RAID Arrays, and what they mean.

Dev67 · 02-15-2004, 04:24 PM

RAID Q.
Do the Disks have to be identical for RAID 0?
Because I Partitioned one of my 80gb WD 8mb cache. The other one is not partitioned...can I still run RAID 0?

02-15-2004, 04:59 PM

Quote:

Originally Posted by Dev67

RAID Q.
Do the Disks have to be identical for RAID 0?
Because I Partitioned one of my 80gb WD 8mb cache. The other one is not partitioned...can I still run RAID 0?

they have to be identicle and u will have to reformat i think

Quote:

When using more than one HD in a RAID config give you more HD space or just make it faster? For Ex: 2 Raptors would be twice the space? Or am I getting the hole thought of it mixed up?

depends on the raid...raid 0 makes u go faster...raid 1 gives u redendancy(just in case someone comes in a beats the crap out of 1 hdd u still got the other) and many other raids

Quote:

what about RAID 0+1?

raid 0+1 requires 4 hard drives...2 hard drives strip inorder to double the speed of reading/writing while the other 2 hard drives mirror them to make some redundancy

Quote:

How does RAID 1.5 work?

2 hard drives are required.... when writing stuff unto them they write the same data twice on both drives....when reading them they get half the data from both sides...the effect is it is redundant and when reading it will go twice as fast

Quote:

There is really no such thing as RAID 1.5... it is sort of like slang... what they are referring to is RAID 15 which is using two RAID5 stripes that are mirrored to each other. Usually each stripe is on a seperate controller as this option offers reduncancy to a possible Array Controller failure.

lies!

edit: u guys asked the same questions about 50 times....read the thread

Dev67 · 02-15-2004, 06:09 PM

Quote:

Originally Posted by AZNmodder

they have to be identicle and u will have to reformat i think

ok, so i need to resize my partition then...dang.
How hard would it be to get them exact?

Darkeagle · 02-15-2004, 06:19 PM

What about 2 HD's. exact same specs, but different manufacturer's?

Or do they need to be the same maker too?

kewldude606 · 02-15-2004, 06:35 PM

Quote:

Originally Posted by Darkeagle

What about 2 HD's. exact same specs, but different manufacturer's?

Or do they need to be the same maker too?

That will work, just double check that the formatted size is the same on both drives.

Now for my question:
How/is it possible to have a 36GB raptor and a 36GB slower drive in RAID 1? So the computer mainly uses the raptor and the other drive is playing catch up most of the time, but you still have it as a backup?

vsop · 02-15-2004, 06:52 PM

Quote:

Originally Posted by AZNmodder

depends on the raid...raid 0 makes u go faster...raid 1 gives u redendancy(just in case someone comes in a beats the crap out of 1 hdd u still got the other) and many other raids

There is actually one misconception about raid 0 & raid 1..

Raid 0 allows writing to the drives much faster, and read speed does not jump as much..

Raid 1 on the other hand is not only used becuase of the backup drive, but also because a true raid 1 has two seperate channels for each drive.. So that when accessing data your speed increases greatly.. because you have two identical drives to read from so your access time drops and you can read seperate parts of the drive at the same time.. Which is why its so great for servers..

There is also one raid that was not posted at all.. Its rare because of the cost, but used in very high end setups.. RAID 50, a raid 5 array with stripping.. Its the best of raid technology but your looking at $$$$

02-15-2004, 07:14 PM

Quote:

Originally Posted by vsop

There is actually one misconception about raid 0 & raid 1..

Raid 0 allows writing to the drives much faster, and read speed does not jump as much..

Raid 1 on the other hand is not only used becuase of the backup drive, but also because a true raid 1 has two seperate channels for each drive.. So that when accessing data your speed increases greatly.. because you have two identical drives to read from so your access time drops and you can read seperate parts of the drive at the same time.. Which is why its so great for servers..

There is also one raid that was not posted at all.. Its rare because of the cost, but used in very high end setups.. RAID 50, a raid 5 array with stripping.. Its the best of raid technology but your looking at $$$$

yea ur right...and i knew it i just wasnt thinking : /

Dev67 · 02-22-2004, 11:30 PM

Quote:

Originally Posted by vsop

There is actually one misconception about raid 0 & raid 1..
Raid 0 allows writing to the drives much faster, and read speed does not jump as much..

Yes, I did notice this on my new setup. Installing misc. stuff is very fast, saving files, etc...

but loading bf 1942 maps isn't uber fast as I'd hoped.

Blazin Trav · 04-06-2004, 02:59 AM

Quote:

Originally Posted by Dev67

Yes, I did notice this on my new setup. Installing misc. stuff is very fast, saving files, etc...

but loading bf 1942 maps isn't uber fast as I'd hoped.

Maybe try SATA in RAID 0? Or try the new RAID types available?

m0l0t0v · 05-04-2004, 03:48 PM

Found an interesting RAID article:

http://www.pcguide.com/ref/hdd/perf/raid/index.htm

vsop · 05-04-2004, 06:33 PM

Quote:

Originally Posted by Blazin Trav

Maybe try SATA in RAID 0? Or try the new RAID types available?

Thats won't help his read speed much...
Best read speed is from raid 1.

Leowjb · 05-16-2004, 09:51 PM

finally an easy to understand RAID FAQ (or whatever you want to call it)

123456789 · 07-19-2004, 11:22 PM

How exactly are these setup? do you simply install a couple hard drives and use software to tell them how to interact or is extra hardware required to link the drives?

hiei · 07-19-2004, 11:27 PM

wow this is old

u instal with a mobo that supports a raid configuration or a raid card that allows a raid setup (these are pci cards)

i thaught there were more types of raid then that tho

Opiate · 07-19-2004, 11:46 PM

Quote:

Originally Posted by 123456789

How exactly are these setup? do you simply install a couple hard drives and use software to tell them how to interact or is extra hardware required to link the drives?

Software RAID is rare but not unheard of. Heres a guide.

http://linas.org/linux/Software-RAID/Software-RAID.html

Nice name.

123456789 · 07-19-2004, 11:54 PM

I have read of RAID 2 and RAID 4 but from what I understand they are pretty much useless.

TheHumbleLobster · 07-20-2004, 12:16 AM

Opiate you beat me to it on the software RAID

123456789: Most RAID configurations are usefull for some purpose, although some of the weirder ones are only for industrial use.

vsop · 07-20-2004, 12:22 AM

Windows 2000 and 2003 server also have built in support for Software raid and JBOD..
Software raid is fine for just doing a simple HD mirror, but You should always use seperate device channels so that if a controller channel dies the other one is still up and working.. I have done this with older systems that did not have built in raid controllers.

If you are in it for a performance increase as well as data redundancy then a raid controller is a must

Sinning · 08-06-2004, 04:47 PM

Here is a site I found when I was looking into RAID's if anyone is interested in seeing every level of RAID including those that you'll probably never see.

http://www.acnc.com/04_01_00.html

CtrlAltDelete · 12-06-2004, 09:46 PM

Quote:

Originally Posted by ltmanx

An interesting tidbit of information . . .

RAID originally was called Redundant Array of INEXPENSIVE Disks.

The name has since changed. (I got this information from a copy of CDW's monthly magazine for business users.)

I can tell you its referred to as Inexpensive disks on A+ exam :)