k striping or 128 k striping
So, to sum up the questions I still have:
What is this deal about an OS raid drive not having striping equally "lined up" on both drives somehow? I wish I could remember the term they used for it. Something about a boot partition being created on one drive that throws it off and needing to use really big striping to fix it, otherwise losing 20% or so performance.
Also, I know that ideal stripe size can sometimes depend on the controller(I have a gigabyte GA-EP35-DS3R so the southbridge SATA and the 2 gigabyte SATA), but for an OS RAID0 config is 4k cluster and 16k striping the way to go?
The ONLY reason I have done away with my 74 GB Raptors in RAID 0 on my rig is that I replaced them with the new 300 GB VelociRaptor. It all depends on what your needs are. You could keep them and add something like the WD6400AAKS as a data drive and probably survive another few years...or if you want speed...the new VelociRaptor is a bit faster as a sngle drive than my old 74 GB Raptors in RAID...by about 20%. You are in a win win scenario...
A RAID controller adds latency to the drive so it might kill part of the Raptor's edge. Raptor's strength is random access time, not bulk transfer, by putting them in RAID you might negate it's strength to compensate for its not-that-annoying shortcoming, ending-up with an overpriced storage geared toward sequential read/write performance.
Maybe you could just use them in non-RAID mode and get a second disk better at bulk storage.
Perhaps...but not significantly...see here:
Overall...you lose about 4% on the access time...going from 7.0 to 7.3 ms. RAID still has benefits...