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  #1  
Old 06-02-13, 02:41 PM
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RAID for Rookies

New boy Matt joins the OC3D team and his first article is a Raid Guide. He says "It is time to dispel the mystique around the previously perceived 'hardcore' hard-drive setups..."




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  #2  
Old 06-02-13, 03:26 PM
Josh Weston Josh Weston is offline
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A great write-up.
Welcome to the team, Matt.
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Old 06-02-13, 03:41 PM
Spaceboy Spaceboy is offline
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Impressive write-up there

However, as an ex-storage consultant, please permit me to point out a few niggles

Page 2 - Raid 5 : You mention "Instead of the traditional mirroring of stripes"... I believe this should read "striping of mirrors" as you aptly described in the Raid 1+0 section above. Remember that striping of mirrors offers greater redundancy than mirroring of stripes (raid 1+0 is better than 0+1).

Page 2 - Raid 6 : The parity is not mirrored, it should be (in any decent implementation) a completely separate parity generation - this offers extra protection against bad blocks that store Raid-5 parity data during rebuild operations.

Page 3 - Mirroring : This attribute offers substantial performance gains for read operations, but none for write operations.

Page 3 - Raid FAQ 1 : Performance improvements are in-line with hard drives, eg: Raid-0 across 2 SSDs will double the throughput in both read and write operations. While real-life improvements may barely be noticeable, the performance increase is real. Also TRIM is now supported in Raid-1, so I argue that wear-rates are not substantially increased over a single SSD. I do agree it rarely makes financial sense though

Raid FAQ 3 : It is very possible to partition your different size drives and then use software RAID across like-size partitions. Leaving you with free partitions you can use for data storage, with the proviso they have no redundancy. Eg: 2TB + 500gb - partition the 2TB into 1.5TB + .5TB, then RAID across the 500gb partition and the 500gb drive. You can subsequently use the 1.5TB partition as normal.


I fully approve of the work you've put in to this and it is overall very good
I am however anally retentive having done this for a living for a while so I hope you'll take my comments as "constructive criticism" rather than any kind of dig

Keep up the good work!
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Old 06-02-13, 10:35 PM
f00f1ght0r f00f1ght0r is offline
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Thank you kindly folks for the welcome!

Spaceboy - i'm honestly impossible to offend, so don't worry about that. The article was aimed at beginners, so my intention was lay some basic phrases and general understanding in this article, and then 'polish it up' in future advanced articles.
I do bow to your knowledge on this subject though, I am but a Jack of All, Master of None, based on the comparison between our job roles!
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Old 07-02-13, 12:26 AM
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Nice wright up
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Old 07-02-13, 10:17 AM
Diablo Diablo is offline
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Good work, I will agree with the RAID 5 comments - I tried a software/onboard method, and got a 5-6MBps throughput, when I upgraded to a dedicated RAID card (adaptec), that went up to over 200MBps.
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Old 07-02-13, 01:23 PM
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Raid0 on SSD's

Hi, very impressive & informative article, well done Matt, I look forward to the follow ups. If I have understood this correctly (which is doubtful) putting SSD's into Raid0 array has no performance benefits & speeds up degradation? I look forward to anyones opinions/thoughts. Cheers
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Old 07-02-13, 02:36 PM
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Quote:
Originally Posted by ugiboy View Post
Hi, very impressive & informative article, well done Matt, I look forward to the follow ups. If I have understood this correctly (which is doubtful) putting SSD's into Raid0 array has no performance benefits & speeds up degradation? I look forward to anyones opinions/thoughts. Cheers

Yeah you have not got the grasp of it at all..... LOL
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Old 07-02-13, 02:52 PM
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I thought as much lol
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Old 07-02-13, 03:13 PM
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My understanding this review?

Beginner RAID FAQs
Q: Can I use Solid-state drives for a super-fast array?A: Yes and no... SATA3 and PCI-E SSDs are already ridiculously fast - RAIDing them will either present negligible performance improvement (for RAID0), or in the case of the mirroring and parity RAIDs, will greatly increase the wear rate of the SSDs, therefore reducing their lifespan. So it *is* possible, but it does not make financial sense in my honest opinion!


Tom, I have taken this from the FAQ section of the review. So can you explain what i have not grasped please. Cheers
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