RAID Implementation

By chrismuiruri ·
I have a HP Proliant 370 i want to deploy a RAID system.Which is the best RAID to implement. The server i want to implement is the domain controller.

What are the steps involved in implementing RAID system.

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The best RAID?

by LiamE In reply to RAID Implementation

Which is the best RAID to implement depends on a) what you have b) what you want it to do.

Okay here goes with raid 101.

RAID stands for redundant array of inexpensive disks.

In simple terms its a way of getting multiple HDD's to work together to provide fault tolerance, more speed or a mix of both.

The most common raid "levels" (ie configuration) are 0,1 and 5.

Raid 0 requires 2 or more disks and provides extra speed - it is often know as a stripe set. Data is broken into chunks and written across multiple disks so as to aggregate their preformance. Lets say it takes 1 second to write 1Mb to a single disk - raid 0 with 2 disks will write half the data to each of the disks and so do it in half the time. Reading back is the same in reverse - it reads from both disks at the same time and so is much faster than a single disk. Sounds good so far.... except if one disk fails you lose everything. this is rarely recommended for important systems.

Raid 1 is mirorring. Whatever is written to one disk is written to another... if one fails the other just takes over as you had 2 copies - most users wouldnt even know there has been a failure. The broken disk can be replaced and the mirror "rebuilt" and you are back ready for another disk failure whenever that might happen. This is good for important data, but the downside is the cost - you need to double up on the number of disks you would otherwise have needed.

Raid 5 tries to get the best of both worlds - improve speed and be fault tolerant. It requires 3 or more disks. Like raid 0 it reads and writes across several disks at once to provide the extra speed... but saves the last disk to save parity information to get your data back if one disk fails. Whether there are 3 or ten disks in the set only one disk is not available to store data on, so its far more efficient cost wise than raid 1 while being nearly as fast as raid 0. The downsides here are that if a disk fails the otehr wil slow down, sometimes really badly, and if 2 disks fail, you have lost the data.

So the steps involved - look at what you have including how many HDD's. Look at what the server is used for - a domain controller needs to be both reliable and fast. Find out if it came with a raid controller if not buy one and any extra disks you need. Install the HDD's and card if necessary. Boot the server and look at the bios messages... it will tell you how to get into the RAID bios... most like by pressing ctrl+a, though it might be ctrl+h or something else entirely. Use the raid bios to create your raid set. Then you can install your OS as normal. Bear in mind though that even if you have 10 disks in a raid set the OS will see tham as one. This is normal. To see the raid setup later the controller manufacturer will supply an application to run in Windows (or Linux, Unix etc) which you will need to install.

Good luck.

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Raid !!

by kgr1gr In reply to RAID Implementation

if is just a domain controller a mirroring its ok!
i you want also to work on this server not only as domain controller ,and other applications like SQL or file server i thing that the best way is .2 disks mirroring for the OS ,and 3 more disks at least Raid 5 mode for the data bases or file sharing and one disk to be stand by Hot spare non spinning .that means in case of mirroring you need 2 disks and one spear ,in case that you want and Raid 5 you need 6 disks or 7 .

i assume that you have allready Hot Blug Array controller !!!

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