Guide: RAID'ing your hard disks

NickS

New member
Hello everyone. Havn't written a guide in a long time, but, here it goes!! Hope I still got it ;).

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RAID 0 - Performance at the cost of reliability.



RAID 0 is where you take two physical HDD's, and stripe them, making them appear as one virtual HDD. This, while pracitally doubling the performance of your hard drive speed, doubles the change of massive data loss.

With RAID 0, say you copy a file onto your "hard drive."

Say the file has 6 bit's.

Code:
6 Bit's

HDD1 -   HDD2

Bit 1	 Bit 2

Bit 3	 Bit 4

Bit 5	 Bit 6

So if one HDD fails, you loose it ALL.

RAID 1 - Reliability at the cost of performance.

RAID 1 is where you mirror the HDD's. This double's the reliability of your data, while the read & write speed can be the same as one single HDD, or even slower.

Code:
6 Bit's

HDD1 -   HDD2

Bit 1	 Bit 1

Bit 2 	Bit 2

Bit 3 	Bit 3

Bit 4	 Bit 4

Bit 5	 Bit 5

Bit 6	 Bit 6

^^Soz for the shoddy example, but it basically double's everything, so if one HDD fail's, you have all your data on the other. Plug in a new formatted drive and it copy's itself back over :).

RAID 0+1, & RAID 5 - Performance and reliability!

RAID 0+1 involves four HDD's. Two are striped while mirrored, so the data is split and archived on the secondary HDD's!! RAID 5 usually is more cost effective, yet a bit less reliable. It involves three HDD's, and if one fail's, it rebuilds the missing files. Sometimes it works, sometimes it doesn't.

What we're going to be looking at today is how to set up, RAID 0, specifically.

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Setting It Up!!

Everyone's BIOS will be different, that's a given...so read up on it, in your Motherboard Manual/Quick Start Guide. :)

Here's some shot's of my BIOS and how to enable it.

000_2155.jpg


My RAID Menu is in
000_2156.jpg


Integrated Perhipherals

000_2157.jpg


000_2158.jpg


Once it's all enabled, save & exit.

Note, nVRAID access key is F10.

So, if you have an nForce 3 or 4...press F10 like mad at the post screen.

You will come to a menu. It's very self explanitory, just set it all up!!

Here's my shot's.

000_2159.jpg


000_2160.jpg


It should look similar to that when you're finished.

Now, when setting up XP, you will need either your mobo's nVRAID floppy or a CD-ROM that's bootable, that came with the mobo. I know some ASUS mobo's come with bootable CD-Rom's for the RAID Drivers.

Fire up XP setup, make sure the floppy is in when you "press any key to continue."

When you see the screen, like this,

xpdriver.jpg


PRESS F6 LIKE MAD untill something else appears down there.

It will install a few things and then the driver selection will pop up. Refer to your MOBO manual to see what ones you need. :)

Once that's completed, just format the RAID'ed drive like normally, and install xp!!

Make sure to install your nVidia Chipset Drivers ASAP when you get into window's, that should be your #1 priority.

When booting, you may notice this bar.

It load's across the screen. Here's a shot from my computer, when it was just about finished loading.

000_2161.jpg


It takes 2-3 second's, thats it, then it goes to regular XP boot. It only does that when I'm RAID'ed, so I'm guessing it's loading the RAID drivers.

But, now, you're just about done!! It may take a few times for you to get it right, it did for me..just don't give up, it's WELL WORTH IT in the end.

Enjoy your newly kickarse HDD setup!! :cool:
 
I agree except that RAID 0 won't 'truly' double your performance.....or really even close to it... The biggest delay in HDD access time is positioning the actuator and platter inside the harddrive....that's about 80-90% of your delay time...the other 10%-20% of the delay time is the read-write speed. Having two HDD's in RAID 0 will effectively double that read-write speed....but that's a small portion of the total delay time.

Now that being said...I have two WD Raptors in RAID 0. When I went from a 7200RPM to a single 10kRPM Raptor I noticed a HUGE visible speed difference...from single Raptor to 2 in RAID 0....not so much of a visible speed difference.
 
Yeah I noticed a large jump from my old 7200rpm WD when I went to my first Raptor... And also felt a noticable difference in speed once I got my second drive and RAID'd it.

Raptors are the pwnage.
 
My current setup is 1 IDE main disk and 1 IDE backup disk

I don't mirror everything onto the backup, just things like my documents and emails so I have a backup of them - everything else is re-installable.

If I got 2 SATA drives (and I'm talking about when a build a new system) RAIDed them, and used them as the main disk and kept the 1 IDE as the backup, would I notice a performace increase?

Also do the RAID disks have to be exactly the same size, make, model, spin speed etc? Becuase if 1 went in a coulple of years time, you might not be able to find a matching one to pair up with the remaing good one.
 
mr_fishbulb said:
My current setup is 1 IDE main disk and 1 IDE backup disk

I don't mirror everything onto the backup, just things like my documents and emails so I have a backup of them - everything else is re-installable.

If I got 2 SATA drives (and I'm talking about when a build a new system) RAIDed them, and used them as the main disk and kept the 1 IDE as the backup, would I notice a performace increase?

Also do the RAID disks have to be exactly the same size, make, model, spin speed etc? Becuase if 1 went in a coulple of years time, you might not be able to find a matching one to pair up with the remaing good one.

You will feel a HUGE increase in performance... IDE just can't offer up the bandwidth needed for these fast computers anymore, SATA is the only way to fly.

As far as needing the same size disks, it all depends on which RAID method you choose. I believe that RAID 0 is the only type of array that will allow you to use any amount of hard drives in any size (this is because RAID 0 just clumps all of the space together to create one large logical drive). All of the other arrays have some sort of mirroring and data protection system which means that both hard optimally need to be the same speed/size. However from what I've seen you can use a different sized drive in a mirror array, you just get capped to the size of the smallest drive however. (ie. you have an 80gb hd and a 160gb hd, put them in to a mirror array and your new logical drive will only show up as 80 gigs, wasting the remaining 80 gigs on the larger drive).

Someone please correct me if i'm wrong, I'm by no means a RAID guru, I just have my shizzle RAID 0'd and that's the extent of my RAID experience.
 
Well, I just realized that RAID5 only requires three hdd's and what do you know, I just recently got 3 SATA hdd's. My ASUS manual in the RAID area says that this formation is better for business setups. Any idea how well it would work for a gaming setup? Would it be better to RAID0 2 of them for the OS and games and use the extra one for random data or RAID5?

Thanks
 
Does anybody know if you can apply Raid to a HDD with data already on a drive? I've got 2 Identical 160Gb SATA drives, and I recently moved all the data onto one of the drives using Partition Magic.

I took 1 of the drives out to cut power consumption (I've only got a 250w PSU in my Qbic). Now I'm thinking of putting the drive back and setting up RAID.

Thanks,

Damian
 
WC Annihilus said:
Well, I just realized that RAID5 only requires three hdd's and what do you know, I just recently got 3 SATA hdd's. My ASUS manual in the RAID area says that this formation is better for business setups. Any idea how well it would work for a gaming setup? Would it be better to RAID0 2 of them for the OS and games and use the extra one for random data or RAID5?

Thanks

I would recommend RAID 0 for a gaming setup, it's the maximum performance array. And I'd RAID all 3 of them and then partition them in to smaller segments.

@Damian: Sorry mate, the hard drive has to be wiped during the RAID process. Because RAID takes and shares / splits the data amongst the drives (ie. a single file can be stored between both drives). If you're willing to format, go for it! RAID is pwnage x 10.
 
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