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Homebrew NAS... Why not use RAID on the mobo?

post #1 of 8
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Quick question for anyone who has played with NASs before... Every DIY guide i check has a RAID controller spec'd out. Is it not advisable to use the RAID on a mobo?

I would like to use something cheap and dirty, like: http://www.newegg.com/Product/Produc...82E16813131613
    
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post #2 of 8
It's do able. But most people tend to like the reliability of hardware RAID.
post #3 of 8
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Quote:
Originally Posted by mbudden View Post
It's do able. But most people tend to like the reliability of hardware RAID.
If I were to pursue a motherboard RAID setup, and the *motherboard* were to die on me, would I be able to recover the RAID array by moving the drives to a new motherboard?
    
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post #4 of 8
It's not about when the motherboard dies - it's the fact that RAID5 using onboard-type controllers have a habit of dying all on their own.

If you value your data, using software RAID under *nix, use mirroring as supported by WHS or Amahi, or buy a hardware controller.
post #5 of 8
Thread Starter 
Quote:
Originally Posted by the_beast View Post
It's not about when the motherboard dies - it's the fact that RAID5 using onboard-type controllers have a habit of dying all on their own.

If you value your data, using software RAID under *nix, use mirroring as supported by WHS or Amahi, or buy a hardware controller.
That's great feedback. Thanks!
    
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post #6 of 8
Quote:
Originally Posted by chazbrazil View Post
Quick question for anyone who has played with NASs before... Every DIY guide i check has a RAID controller spec'd out. Is it not advisable to use the RAID on a mobo?

I would like to use something cheap and dirty, like: http://www.newegg.com/Product/Produc...82E16813131613
I'm no expert on RAID- but from what I've read:

If the raid controller fails - the same type needs to be used.
Add-in card failing= Same type card as a replacement.
Motherboard fails= Best bet would be same board so it's a wash between add-in card /motherboard.
Add-in card= more options= probably more robust.

The issue I can see being a problem is migrating raid array to a different MB, with external add-in card I assume it would be a case of swapping cards from old mb to new and you're go to go. (Assuming you have NAS OS on it's own drive/flashcard)

In either case- have a spare MB on hand- OR spare Add-in card.

Quote:
Originally Posted by chazbrazil View Post
If I were to pursue a motherboard RAID setup, and the *motherboard* were to die on me, would I be able to recover the RAID array by moving the drives to a new motherboard?
If MB has same controller- Assuming you've installed NAS OS to flash drive /dedicated hd for OS it should be doable.


Have you checked out unRAID ????

Lime-Technology offers both pre-built systems and DIY options.

Assemble a custom Media Server with up to 38TB of protected storage!
Unregistered unRAID Server supports up to 3 hard drives.
(It's FREE for (3) drives..)
http://www.lime-technology.com/download

You install unRaid to flash drive installed internally, OR run it off a USB stick, (1) drive is parity drive and you can add hds as needed.... (Regular raid all the drives should be the same capacity /type) Note that unlike a regular raid setup that you can mix and match drives.... you can ADD storage space EASILY without rebuilding entire array.

If I'm reading about unRAID correctly... You can lose the parity drive and be OK, if you lose a 2nd drive before parity drive is rebuilt you only lose that 2nd drive.... NOT THE WHOLE ARRAY... as you would with a conventional RAID array.

(Additionally files are "viewable" in any OS if removed from the array as data is not "stripped' across drives.)

(Regarding losing the parity drive- I would assume you can RAID 1 the parity drive - )

*For speed issues from parity drive being updated when new data is written to array you can install a temp drive that data is temporarily written to- later during "off-peak" times new incoming data is written to array, and parity drive is updated


http://www.lime-technology.com/home/...ystem-builders

http://www.lime-technology.com/wiki/...le=UnRAID_Wiki
Edited by WeAreNotAlone - 1/10/11 at 6:17pm
post #7 of 8
software raid-5 has alot of cpu overhead and the performance is very meh... which is why people prefer hardware raid controller w/ their own processor... these is a huge dell perc controller thread around here that has a ton of good information.

performance and reliability-wise, a good raid controller is the only way to go if your serious about it, if you dont want to spent the cash (used perc5i and perc6 card can be found cheap on ebay) your probably just better off going jbod and backing up or raid1
    
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post #8 of 8
Quote:
Originally Posted by rmp459 View Post
software raid-5 has alot of cpu overhead and the performance is very meh... which is why people prefer hardware raid controller w/ their own processor... these is a huge dell perc controller thread around here that has a ton of good information.

performance and reliability-wise, a good raid controller is the only way to go if your serious about it, if you dont want to spent the cash (used perc5i and perc6 card can be found cheap on ebay) your probably just better off going jbod and backing up or raid1
Software RAID done properly has the potential when set up correctly to be much faster than any hardware card can ever be, and is rock solid stable with far more tools available for array recovery than you get with any other method.

Don't lump proper (ie not Windows) software RAID together with the fakeRAID you get from motherboards and cheap cards - they are not the same at all.
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