RAID

RAID – Redundant Array of Inexpensive / Independent Disks

Info collected from here: http://eshop.macsales.com/shop/hard-drives/sata/RAID_Guide/Learn_About_RAID_5

Great article on RAID:  https://www.prepressure.com/library/technology/raid

and as well as wiki and other sites.

Note: RAID 10 (RAID 1+0) and RAID 01 (RAID 0+1) are different.

RAID 0 (Stripe)

Requires 2 or more drives. Hardware or software RAID can be used to implement.

Advantages:

High speed and we get full capacity

Disadvantages:

No data safety / parity

RAID 0

RAID_0.svg

RAID 1 (Mirror)

RAID_1.svg

RAID 5 (Stripe with parity)

RAID 5 – Data is striped like RAID O. Should have minimum of 3 drives. Parity information is spread on all available drives. Parity information will be as much as a whole single drive.

Advantages:

> Good read performance

> Data redundancy. Data can be recovered in case of a drive crash on a drive.

RAID 5 storage

RAID 5 Parity

raid-level-5-striping-with-parity

RAID 6

RAID 6 is similar to RAID 5 except it has dual parity.

raid-level-6-striping-with-dual-parity

RAID 10

Combination of RAID 0 and RAID 1. Which means both striping and mirroring. There are no parity in RAID 10.

If RAID 5 requires 3 HDDs then RAID 10 requires 4 HDDs.

RAID_10

RAID 0+1 vs RAID 10

RAID10ExampleImage.jpg

There are also RAID 50, 60 and 100. Check Wikipedia.

https://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_10_.28RAID_1.2B0.29

RAID-DP

Netapp (such as FAS3220) uses RAID called RAID-DP. It uses Netapp’s variant of RAID 6 with dual parity with hot spare HDDs. As a result,  as soon as disk get fails, spare HDD is automatically replaced by the controller.

NetAPP FAS3220 controller and HDDs in RAID-DP

badal-storage

 

raid-usable-capacities

RAID comparison

raid-comparo

raid-comparo-2

This one I downloaded from net

raid-pros-and-cons


Configure RAID 0 (Striping) on Dell Power Edge R710

The server has 5 HDDs and we are going to configure them in RAID 0 striping.

  1. Reboot the server and press Ctrl + R
  2. Note: this is via iDRAC

————–

Process:

Reboot the server -> Ctrl + R -> Clear the existing RAID configuration (if any) -> Create new RAID configuration (Here we set RAID level) -> Check / select the HDDs -> Give RAID name -> Initialize Disks -> Ctrl + N  to goto next page.

————–

raid-1

3. Place cursor in Controller 0 and Press F2. F2 – Operations

4. Select clear config

raid-2

5. Select yes and clear configuration

raid-3

raid-4

Now place cursor in Controller 0 and press F2

6. Clear Foreign config if it is available. If greyed out like below proceed to step 7. raid-5

7. Again press F2 operations

8. Select Create New VD

raid-6

9. Here we have 5 HDDs and we are going to configure in RAID 0 configuration. Here make sure the HDDs available in the server are listed here.

raid-7

10. Press Tab to place cursor in the HDD and select space bar in the keyboard to select the drives. Make sure the HDDs are checked. Checked HDDs appear “X” as shown below.

raid-8

11. Give a name to this configuration. VD0 and select Ok.

raid-9

12. Now you will be taken back to the main screen

raid-10

13. Now we need to initialize the disk

raid-11

14. Fast initialization is selected

raid-12

15. Now goto next page by pressing Ctrl + N

raid-13

16. Again press Ctrl + N

raid-14

17. Press Ctrl + N and you will be taken to the main screen

18. Press ESC

raid-15

19. To reboot, in the Menu -> Marcos -> Select Ctrl + alt + delete


 

HP iLo configuration (iLO – Integrated Lights-out)

Restart HP server -> Press F8 to load iLO configuration

Configuring iLO is straight forward, just goto Network settings and uncheck DHCP and enter static IP address.

 

 

 

 

 

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