Some Raid Questions

[mn072065]

I want to change my PC hardrives. I want to buy 4 150GB 10RPM WD Hard drives. I want for the win 64 OS to set up Raid 0 and make both hardrives one. I know this will make it 300GB drives but will it also double the RPMS to 20RPM's? Also I want to make the other two drives Raid 1 for data and have them be backing up each other. Question here is can I have two drives as Raid 0 and the other 2 drives as Raid 1? Thanks for any help.

My Computer

3.2 Dual Core
4GB memory
Win XP64

[Bjs]

After reading that message I am sure most user's brains lost power just from the thought .

Having two drives connected on same channel dosent :

1: Double the capacity
2: Dose not double the speed .

From the manual of my new system :

2 ide connectors (ide1 , ide2) with udma 33/ata , 66/ata , 100/ata , 133/ata support , allowing connect of four ide devices .

2 sata connectors (sata1 , sata2) allowing connection of 2 sata devices .
Support data stripping (raid0) , mirroring (raid1) for serial ata

From this it can be seen that only 2 may be connected .

Being that you asked about four hard drives ... you will also have optical unit/s installed ... your going to need a psu with above output of 500watts just to keep the juice up to it .

Having drives backup to the other residing on the same channel is just adding a system bottle neck .

[mn072065]

thanks for the update. I thought it sounded too good. I'm a newbie. But I was told that Raid 0 doubles your capacity, thought it doubled your RPM's. I guess they did not know what they were saying. And this person really sounded confincing. Anyway thanks.

[Cornucopia]

Just so you're not confused:

1. Raid0 can be pairs or quads (depending upon controller support)
2. Raid0 WILL give you a logical drive equivalent to ~double the size of each drive in a pair (or ~quadruple if using 4). These can be partitioned as a larger drive, or as multiple small or regular size drives.
3. Raid0 will ALSO crank up your available read/write throughput (close, but not all the way to double).

BTW, those hi speed Seagate and WD drives are probably 10,000RPM, not 10RPM. But it's not exactly/solely the RPM that determines the throughput, so it wouldn't be correct to say that your "doubling" the RPM.

Note: the other common Raid types are spanning (like appending) and mirroring (like backup). Spanning is really only useful when you must keep the # of mounted volumes to a minimum--not such a big requirement any more. Mirroring does take a very minor performance hit, but otherwise is totally innocuous.

Don't know if your system can do Raid well or not, but there's nothing that I've seen that says you can't mix and match your Raid types (as long as you've got the drives, controllers/channels, and power).

Scott

[edDV]

Shudder the thought.

We need to know how you intend to use this dragster. Certainly not to commute to work.

You seem influenced by gamer system thought. They see the OS as a boot problem and want only to get the game loaded. For the rest of us, putting the OS on a RAID zero is like tossing the backup parachute because it makes you look fat.

For the kinds of apps we run here, RAID zero is not needed. RAID 1 is a nice luxury but our files are very large. Win 64 limits your choice of drivers and has no current advantage.

Even Raptors look silly to us because we have enough speed but need more capacity.

[rallynavvie]

Indeed, and what would utilize all that memory? Seems like you could save a little by cutting that amount in half and spending it elsewhere on the system.